4 MORE ABOUT SOLIDS, LIQUIDS AND GASES
|
|
- Marcus Lamb
- 7 years ago
- Views:
Transcription
1 4 MORE ABOUT SOLIDS, LIQUIDS AND GASES I. Tick ( ) the most appropriate answer. 1. The fluid used in aneroid barometer is: (a) water (b) mercury (c) air (d) none of these 2. The normal atmospheric pressure is: (a) 70 cm of mercury (b) 76 cm of mercury (c) 67 cm of mercury (d) 80 cm of mercury 3. The intermolecular spaces in case of liquids is: (a) less than solids (b) more than gases (c) more than solids (d) more than solids and gases 4. The kinetic energy of molecules of a gas increases with: (a) fall in temperature (b) rise in temperature (c) decrease in pressure (d) increase in pressure 5. The pressure exerted at any point on an enclosed liquid is transmitted: (a) only towards the sides of vessel (b) only towards the base of vessel (c) in all directions of the vessel (d) none of these 6. When a body is fully immersed in liquid, the apparent loss in the weight of the body is equal to: (a) volume of liquid displaced by body (b) density of the liquid (c) weight of liquid displaced by body (d) none of these 7. When an ink fountain pen leaks on high altitude: (a) pressure of atmosphere is more than pressure inside the pen (b) pressure of atmosphere is less than pressure inside the pen (c) the density of ink on high altitude decreases (d) none of these 8. When the weight of a given body is less than weight of fluid displaced by it, then the body: 1
2 (a) sinks (b) floats (c) just keeps in line with the surface of fluid (d) none of these 9. Buoyant force exerted by a fluid on a given body is: (a) equal to the volume of body (b) equal to the weight of body (c) equal to the volume of fluid displaced by body (b) equal to the weight of fluid displaced by the body 10. Heat is transmitted in liquids by: (a) conduction (b) convection (c) both conduction and convection (d) none of these 11. A device to measure the liquid pressure is: (a) barometer (b) thermometer (c) manometer (d) lactometer 12. The liquid used in a simple barometer is: (a) water (b) alcohol (c) mercury (d) kerosene 13. Liquid pressure with increasing depth: (a) decreases (b) remains the same (c) increases (d) none of these 14. The pressure exerted at any point on an enclosed liquid is transmitted: (a) only at the bottom (b) only on the sides (c) in all directions (d) none of these 15. Buoyant force experienced by a body partly or wholly immersed in a fluid is called: (a) upward force (b) horizontal force (c) downward force (d) none of these 16. Buoyant force exerted by a fluid on a body is equal to the (a) weight of the body: (b) apparent loss of weight of the body (c) mass of the body (d) none of these 2
3 17. If the weight of the body is more than the weight of fluid displaced by it, then the body: (a) float (b) first floats and then sinks (c) sinks (d) none of these Ans. 1. (d) 2. (b) 3. (c) 4. (b) 5. (c) 6. (c) 7. (b) 8. (b) 9. (d) 10. (b) 11. (c) 12. (c) 13. (c) 14. (c) 15. (a) 16. (b) 17. (c) II. Fill in the blanks. 1. Kinetic energy of the molecules with the increase in temperature. 2. With the increase in the intermolecular forces decrease. 3. The Phenomenon due to which exposed surface of a liquid behaves like stretched membrane is called. 4. Mercury forms spherical droplets, because it has no force of with glass surface. 5. The meniscus formed by water in a test tube is of shape. 6. With the increase in the volume of an enclosed gas, its pressure. 7. Convection in liquids takes place due to of its molecules. 8. The pressure in liquids is independent of of vessel. 9. The atmospheric pressure at sea level is 100, When a solid floats in a liquid, then the weight of whole is equal to the weight of liquid displaced by its immersed part. 11. All matter is made up of. 12. Molecules of the same type each other. 13. A liquid droplet is in the shape of a. 14. When a substance is heated, the kinetic energy of the molecules. 15. When a gas is allowed to expand at a constant temperature its pressure. 3
4 16. Liquid pressure does not depend upon. 17. For an object floating in water, its apparent loss of weight will be buoyant force. 18. The atmospheric pressure at sea level is mm Hg. 19. Liquid pressure remains the in all directions at a given depth. 20. Pressure exerted by the liquids on the sides of the containing vessel is called. 21. At high altitudes, the atmospheric pressure. 22. The force of attraction between the molecules of different substances is called force. 23. The force of attraction between molecules of the same substance is called. 24. If the weight of a body is equal to the buoyant force, it will in the fluid. 25. A submarine can sink or rise up by filling or emptying its. 26. A brick feels in water than in air. 27. An iceberg is considered dangerous because it floats with only of its volume above water. 28. Buoyant force is equal to the loss of of the body when it is immersed in a fluid. 29. The upward force exerted by a liquid on an object immersed in it, is called. 30. Mass per unit is called the. 31. Larger the volume of a body immersed in a liquid the is the upthrust. 32. When the weight of a body is less than the weight of the liquid displaced by it, the body will. 33. When the weight of a body is greater than the weight of the liquid displaced by it, the body will. Ans. 1. increases 2. intermolecular spaces 3. surface tension 4. adhesion 5. concave 6. decreases 7. motion 8. area of cross-section 9. Pascals 4
5 10. soild 11. molecules 12. attract 13. sphere 14. increases 15. decreases 16. shape of the vessel 17. equal to same 20. lateral pressure 21. decreases 22. adhesion 23. cohesion 24. float 25. ballast tanks 26. lighter 27. a part 28. weight 29. upthrust 30. volume, density 31. greater 32. float 33. sink III. The statements given below are incorrect, write the correct statements. 1. When a solid floats in a liquid then the density of solid is always more than the density of liquid. Ans. When a solid floats in a liquid then the density of solid is always less than the density of liquid. 2. When the tube of a barometer is tilted, it records a different atmospheric pressure. Ans. When the tube of a barometer is tilted, it records the same atmospheric pressure. 3. Molecule is the smallest unit of matter, which may or may not have an independent existence, but always takes part in a chemical reaction. Ans. An atom is the smallest unit of matter, which may or may not have an independent existence, but always takes part in a chemical reaction. 4. Meniscus is formed in the liquids due to the force of gravity. Ans. Meniscus is formed in the liquids due to the strong force of cohesion. 5. Buoyant force of a liquid increases with the decrease in the density of liquid. Ans. Buoyant force of a liquid increases with the increase in the density of liquid. 6. The pressure of an enclosed gas increases with the increase in the volume of gas. Ans. The pressure of an enclosed gas decreases with the increases in the volume of gas. 7. Liquids exert same pressure in all directions at different depths. 5
