Middle School Physical Science FGCU STEM Competition March 2014

Transcription

1 Choose the one alternative that BEST completes the statement or answers the question. Please note that choice E) is NOTA "None of the above answers is correct". 1) If a bottle of mineral water contains 2.00 L, what is the volume in quarts? A) 1,890,000 qt B) 1.06 qt C) 2.11 qt D) 1.89 qt 2) Is the synthesis of ozone, O 3, from oxygen, O 2, an example of an exothermic or endothermic reaction? A) exothermic because ultraviolet light is emitted during its formation B) exothermic because ultraviolet light is absorbed during its formation C) endothermic because ultraviolet light is emitted during its formation D) endothermic because ultraviolet light is absorbed during its formation 3) What is the chemical formula for nitric acid? A) H2NO2(aq) B) HNO3(aq) C) H2NO3(aq) D) HNO2(aq) 4) Which of the following is the basic unit of temperature in the SI system? A) Celsius degree ( C) B) Kelvin unit (K) C) Fahrenheit degree ( F) 5) The is what needs to be overcome in a reaction so that it can proceed to the products. A) catalyst B) entropy C) bond energy D) thermodynamics 6) What is the chemical formula for hydrocyanic acid? A) HCNO(aq) B) H3N(aq) C) HCN(aq) D) HN3(aq) Page 1 of 9

2 7) How many significant digits are in the mass measurement gram? A) 1 B) 2 C) 3 D) 4 8) When an object falls through the air and gains velocity, the net force actually A) increases. B) remains the same whether in air or in a vacuum. C) decreases. D) both increases and decreases. 9) Earth's magnetic field affects cosmic rays by A) deflecting them. B) slowing their speeds. C) absorbing them. D) destroying them. 10) Of the sciences known as physics, chemistry, and biology, the most basic is A) biology. B) physics. C) chemistry. D) none in particular, as each may be considered fundamental. 11) Which of the following can express the total amount of heat energy in a sealed, insulated chamber? A) 20.0 C B) 68.0 F C) 20.0 kcal D) K 12) The speeds of the planets about the Sun depend on A) their distances from the Sun. B) the masses of the planets. C) both D) neither Page 2 of 9

3 13) Calculate the kinetic energy of a kg baseball thrown at a velocity of 44 m/s. A) 290 J B) 440 J C) 510 J D) 580 J 14) Aqueous HClO2 is classified as which of the following? A) binary ionic B) ternary ionic C) binary molecular D) ternary oxyacid 15) A hydronium ion is a hydrogen ion bonded to which of the following? A) hydroxide ion B) hydrogen atom C) water molecule D) hydrogen molecule 16) A skydiver steps from a helicopter and falls for 5 s before reaching terminal velocity. During this 5-s interval, her acceleration A) increases. B) is constant. C) decreases. D) is zero. 17) A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed? A) 5 m/s B) 20 m/s C) 25 m/s D) 10 m/s 18) Oxygen atoms are used to make water molecules. Does this mean that oxygen, O 2, and water, H 2 O, have similar properties? A) Yes, and this explains how fish are able to breathe water. B) No, compounds are uniquely different from the elements from which they're made. C) Yes, but that their properties are similar is only a coincidence. D) No, but their similar properties are only a coincidence. Page 3 of 9

4 19) Aristotle treated motion by A) classifying it into two classes. B) measurements of distance travelled. C) comparing the distance traveled with the time of travel. 20) What is the color of phenolphthalein indicator in pure water? A) blue B) pink C) colorless D) red 21) When a crate slides down an incline at a constant velocity it is A) in dynamic equilibrium. B) in a state of being in and out of dynamic equilibrium. C) not in dynamic equilibrium. 22) In performing a multistep calculation, when should you round off the answer in the calculator display? A) after the second unit factor B) after the final calculation C) after the first unit factor D) after each step in the calculation 23) When a current-carrying wire in a magnetic field experiences no force it is likely A) parallel to the field lines. B) overly insulated. C) upside down relative to the field. 24) If you toss a ball straight upward at 40 m/s with no air resistance, one second after it reaches the top of its path its speed is A) 20 m/s. B) zero. C) 10 m/s. D) 30 m/s Page 4 of 9