6 Ans. Liquids exert same pressure in all directions at same depths. 8. Moisture in mercury increases the barometric height. Ans. Moisture in mercury decreases the barometric height. 9. When a solid is completely immersed in a fluid, then the apparent loss of weight of solid is more than the weight of fluid displaced. Ans. When a solid is completely immersed in a fluid, then the apparent loss of weight of solid is equal to volume of fluid displaced. 10. Solids can be compressed because the molecules are arranged close together. Ans. Solids cannot be compressed because the molecules are arranged close together. 11. The relation between the upthrust and the weight of the liquid displaced by a submerged object was first discovered by a Greek mathematician and scientist named Aristotle. Ans. The relation between the upthrust and the weight of the liquid displaced by a submerged object was first discovered by a Greek philospher and scientist named Archimedes. 12. Objects appear heavier when kept immersed in a fluid. Ans. Objects appear lighter when kept immersed in a fluid. 13. Buoyant force is experienced only when objects are immersed in liquids and not in gases. Ans. Buoyant force is experienced when objects are immersed in liquids and gases both. 14. Buoyant force acts in all directions. Ans. Buoyant force acts in upward direction. 15. The barometer reading changes for different positions at the same depth. Ans. The barometer reading is same for different positions at the same depth. 16. Atmospheric pressure increases as we move from sea level to higher altitude. Ans. Atmospheric pressure decreases as we move from sea level to higher altitude. 6
7 17. Conduction takes place due to molecular movement. Ans. Conduction takes place due to molecular vibration. 18. With the decrease in intermolecular space, the intermolecular forces decrease. Ans. With the decrease in intermolecular space, the intermolecular forces increase. 19. Aneroid barometer used pure mercury. Ans. Aneroid barometer uses no liquid. 20. With the decrease in the volume of gas its pressure decreases. Ans. With the decrease in the volume of gas its pressure increases. IV. Name the following. 1. The scientist who first proposed that molecules are constantly moving. 2. The force between the molecules of two different types of substances. 3. The state of matter in which it is easily compressible. 4. The curve surface of a liquid column. 5. A mode of heat transference accompanied by the physical movement of molecules. 6. The upward force experienced by an object when immersed in a fluid. 7. The instrument used to measure atmospheric pressure. Ans. 1. Robert Brown 2. Adhesive force 3. Gaseous 4. Meniscus 5. Convection 6. Upthrust 7. Barometer V. Define these terms. 1. Surface tension Ans. Surface tension: The phenomenon due to which exposed (top) surface of a liquid contained in a vessel behaves like a stretched membrane is called surface tension. 2. Cohesion Ans. Cohesion: The force of attraction existing between the molecules of the same type is reduce called the cohesion. 7
8 3. Adhesion Ans. Adhesion: Adhesion is the force of attraction between the molecules of different substances. 4. Atmospheric pressure Ans. Atmospheric pressure: The thrust on the unit area due to the column of air on the earth s surface is called atmospheric pressure. 5. Conduction Ans. Conduction: The process of transfer of heat in solids, from one particle to another without the actual movement of the particle is called conduction. 6. Convection Ans. Convection: The mode of heat transference in liquids and gases, taking place by the actual movement of molecules from one part to another is called convection. 7. Meniscus Ans. Meniscus: The formation of curved surface by the exposed surface of the liquid contained in a narrow vessel is called meniscus. VI. Match the following. 1. Intermolecular force (a) force of attraction between molecules of the substance 2. Cohesion (b) distribution of thrust exerted by a liquid due to its own weight 3. Adhesion (c) force of attraction between molecules 4. Liquid pressure (d) force of attraction between molecules of different substances Ans. 1. (c), 2. (a), 3. (d), 4. (b) VII. Differentiate between the following. 1. Solids and liquids on the basis of arrangement of molecules. Ans. In solids, there is very less space between the molecules and they are tightly packed. So they have a definite shape and definite volume. While in liquids intermolecular space is more than solid and they are less tightly packed. So they have a definite shape but no definite volume. 8
9 2. Conduction and convection. Ans. The mode of transmission of heat energy from one atom to another atom, in the direction of lower temperature without the actual movement of atoms from their mean position is called conduction. It takes place in solids. The phenomenon, due to which particles of a medium actually move towards the source of heat energy, and then on absorbing heat energy move away from it, thereby making a space for other particles of medium to move towards the source of heat is called convection. It takes place in liquids and gases. 3. Liquid pressure and atmospheric pressure. Ans. All liquids apply pressure on the walls and bottom of their container. The force applied by liquid per unit area is called liquid pressure. The force exerted by atmosphere per unit area on the surface of earth is called atmospheric pressure. VIII. Give reasons for the following. 1. Mercury does not wet glass. Ans. The cohesive forces between the molecules of mercury is greater than the adhesive forces between the molecules of mercury and glass. Thus mercury does not wet glass. 2. The sides of an empty can do not collapse inwards. Ans. The atmospheric pressure acts equally in all directions that is why the sides of an empty can are not pushed in as the air pressure inside the can is the same as the air pressure outside. 3. You will be able to lift a heavy object quite easily inside water. Ans. According to Archimedes Principle, when a body is wholly or partially immersed in a fluid, it experiences an upthrust equal to the weight of the fluid displaced by the body. Hence, the object feels much lighter inside water than its actual weights. So we are able to lift a heavy object quite easily in water. 4. If a thermometer is broken, small drops of mercury will roll like little balls. Ans. If a thermometer is broken small drops of mercury roll like little 9
10 balls due to surface tension. 5. A gas can be easily compressed. Ans. The molecules of a gas are very far apart and they have very large intermolecular spaces. So a gas can be easily compressed by applying pressure. 6. Water has a tendency to form spherical droplets. Ans. Water has tendency to form spherical droplets due to surface tension which is mainly caused due to unbalanced cohesive force acting near the top surface of a liquid. 7. Hydrogen-filled balloons tend to float upwards. Ans. Hydrogen is lighter than air, so hydrogen filled balloons tend to float upwards. 8. Giant hot-air balloons rise up. Ans. When air is heated, it gets lighter and tends to rise upward, so giant hot air balloons rise up. 9. A piece of iron floats in mercury but sinks in water. Ans. Density of mercury (13.6 g cm 3 ) is higher than that of water (1 g cm 3 ), thus mercury exerts more upthrust on iron piece. So a piece of iron floats in mercury and sinks in water. 10. A balloon filled with helium gas rises up. Ans. Since, helium gas is lighter than air, so a balloon filled with helium gas rises up. 11. One find easier to swim in sea water as compared to pure swimming pool water. Ans. Since density of sea water is more than pure swimming pool water. So sea water exerts more upthrust on the body, and hence, one find easier to swim in sea water as compared to pure swimming pool water. 12. Only a tip of iceberg visible outside the water surface. Ans. As the density of ice is slightly less than sea water, therefore only a tip of iceberg is visible outside the water surface. IX. Answer the following questions. 1. State three factors which determine pressure in liquids. 10