5 25) The nuclear fusion of 1H and 5B produces which element? A) carbon B) helium C) beryllium D) lithium 26) A container with rigid walls is filled with 4 mol of air with. How much does the internal energy change if the temperature rises from to? A) 3500 J B) 8750 J C) 35,000 J D) NOTA 27) A galvanometer calibrated to read potential difference is A) a voltmeter. B) an ammeter. C) an ohm meter. D) NOTA 28) Multiply times and express the answer in scientific notation. A) B) C) D) ) If milk of magnesia has a ph of 10, the solution is which of the following? A) strongly acidic B) weakly acidic C) neutral D) weakly basic 30) If 48.0 quarts of water has a mass of lb, what is the volume in liters? A) L B) 45.4 L C) 50.7 L D) 94.6 L Page 5 of 9

6 31) A scientific hypothesis can be disproved with A) disapproval of other scientists. B) philosophical reasoning. C) many tests by many scientists. D) one reproducible experiment. 32) Which of the following would be considered applied research? A) testing the strength of a piece of metal B) determining how readily a metal corrodes in a wet environment C) determining the melting temperature of a metal D) determining the lightest and strongest metal to be used for an airplane wing 33) The yeast in bread dough feeds on sugar to produce carbon dioxide. Why does the dough rise faster in a warmer area? A) Atmospheric pressure decreases with increasing temperature. B) The rate of evaporation increases with increasing temperature. C) The yeast tends to "wake up" with warmer temperatures, which is why baker's yeast is best stored in the refrigerator. D) There is a greater number of effective collisions among reacting molecules. 34) A superconducting electromagnet makes use of A) super-high temperatures. B) low-resistance coils of wire. C) close packing of high-density magnetic domains. D) high-speed electrons. 35) Chemistry is the study of. A) matter B) transformations of matter C) only microscopic phenomena D) both A and B 36) A given net force propels an object along a straight-line path by a force. If the mass were doubled, its acceleration would A) quadruple. B) be half. C) double. D) stay the same. Page 6 of 9

7 37) How many different elements are in the compound C6H12O6? A) 24 B) 3 C) 6 D) All of the elements are the same. 38) Multiply 7.2 m by 3.75 m by m and round off the answer. A) 42.0 m3 B) 41.9 m3 C) m3 D) 42 m3 39) A child throws a tennis ball at 12 m/s directly at the front of a school bus which is moving at 21 m/s towards him. If the collision is elastic, find the speed with which the ball bounces from the bus. A) 54 m/s B) 30 m/s C) 45 m/s D) 33 m/s 40) What is the predicted ionic charge for a P ion? A) 3- B) 5+ C) 3+ D) 5-41) Surrounding every moving electron is A) an electric field. B) a magnetic field. C) both D) neither 42) What is the Stock system name for Hg2+? A) mercuric ion B) mercurous ion C) mercury(ii) ion D) mercury(i) ion Page 7 of 9

8 43) Which of the following indicators is red in an acidic solution and yellow in a basic solution? A) methyl red B) bromthymol blue C) phenolphthalein 44) The force of gravity does work on a satellite when it is in A) elliptical orbit. B) circular orbit. C) both D) neither 45) Your weight is A) the gravitational attraction between you and Earth. B) a property of mechanical equilibrium. C) another word for your mass. D) the same in all locations. 46) The S2- ion is classified as which of the following? A) monoatomic cation B) monoatomic anion C) polyatomic cation D) polyatomic anion 47) The scientist to first introduce the concept of inertia was A) Newton. B) Galileo. C) Aristotle. D) Copernicus. 48) A glass beaker of unknown mass contains 65.0 ml of water. The system absorbs ca of heat and the temperature rises as a result. What is the mass of the beaker? (The specific heat for glass is.) A) 560 g B) 270,000 g C) 540 g D) 190 g Page 8 of 9

9 49) What is the term for the process of a polar molecular compound dissolving in water and forming positive and negative ions? A) dissociation B) solvation C) hydration D) ionization 50) Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this? A) a chemical change B) a molecular change C) a decomposition D) a physical change Page 9 of 9