11 Ans. The three factors which determine pressure in liquids are: (a) Pressure in a liquid is directly proportional to its height (depth) (b) Pressure in a liquid is directly proportional to its density. (c) Pressure in a liquid is directly proportional to the acceleration due to gravity. 2. Describe an experiment to prove that lateral pressure in liquids is directly proportional to the depth of liquid. Ans. Experiment to prove that lateral pressure in liquids is directly proportional to the depth of liquid: We take a metallic cylinder with a small opening near the base tied with a small rubber balloon. Now gradually pour water into the cylinder. We observe that with the increase in the level of water, the balloon starts bulging, i.e. more the depth of water the more is the lateral pressure. 3. Define the following terms: (a) element (b) atom (c) molecule. Ans. (a) Element: An element is defined as a substance, which cannot be subdivided into two or more simple substances by any chemical means. (b) Atom: An atom is defined as the smallest unit of an element which may or may not have an independent existence, but always takes part in a chemical reaction. (c) Molecule: Molecule is defined as the smallest unit of matter, which has an independent existence and can retain complete physical and chemical properties of matter. 4. State five important points of kinetic theory of matter. Ans. The five important points of kinetic theory of matter are: (i) Molecules are in a state of continuous motion, which does not stop over any length of time. (ii) The kinetic energy of the molecules increases with the increase in temperature and vice versa. 11
12 (iii) The molecules always attract each other. The force of attraction between similar kind of molecules is called force of cohesion while the force of attraction between different kinds of molecules is called force of adhesion. (iv) The empty space between the molecules is called intermolecular space. (v) The intermolecular force of attraction increases if the intermolecular space between the molecules decreases and vice versa. 5. On the basis of kinetic theory of matter explain. (a) Why the solids have a definite volume and definite shape? (b) Why the liquids have a definite volume but no definite shape? (c) Why the gases have no definite volume and no definite shape? Ans. (a) Intermolecular spaces between the molecules of a solid are very small, so the molecules attract one another with a strong force which holds the molecules at one particular place. Because of the fixed position of the molecules, the solids have a definite shape and definite volume. (b) Intermolecular spaces between the molecules of a liquid are large, so the molecules attract each other with a lesser force. Due to this, the molecules do not stay at one place. Instead, they interchange their position and take the shape of the containing vessel. So liquids have a definite volume but no definite shape. (c) In gases, the molecules are very much far apart, and move independently. So, the gases have no definite volume and no definite shape. 6. (a) What do you understand by the term surface tension? (b) Name the force responsible for surface tension. (c) Why does a small amount of mercury on placing over a glass plate form a spherical ball? (d) Why does a small amount of water on placing over a glass place form an oval shaped drop? 12
13 Ans. (a) The phenomenon due to which exposed (top) surface of a liquid contained in a vessel behaves like a stretched membrane is called surface tension. (b) The surface tension is mainly caused due to unbalanced cohesive force. (c) The unbalanced cohesive force acting on the molecules of liquid at the surface tends to pull them towards the centre of the liquid. It reduces the surface area and cause droplets of mercury to take a spherical shape. (d) When a small amount of water is poured on a glass plate, it takes an oval shape. It is because the force of attraction between the molecules of water i.e., the force of cohesion is far less than the force of adhesion between the molecules of water and the glass plate. 7. What do you understand by the term meniscus? Name the kind of meniscus formed (a) in case of water (b) in case of mercury. Ans. The formation of curved surface by the exposed surface of a liquid contained in a narrow vessel is called meniscus. (a) Concave meniscus is formed in case of water and (b) convex meniscus is formed in case of mercury. 8. Liquids exert pressure. Explain on the basis of kinetic model. Ans. The molecules of a liquid in a closed vessel are not stationary but move about randomly in all possible directions. In doing so, the molecules of liquid strike against the side of container, and hence, exert some force. This force exerted per unit area on the sides of containing vessel is the cause of liquid pressure. 9. Gases exert pressure. Explain on the basis of kinetic model. Ans. The molecules of a gas in a closed vessel are not stationary but move about randomly in all possible directions. In doing so, the molecules of a gas strike against the side of container and hence exert some specific force. This force exerted per unit area on the sides of containing vessel is the cause of gas pressure. 10. How does the pressure of an enclosed gas change with the decrease 13
14 in volume? Explain it on the basis of kinetic model of matter. Ans. With the decrease in volume of an enclosed gas, its pressure increases. When the gas is compressed to half its volume, the number of molecules per unit volume of the gas becomes double. So the force exerting against the side of container is also doubled. Therefore, the pressure of the enclosed gas is doubled. 11. Solids get heated by conduction. Explain conduction on the basis of kinetic model of matter. Ans. When a solid is heated from one end, its atom gain heat energy due to which their kinetic energy increases and hence they vibrate about their mean positions with more amplitude. Thus these energetic atoms strike against the neighbouring atoms and transfer a part of kinetic energy to them. Thus, the temperature of the conductor rises. 12. Fluids get heated by convection. Explain convection on the basis of kinetic model of matter. Ans. When a fluid is heated from the base of the container, then the particles in that region absorb heat energy which increases kinetic energy of the molecules. Hence, they move more vigorously. These energetic particles rise upward which results in fall in pressure. To equalise the pressure, the particles of liquid from the colder regions sink down. This in turn gives rise to convection current. 13. How does liquid pressure, depends upon the following? (a) depth of liquid (b) density of liquid (c) acceleration due to gravity at a given place (d) area of cross-section of the containing vessel Ans. (a) Liquid pressure is directly proportional to the depth of liquid. (b) Liquid pressure is directly proportional to its density. (c) Liquid pressure is directly proportional to the acceleration due to gravity at a given place. (d) Liquid pressure is independent of the area of cross-section of the containing vessel. 14. Why are the walls of a hydroelectric dam made thick at the base of dam? 14
15 Ans. The walls of the dam are made very thick at the base, so that they can withstand lateral pressure which increases with increase in depth of liquid. 15. Why do the deep sea divers wear specially designed suits? Ans. Pressure of the liquid increases with increase in depth. As sea divers go deep down into the sea, the liquid pressure exerted on them would be so great that would even crushed. So deep sea divers wear a specially designed suits to withstand this pressure. 16. What do you understand by the term atmospheric pressure? What is its average value at sea level? Ans. The force exerted by atmosphere per unit area on the surface of earth is called atmospheric pressure. The average value of atmospheric pressure at sea level is 76 cm of vertical height of mercury. 17. The atmospheric pressure at sea level is 76 cm of mercury. What do you understand by the statement. Ans. The atmospheric pressure at sea level is 76 cm of mercury. It means air exerts as much pressure at sea level as is exerted by 76 cm of vertical height of mercury column. 18. Describe briefly the construction of simple barometer? Ans. A simple barometer is obtained by inverting a mercury filled tube about 100 cm in length and closed at one end in a trough filled with mercury, taking care not to let in air by inverting the tube. 19. What do you understand by the term buoyancy and buoyant force? State two factors which determine the buoyant force exerted by a liquid. Ans. Buoyancy: The phenomenon due to which a body experiences an upward force when partly or wholly immersed in a fluid is called buoyancy. Buoyant force: An upward force experienced by a body when partly or wholly immersed in a fluid is called buoyant force. Factors determining buoyant force: (i) Buoyant force is directly proportional to the volume of the fluid displaced by solid. 15
16 (ii) Buoyant force is directly proportional to the density of fluid displaced by solid. 20. How does the atmospheric pressure decrease due to change in altitude? Ans. As we go up in the atmosphere, the atmospheric pressure decreases. At a height of 1 km above sea level, the height of mercury column in the barometer falls to 73 cm. At a height of about 40 km above the sea level the air pressure is only about 1 cm of mercury. 21. (a) State Archimedes Principle. (b) Briefly describe, how will you verify Archimedes Principle. Ans. (a) Archimedes Principle:- When a body (solid) is partly or wholly immersed in a fluid, it experiences an upward force which is equal to the weight of the fluid displaced by the immersed part of the body. (b) Verification of Archimedes Principle: (i) Take a glass stopper and tie it to a spring balance. Let its weight be W 1 g. (ii) Take an overflow jar filled with beaker and place in a clean beaker. Weigh the empty beaker. Let it be W 3 g. (iii) Now lower the stopper carefully in the overflow jar. Note the weight of the stopper when it is completely immersed. Let it be W 2 g. As the stone is immersed into the overflow jar, it displaces water which is collected in the beaker. Let the weight of beaker along with water displaced be W 4 g. Weight of stopper in air = W 1 g Weight of stopper when fully immersed in water = W 2 g Weight of empty beaker = W 3 g Weight of beaker plus displaced water = W 4 g Apparent loss in weight of water = (W 1 W 2 ) g Let us say a 1 g. Weight of water displaced = (W 4 W 3 ) g Let us say a 2 g. We will see that a 1 =a 2 16
17 i.e. (W 1 W 2 ) = (W 4 W 3 ) The apparent loss of weight of the stone or the buoyant force on it will be found to be equal to the weight of the water displaced, thus verifying Archimedes Principle. 22. (a) State the law of floatation. (b) Why does ice float on the surface of water? Ans. (a) Law of floatation: It states that when a body is floating in a liquid, then the weight of whole body acting vertically downward is equal to the weight of the liquid displaced by the immersed part of the body, acting vertically upward. (b) Density of ice is around 0.91 g cm 3 at 0 C which is less than density of fresh water 1 g cm 3. When ice is dropped in water, it experiences a greater buoyant force than its own weight and thus ice floats on the surface of water. 23. Why do ink pens start leaking on high altitude? Ans. On higher altitudes fountain pens start leaking because air inside the pen is at higher pressure than air outside. 24. Why is the hearing affected while coming down from hills? Ans. There is less atmospheric pressure at the hills, so the hearing is affected while coming down from hills. 25. State Pascal s law? Ans. Pascal s law, It states that when pressure is applied to any part of an enclosed liquid it is transmitted equally in all directions with undiminished force and acts at right angles to the surface of vessel. 26. A piece of iron sinks in water but large ships made of iron float on water. Explain why? Ans. According to law of floatation, those objects which are less dense than water will float in water and the objects whose density is greater than water will sink. The average density of ship is less than that of water whereas that of piece of iron more than that of water. Hence, larger ship floats and an iron piece sinks. 27. Why is mercury used in a barometer? Ans. Mercury is used in a barometer because 17
18 (a) density of mercury is very high and a short length of mercury can counterbalance normal atmospheric pressure. (b) it does not wet the sides of glass tube, and hence, helps in recording true atmospheric pressure. (c) it is easily seen in the glass tube. 28. What are the defects of a simple mercury barometer? Ans. A simple mercury barometer has following defects: (a) As the apparatus is all glass, therefore, there is chance of its breakage. (b) The level of mercury in the glass trough increases or decreases with the change in atmospheric pressure. Thus a permanent scale cannot be marked on the glass tube. (c) It is neither compact, nor portable, thus it cannot be carried to different places. 29. When a solid substance is heated, what happens to its molecule? Ans. When a solid is heated, kinetic energy of its molecules increases and hence they vibrate about their mean positions with more amplitude and after some time, the solid begins to change into liquids. 30. Why are liquids and gases called fluids? Ans. Liquids and gases have the property to flow. Liquids flow from upward to downward direction while gases flow in all directions. So, liquids and gases are called fluids. 18
Grade 8 Science Chapter 9 Notes
Grade 8 Science Chapter 9 Notes Force Force - Anything that causes a change in the motion of an object. - usually a push or a pull. - the unit for force is the Newton (N). Balanced Forces - forces that
More informationWrite True or False in the space provided.
CP Physics -- Exam #7 Practice Name: _ Class: Date: Write True or False in the space provided. 1) Pressure at the bottom of a lake depends on the weight density of the lake water and on the volume of the
More informationCHAPTER 3: FORCES AND PRESSURE
CHAPTER 3: FORCES AND PRESSURE 3.1 UNDERSTANDING PRESSURE 1. The pressure acting on a surface is defined as.. force per unit. area on the surface. 2. Pressure, P = F A 3. Unit for pressure is. Nm -2 or
More informationBuoyancy and Archimedes Principle. Buoyancy and Archimedes Principle Assume block is in equilibrium.
Assume block is in equilibrium. Then upward forces must equal downward forces. Upward force: pressure from fluid Downward force: atmospheric pressure plus weight Therefore In this case, the object is less
More informationKINETIC MOLECULAR THEORY OF MATTER
KINETIC MOLECULAR THEORY OF MATTER The kinetic-molecular theory is based on the idea that particles of matter are always in motion. The theory can be used to explain the properties of solids, liquids,
More informationBuoyant Force and Archimedes Principle
Buoyant Force and Archimedes Principle Predict the behavior of fluids as a result of properties including viscosity and density Demonstrate why objects sink or float Apply Archimedes Principle by measuring
More informationChapter 3 Student Reading
Chapter 3 Student Reading If you hold a solid piece of lead or iron in your hand, it feels heavy for its size. If you hold the same size piece of balsa wood or plastic, it feels light for its size. The
More informationName Class Date. F 2 2269 N A 1 88.12 cm 2 A 2 1221 cm 2 Unknown: Step 2: Write the equations for Pascal s principle and pressure, force, and area.
Skills Worksheet Math Skills Pascal s Principle After you study each sample problem and solution, work out the practice problems on a separate sheet of paper. Write your answers in the spaces provided.
More informationArchimedes Principle. Biological Systems
Archimedes Principle Introduction Many of the substances we encounter in our every day lives do not have rigid structure or form. Such substances are called fluids and can be divided into two categories:
More informationFluids I. Level : Conceptual Physics/Physics I. Q1) Order the following materials from lowest to greatest according to their densities.
Fluids I Level : Conceptual Physics/Physics I Teacher : Kim 1. Density One of the properties of any substances (solids, liquids and gases) is the measure of how tightly the material is packed together.
More information1. The Kinetic Theory of Matter states that all matter is composed of atoms and molecules that are in a constant state of constant random motion
Physical Science Period: Name: ANSWER KEY Date: Practice Test for Unit 3: Ch. 3, and some of 15 and 16: Kinetic Theory of Matter, States of matter, and and thermodynamics, and gas laws. 1. The Kinetic
More informationPhysics 181- Summer 2011 - Experiment #8 1 Experiment #8, Measurement of Density and Archimedes' Principle
Physics 181- Summer 2011 - Experiment #8 1 Experiment #8, Measurement of Density and Archimedes' Principle 1 Purpose 1. To determine the density of a fluid, such as water, by measurement of its mass when
More informationSURFACE TENSION. Definition
SURFACE TENSION Definition In the fall a fisherman s boat is often surrounded by fallen leaves that are lying on the water. The boat floats, because it is partially immersed in the water and the resulting
More informationDensity. Density is how concentrated or compact matter is.
Density Density is how concentrated or compact matter is. Packing snow into snowballs increases its density. You are squeezing large amounts of matter into small volumes of space. Equation for Density
More informationPractice Test. 4) The planet Earth loses heat mainly by A) conduction. B) convection. C) radiation. D) all of these Answer: C
Practice Test 1) Increase the pressure in a container of oxygen gas while keeping the temperature constant and you increase the A) molecular speed. B) molecular kinetic energy. C) Choice A and choice B
More informationTEACHER BACKGROUND INFORMATION THERMAL ENERGY
TEACHER BACKGROUND INFORMATION THERMAL ENERGY In general, when an object performs work on another object, it does not transfer all of its energy to that object. Some of the energy is lost as heat due to
More informationReview Chapter 10, 12, 13, 14, 15, 16. Conceptual Physics, 10e (Hewitt) Chapter 10
Review Chapter 10, 12, 13, 14, 15, 16 Conceptual Physics, 10e (Hewitt) Chapter 10 23) What prevents satellites such as a space shuttle from falling? A) gravity B) the absence of air drag C) Nothing; they're
More informationName Date Class STATES OF MATTER. SECTION 13.1 THE NATURE OF GASES (pages 385 389)
13 STATES OF MATTER SECTION 13.1 THE NATURE OF GASES (pages 385 389) This section introduces the kinetic theory and describes how it applies to gases. It defines gas pressure and explains how temperature
More informationGas Laws. The kinetic theory of matter states that particles which make up all types of matter are in constant motion.
Name Period Gas Laws Kinetic energy is the energy of motion of molecules. Gas state of matter made up of tiny particles (atoms or molecules). Each atom or molecule is very far from other atoms or molecules.
More informationConcept Questions Archimedes Principle. 8.01t Nov 24, 2004
Concept Questions Archimedes Principle 8.01t Nov 24, 2004 Pascal s Law Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel
More information13.1 The Nature of Gases. What is Kinetic Theory? Kinetic Theory and a Model for Gases. Chapter 13: States of Matter. Principles of Kinetic Theory
Chapter 13: States of Matter The Nature of Gases The Nature of Gases kinetic molecular theory (KMT), gas pressure (pascal, atmosphere, mm Hg), kinetic energy The Nature of Liquids vaporization, evaporation,
More information7. Gases, Liquids, and Solids 7.1 Kinetic Molecular Theory of Matter
7. Gases, Liquids, and Solids 7.1 Kinetic Molecular Theory of Matter Kinetic Molecular Theory of Matter The Kinetic Molecular Theory of Matter is a concept that basically states that matter is composed
More informationFluid Mechanics: Static s Kinematics Dynamics Fluid
Fluid Mechanics: Fluid mechanics may be defined as that branch of engineering science that deals with the behavior of fluid under the condition of rest and motion Fluid mechanics may be divided into three
More informationSurface Tension. the surface tension of a liquid is the energy required to increase the surface area a given amount
Tro, Chemistry: A Molecular Approach 1 Surface Tension surface tension is a property of liquids that results from the tendency of liquids to minimize their surface area in order to minimize their surface
More information(Walter Glogowski, Chaz Shapiro & Reid Sherman) INTRODUCTION
Convection (Walter Glogowski, Chaz Shapiro & Reid Sherman) INTRODUCTION You know from common experience that when there's a difference in temperature between two places close to each other, the temperatures
More informationBuoyancy Problem Set
Buoyancy Problem Set 1) A stone weighs 105 lb in air. When submerged in water, it weighs 67.0 lb. Find the volume and specific gravity of the stone. (Specific gravity of an object: ratio object density
More informationThree Methods for Calculating the Buoyant Force Gleue: Physics
Three Methods for Calculating the Buoyant Force Gleue: Physics Name Hr. The Buoyant Force (F b ) is the apparent loss of weight for an object submerged in a fluid. For example if you have an object immersed
More informationLesson 2 The Buoyant Force
Lesson 2 Student Labs and Activities Page Launch Lab 26 Content Vocabulary 27 Lesson Outline 28 MiniLab 30 Content Practice A 31 Content Practice B 32 School to Home 33 Key Concept Builders 34 Enrichment
More informationChapter 1 Student Reading
Chapter 1 Student Reading Chemistry is the study of matter You could say that chemistry is the science that studies all the stuff in the entire world. A more scientific term for stuff is matter. So chemistry
More informationStudy the following diagrams of the States of Matter. Label the names of the Changes of State between the different states.
Describe the strength of attractive forces between particles. Describe the amount of space between particles. Can the particles in this state be compressed? Do the particles in this state have a definite
More informationChapter 13 - Solutions
= Chapter 13 - Solutions Description: Find the weight of a cylindrical iron rod given its area and length and the density of iron. Part A On a part-time job you are asked to bring a cylindrical iron rod
More informationSolids, Liquids, and Gases
Glencoe Science Chapter Resources Solids, Liquids, and Gases Includes: Reproducible Student Pages ASSESSMENT Chapter Tests Chapter Review HANDS-ON ACTIVITIES Lab Worksheets for each Student Edition Activity
More informationChapter 3. Flotation. ELEMENTARY HYDRAULICS National Certificate in Technology (Civil Engineering) Buoyancy
ELEMENTARY HYDRAULICS National Certificate in Technology (Civil Engineering) Chapter 3 Flotation Buoyancy Buoyancy arises from the fact that fluid pressure increases with depth and from the fact that the
More informationTemperature Measure of KE At the same temperature, heavier molecules have less speed Absolute Zero -273 o C 0 K
Temperature Measure of KE At the same temperature, heavier molecules have less speed Absolute Zero -273 o C 0 K Kinetic Molecular Theory of Gases 1. Large number of atoms/molecules in random motion 2.
More informationName Date Class. As you read about the properties of air, fill in the detail boxes that explain the main idea in the graphic organizer below.
Name Date Class The Atmosphere Guided Reading and Study Air Pressure This section describes several properties of air, including density and air pressure. The section also explains how air pressure is
More informationReaction of Magnesium with Hydrochloric Acid (Gas Laws) Chemicals Needed:
Reaction of Magnesium with Hydrochloric Acid (Gas Laws) Your Name: Date: Partner(s) Names: Objectives: React magnesium metal with hydrochloric acid, collecting the hydrogen over water. Calculate the grams
More informationVAPORIZATION IN MORE DETAIL. Energy needed to escape into gas phase GAS LIQUID. Kinetic energy. Average kinetic energy
30 VAPORIZATION IN MORE DETAIL GAS Energy needed to escape into gas phase LIQUID Kinetic energy Average kinetic energy - For a molecule to move from the liquid phase to the gas phase, it must acquire enough
More informationThe Molar Mass of a Gas
The Molar Mass of a Gas Goals The purpose of this experiment is to determine the number of grams per mole of a gas by measuring the pressure, volume, temperature, and mass of a sample. Terms to Know Molar
More informationTest Bank - Chapter 3 Multiple Choice
Test Bank - Chapter 3 The questions in the test bank cover the concepts from the lessons in Chapter 3. Select questions from any of the categories that match the content you covered with students. The
More informationStates of Matter and the Kinetic Molecular Theory - Gr10 [CAPS]
OpenStax-CNX module: m38210 1 States of Matter and the Kinetic Molecular Theory - Gr10 [CAPS] Free High School Science Texts Project This work is produced by OpenStax-CNX and licensed under the Creative
More informationPhysical and Chemical Properties of Matter
Physical and Chemical Properties of Matter What is matter? Anything that has mass and takes up space Chemical or Physical Property? Physical properties of matter: characteristics that can be observed or
More informationMolar Mass of Butane
Cautions Butane is toxic and flammable. No OPEN Flames should be used in this experiment. Purpose The purpose of this experiment is to determine the molar mass of butane using Dalton s Law of Partial Pressures
More informationStates of Matter CHAPTER 10 REVIEW SECTION 1. Name Date Class. Answer the following questions in the space provided.
CHAPTER 10 REVIEW States of Matter SECTION 1 SHORT ANSWER Answer the following questions in the space provided. 1. Identify whether the descriptions below describe an ideal gas or a real gas. ideal gas
More informationFloating and sinking
Floating and sinking Introduction Floating and sinking is a common activity in early years classrooms. Students ideas about floating and sinking are intriguing. The strategies for developing their understandings
More informationStudent Exploration: Archimedes Principle
Name: Date: Student Exploration: Archimedes Principle Vocabulary: Archimedes principle, buoyant force, density, displace, mass, volume, weight Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
More informationEXPERIMENT 15: Ideal Gas Law: Molecular Weight of a Vapor
EXPERIMENT 15: Ideal Gas Law: Molecular Weight of a Vapor Purpose: In this experiment you will use the ideal gas law to calculate the molecular weight of a volatile liquid compound by measuring the mass,
More informationA drop forms when liquid is forced out of a small tube. The shape of the drop is determined by a balance of pressure, gravity, and surface tension
A drop forms when liquid is forced out of a small tube. The shape of the drop is determined by a balance of pressure, gravity, and surface tension forces. 2 Objectives Have a working knowledge of the basic
More informationDensity Lab. If you get stuck or are uncertain, please ask questions and/or refer to the hints at the end of the lab. Name: Section: Due Date:
Name: Section: Due Date: Lab 01B-1 If you get stuck or are uncertain, please ask questions and/or refer to the hints at the end of the lab. Density Lab Density is an important concept in oceanography,
More informationChemistry 13: States of Matter
Chemistry 13: States of Matter Name: Period: Date: Chemistry Content Standard: Gases and Their Properties The kinetic molecular theory describes the motion of atoms and molecules and explains the properties
More informationLift vs. Gravity Questions:
LIFT vs GRAVITY Sir Isaac Newton, an English scientist, observed the force of gravity when he was sitting under a tree and an apple fell on his head! It is a strong force that pulls everything down toward
More informationName: Class: Date: 10. Some substances, when exposed to visible light, absorb more energy as heat than other substances absorb.
Name: Class: Date: ID: A PS Chapter 13 Review Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 1. In all cooling
More information1.4.6-1.4.8 Gas Laws. Heat and Temperature
1.4.6-1.4.8 Gas Laws Heat and Temperature Often the concepts of heat and temperature are thought to be the same, but they are not. Perhaps the reason the two are incorrectly thought to be the same is because
More informationBuoyant Force and Archimedes' Principle
Buoyant Force and Archimedes' Principle Introduction: Buoyant forces keep Supertankers from sinking and party balloons floating. An object that is more dense than a liquid will sink in that liquid. If
More informationBuoyancy. What floats your boat?
Buoyancy What floats your boat? Sink or float? Test The cube sinks to the bottom. WHY? Weight Due to the pulling force of gravity both the cube and the water have the property of weight. Gravity Gravity
More informationName Class Date. In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question.
Assessment Chapter Test A Chapter: States of Matter In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. 1. The kinetic-molecular
More information9460218_CH06_p069-080.qxd 1/20/10 9:44 PM Page 69 GAS PROPERTIES PURPOSE
9460218_CH06_p069-080.qxd 1/20/10 9:44 PM Page 69 6 GAS PROPERTIES PURPOSE The purpose of this lab is to investigate how properties of gases pressure, temperature, and volume are related. Also, you will
More informationChemistry 112 Laboratory Experiment 6: The Reaction of Aluminum and Zinc with Hydrochloric Acid
Chemistry 112 Laboratory Experiment 6: The Reaction of Aluminum and Zinc with Hydrochloric Acid Introduction Many metals react with acids to form hydrogen gas. In this experiment, you will use the reactions
More informationChapter 10 Temperature and Heat
Chapter 10 Temperature and Heat What are temperature and heat? Are they the same? What causes heat? What Is Temperature? How do we measure temperature? What are we actually measuring? Temperature and Its
More information12.307. 1 Convection in water (an almost-incompressible fluid)
12.307 Convection in water (an almost-incompressible fluid) John Marshall, Lodovica Illari and Alan Plumb March, 2004 1 Convection in water (an almost-incompressible fluid) 1.1 Buoyancy Objects that are
More informationWhy do objects float or sink?
Why do objects float or sink? Summary Students will use models to gain an understanding of the principles of buoyancy and how they apply to technologies used to explore the ocean Learning Objectives Students
More informationPhysics 1114: Unit 6 Homework: Answers
Physics 1114: Unit 6 Homework: Answers Problem set 1 1. A rod 4.2 m long and 0.50 cm 2 in cross-sectional area is stretched 0.20 cm under a tension of 12,000 N. a) The stress is the Force (1.2 10 4 N)
More informationForces. Definition Friction Falling Objects Projectiles Newton s Laws of Motion Momentum Universal Forces Fluid Pressure Hydraulics Buoyancy
Forces Definition Friction Falling Objects Projectiles Newton s Laws of Motion Momentum Universal Forces Fluid Pressure Hydraulics Buoyancy Definition of Force Force = a push or pull that causes a change
More information10.7 Kinetic Molecular Theory. 10.7 Kinetic Molecular Theory. Kinetic Molecular Theory. Kinetic Molecular Theory. Kinetic Molecular Theory
The first scheduled quiz will be given next Tuesday during Lecture. It will last 5 minutes. Bring pencil, calculator, and your book. The coverage will be pp 364-44, i.e. Sections 0.0 through.4. 0.7 Theory
More informationChapter 4 Practice Quiz
Chapter 4 Practice Quiz 1. Label each box with the appropriate state of matter. A) I: Gas II: Liquid III: Solid B) I: Liquid II: Solid III: Gas C) I: Solid II: Liquid III: Gas D) I: Gas II: Solid III:
More informationLecture 24 - Surface tension, viscous flow, thermodynamics
Lecture 24 - Surface tension, viscous flow, thermodynamics Surface tension, surface energy The atoms at the surface of a solid or liquid are not happy. Their bonding is less ideal than the bonding of atoms
More informationMSCOPE Final Project Report Melanie Hopkins, Mary Leighton, Roscoe Nicholson, and Panos Oikonomou. Sink or Swim. Photo: M.
MSCOPE Final Project Report Melanie Hopkins, Mary Leighton, Roscoe Nicholson, and Panos Oikonomou Sink or Swim Type of Project: Facilitated activity with optional demonstration Target Museum: SciTech Hands-On
More informationKinetic Theory of Gases. 6.1 Properties of Gases 6.2 Gas Pressure. Properties That Describe a Gas. Gas Pressure. Learning Check.
Chapter 6 Gases Kinetic Theory of Gases 6.1 Properties of Gases 6.2 Gas Pressure A gas consists of small particles that move rapidly in straight lines. have essentially no attractive (or repulsive) forces.
More informationChapter 3, Lesson 4: Density: Sink and Float for Solids
Chapter 3, Lesson 4: Density: Sink and Float for Solids Key Concepts The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than
More informationSOLUBILITY OF A SALT IN WATER AT VARIOUS TEMPERATURES LAB
SOLUBILITY OF A SALT IN WATER AT VARIOUS TEMPERATURES LAB Purpose: Most ionic compounds are considered by chemists to be salts and many of these are water soluble. In this lab, you will determine the solubility,
More informationA. Kinetic Molecular Theory (KMT) = the idea that particles of matter are always in motion and that this motion has consequences.
I. MOLECULES IN MOTION: A. Kinetic Molecular Theory (KMT) = the idea that particles of matter are always in motion and that this motion has consequences. 1) theory developed in the late 19 th century to
More informationMaterials 10-mL graduated cylinder l or 2-L beaker, preferably tall-form Thermometer
VAPOR PRESSURE OF WATER Introduction At very low temperatures (temperatures near the freezing point), the rate of evaporation of water (or any liquid) is negligible. But as its temperature increases, more
More informationMultiple Choice For questions 1-10, circle only one answer.
Test Bank - Chapter 1 The questions in the test bank cover the concepts from the lessons in Chapter 1. Select questions from any of the categories that match the content you covered with students. The
More informationChem 112 Intermolecular Forces Chang From the book (10, 12, 14, 16, 18, 20,84,92,94,102,104, 108, 112, 114, 118 and 134)
Chem 112 Intermolecular Forces Chang From the book (10, 12, 14, 16, 18, 20,84,92,94,102,104, 108, 112, 114, 118 and 134) 1. Helium atoms do not combine to form He 2 molecules, What is the strongest attractive
More informationWritten By Kelly Lundstrom & Kennda Lynch January 31, 2012 Milk Dye ACTIVITY PLAN
Milk Dye ACTIVITY PLAN Objective: Students will use the scientific method to test the difference between using whole milk and skim milk in this milk and food dye experiment. Students will explore ideas
More informationWhen the fluid velocity is zero, called the hydrostatic condition, the pressure variation is due only to the weight of the fluid.
Fluid Statics When the fluid velocity is zero, called the hydrostatic condition, the pressure variation is due only to the weight of the fluid. Consider a small wedge of fluid at rest of size Δx, Δz, Δs
More informationKinetic Molecular Theory and Gas Laws
Kinetic Molecular Theory and Gas Laws I. Handout: Unit Notes II. Modeling at the Atomic Scale I. In another unit you learned about the history of the atom and the different models people had of what the
More informationPartner: Jack 17 November 2011. Determination of the Molar Mass of Volatile Liquids
Partner: Jack 17 November 2011 Determination of the Molar Mass of Volatile Liquids Purpose: The purpose of this experiment is to determine the molar mass of three volatile liquids. The liquid is vaporized
More informationDensity: Sea Water Mixing and Sinking
Density: Sea Water Mixing and Sinking Unit: Salinity Patterr~s & the Water Cycle I Grade Level: Middle or High I Time Required: two 45 minute class periods I Content Standard: NSES Physical Science, properties
More informationHot Leaks. See how the temperature of liquids changes the way they flow.
P h y s i c s Q u e s t A c t i v i t i e s Activity 2 1 Hot Leaks See how the temperature of liquids changes the way they flow. Safety: This experiment requires using the hot water tap and straight pins.
More informationConvection, Conduction & Radiation
Convection, Conduction & Radiation There are three basic ways in which heat is transferred: convection, conduction and radiation. In gases and liquids, heat is usually transferred by convection, in which
More informationEighth Grade, Density To Float or Not to Float? 2004 Colorado Unit Writing Project 1
Density To Float or Not to Float? That is the Question! Grade Level or Special Area: Eighth Grade Science Written by: Aida Peterson, Clear Lake Middle School, Denver, Colorado Length of Unit: Twelve lessons
More informationKeep Your Head Above Water
Grade 8 Activity Keep Your Head Above Water Do things that float behave differently in salt and fresh water? What lets them float, and when do they sink? Concepts Water has physical properties of density
More informationSorting Materials into Groups
Sorting Materials into Groups 4 CHAPTER Tips and Tricks Objects around us have different shapes, colours and uses. They are made up of one or more materials such as paper, glass, plastic, cloth, wood,
More informationPartnerships Implementing Engineering Education Worcester Polytechnic Institute Worcester Public Schools
Partnerships Implementing Engineering Education Worcester Polytechnic Institute Worcester Public Schools Supported by: National Science Foundation Weather: 4.H.3 Weather and Classical Instruments Grade
More informationPressure. Curriculum for Excellence. Weather and Climate Cross-curricular project Section 2. Background Information:
Curriculum for Excellence Weather and Climate Cross-curricular project Section 2 Pressure Background Information: Air pressure is the force exerted by air particles. The air around us pushes on us and
More informationNatural Convection. Buoyancy force
Natural Convection In natural convection, the fluid motion occurs by natural means such as buoyancy. Since the fluid velocity associated with natural convection is relatively low, the heat transfer coefficient
More informationESSAY. Write your answer in the space provided or on a separate sheet of paper.
Test 1 General Chemistry CH116 Summer, 2012 University of Massachusetts, Boston Name ESSAY. Write your answer in the space provided or on a separate sheet of paper. 1) Sodium hydride reacts with excess
More informationWhat is Energy? What is the relationship between energy and work?
What is Energy? What is the relationship between energy and work? Compare kinetic and potential energy What are the different types of energy? What is energy? Energy is the ability to do work. Great, but
More informationSAM Teachers Guide Heat and Temperature
SAM Teachers Guide Heat and Temperature Overview Students learn that temperature measures average kinetic energy, and heat is the transfer of energy from hot systems to cold systems. They consider what
More informationUnit 3: States of Matter Practice Exam
Page 1 Unit 3: States of Matter Practice Exam Multiple Choice. Identify the choice that best completes the statement or answers the question. 1. Two gases with unequal masses are injected into opposite
More informationWater Biochemistry Resources
Water Biochemistry This lesson is aimed at more able and post 16 students. In this lesson students are encouraged to understand how the chemistry of water makes it so essential for life on earth, with
More informationSolids, Liquids, and Gases
Solids, Liquids, and Gases nd Intended for Grade: 2 Grade Subject: Science Description: Activities to help students understand solids, liquids, gases, and the changes between these states. Objective: The
More informationChapter 2: Forms of Energy
Chapter 2: Forms of Energy Goals of Period 2 Section 2.1: To describe the forms of energy Section 2.2: To illustrate conversions from one form of energy to another Section 2.3 To describe energy storage
More informationAZ State Standards. Concept 3: Conservation of Energy and Increase in Disorder Understand ways that energy is conserved, stored, and transferred.
Forms of Energy AZ State Standards Concept 3: Conservation of Energy and Increase in Disorder Understand ways that energy is conserved, stored, and transferred. PO 1. Describe the following ways in which
More informationXI / PHYSICS FLUIDS IN MOTION 11/PA
Viscosity It is the property of a liquid due to which it flows in the form of layers and each layer opposes the motion of its adjacent layer. Cause of viscosity Consider two neighboring liquid layers A
More informationPOTATO FLOAT. Common Preconceptions:
POTATO FLOAT Unit: Salinity Patterns & the Water Cycle l Grade Level: Middle l Time Required: 30 min. (in class) after solutions are prepared by the teacher l Content Standard: NSES Physical Science, properties
More information7. 1.00 atm = 760 torr = 760 mm Hg = 101.325 kpa = 14.70 psi. = 0.446 atm. = 0.993 atm. = 107 kpa 760 torr 1 atm 760 mm Hg = 790.
CHATER 3. The atmosphere is a homogeneous mixture (a solution) of gases.. Solids and liquids have essentially fixed volumes and are not able to be compressed easily. have volumes that depend on their conditions,
More informationMercury is poured into a U-tube as in Figure (14.18a). The left arm of the tube has crosssectional
Chapter 14 Fluid Mechanics. Solutions of Selected Problems 14.1 Problem 14.18 (In the text book) Mercury is poured into a U-tube as in Figure (14.18a). The left arm of the tube has crosssectional area
More informationTHE KINETIC THEORY OF GASES
Chapter 19: THE KINETIC THEORY OF GASES 1. Evidence that a gas consists mostly of empty space is the fact that: A. the density of a gas becomes much greater when it is liquefied B. gases exert pressure
More informationBuoyancy. Program Description. Louisiana GLEs: Grades: 3 rd - 5 th grades Program Duration: 60 Minutes Program Type: Demonstration
Buoyancy Grades: 3 rd - 5 th grades Program Duration: 60 Minutes Program Type: Demonstration Program Description In this program students will investigate Archimedes Principle by using pan balances and
More information