Unit 1 & 2 Test Review

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1 Topics to Study Types of information you would find on the MSDS Sheet How to read the NFPA code o You need to be able to tell me the meaning of the information in each box Safety procedures from the safety video and safety contract o Link to video Safety symbols Lab Equipment identification and what they are used for How to count the number of significant figures How to do calculation with significant figures Write a number in the scientific notation Precision vs. Accuracy Physical and chemical properties including intensive and extensive Physical and chemical change Separation Techniques Classification of Matter (Know the flow chart!!) o Pure substances: element and compound o Mixtures: homogeneous, heterogeneous...and homogeneous colloid Kinetic Molecular Theory (KMT): characteristic of solid, liquid, and gas o Space between molecules o Attraction between molecules aka intermolecular interactions o Freedom of motion o Diffusion (the movement of molecules from an area of high concentration to lower concentration o Density o Compressibility o Shape and volume o Expansion rate Density

2 Safety procedures from the safety video and safety contract 1. If there is an unknown clear liquid spilled on your countertop, what should you do? A. smell it B. touch it to see if it burns the skin C. clean it up with paper towels D. notify the teacher 2. If you accidentally burn yourself, how should the burn be treated? A. flush with cold water B. wrap tightly with a paper towel C. pour baking soda on it D. cover with ointment Safety symbols Write the hazard, precaution, example, and remedy for each of the following symbols. 1. Poison 2. Fume 3. Reactive WHEN IN DOUBT WEAR GOGGLES!!

3 Equipment identification: Know what all of the equipment are called and the purpose of them Identify the following pieces of laboratory equipment. 10. Ring clamp or iron ring 11. Buret 12. Beaker tongs 13. Crucible Which of the following is the best piece of equipment for measuring liquid volume? A. Erlenmeyer flask B. beaker C. volumetric flask D. graduated cylinder ** volumetric flask is good for MAKING SOLUTIONS

4 Physical and chemical properties including intensive and extensive AND Physical and chemical change chemical density mass properties physical substance Matter is anything with (1) mass and volume. A (2) substance is a form of matter with a uniform and unchanging composition. Substances have specific, unchanging (3) properties that can be observed. Substances have both physical and chemical properties. (4) Physical properties can be observed without changing a substance s chemical composition. Color, hardness, and (5) density are examples. Other properties cannot be observed without changing the composition of a substance. These are called (6) chemical properties. An example is the tendency of iron to form rust when exposed to air. Label each property as either intensive physical, extensive physical or chemical. Intensive 7. Chemical formula H2O Chemical 8. Forms green carbonate when exposed to moist air Chemical 9. Remains unchanged when in the presence of nitrogen Intensive 10. Colorless Extensive 11. Has a mass of 3.7 g Chemical 12. Ability to combine with another substance Intensive 13. Melting point Extensive 14. Has a volume of 25 ml Intensive 15. Boiling point is 100 C Intensive 16. Conducts electricity Intensive 17. Density is 1g/cm3

5 What kinds of changes do these words indicate? Write each word under the correct heading. Use each word only once. boil crumple crush explode burn ferment freeze grind condense melt oxidize rot corrode rust tarnish vaporize Physical Change Chemical Change 1. boil 9. explode 2. crumple 10. burn 3. crush 11. ferment 4. freeze 12. oxidize 5. grind 13. rot 6. condense 14. corrode 7. melt 15. rust 8. vaporize 16. tarnish Physical Changes Composition doesn t change Change in size, shape Phase Change Melting Solidifying (aka freezing) Vaporizing Condensing Sublimating Deposition Chemical Changes Composition does change Color changes Temperature changes New substance formed (solid, gas) Odor change Physical Properties Mass (extensive) Volume (extensive) Length (extensive) Density (intensive) Melting & Boiling points (intensive) Solubility (intensive) Color (intensive) Viscosity (intensive) Malleability (intensive) Ductility (intensive) Conductivity (intensive) Hardness (intensive) Magnetism (intensive) Chemical Properties Stability/Reactivity Toxicity ph Fermentation Oxidation Flammability

6 Light produced Separation Techniques For each item in Column A, write the letter of the matching item in Column B. Column A B 1. Separates substances on the basis of the boiling points of the substances C 2. Separates by formation of solid, pure particles from a solution D 3. Separates substances based on their movement through a special paper A 4. Separates solids from liquids by using a porous barrier Column B a. filtration b. distillation c. crystallization d. chromatography Classification of Matter Define the following and give an example for each. 1. Homogeneous mixture Looks the same throughout salt water 2. Heterogeneous mixture Does not look the same throughout fruit salad Circle the letter of the choice that best completes the statement or answers the question. 1. A substance that cannot be separated into simpler substances by physical or chemical means is a(n) a. compound. b. mixture. c. element. d. period. 2. A chemical combination of two or more different elements is a(n) a. solution. b. compound. c. element. d. period. 3. Which of the following is an example of an element? a. water b. air c. sugar d. oxygen 4. Which of the following is an example of a compound? a. gold b. silver c. aspirin d. copper

7 Label each substance as either an element or a compound. Element 7. silicon Compound 8. sodium chloride Element 9. francium Element 10. nickel Compound 11. ice Classification of Matter Graphic Organizer Can the substance be separated by physical means? Yes No Pure substance Mixture Can it be separated by chemical means? Can you see different particles of matter? Yes Chemical No Element Yes Heterogeneous No Homogeneous

8 Kinetic Molecular Theory (KMT): characteristic of state of matter (solid, liquid, and gas) Label each drawing with one of these words: solid, liquid, gas. 2) Rank each state of matter from low to high kinetic energy (KE). 3) Rank each as most compressible to least compressible. State of matter Gas Kinetic Energy High Compressibility High State of matter Solid Kinetic Energy very low Compressibility None State of matter Liquid Kinetic Energy moderate Compressibility very low

9 For each statement below, write true or false. True All matter that we encounter in everyday life exists in one of three physical forms. True A solid has definite shape and volume. False A liquid has a definite shape and takes on the volume of its container. True A gas has both the shape and the volume of its container. False The particles in a gas cannot be compressed into a smaller volume. False The particles in a solid are spaced far apart. Density 1. Your have a box that has a volume of 412 cm3 and weighs 42g. What is its density? 0.10 g/cm 3 2. Calculate the density of a 500 g rectangular block with the following dimensions: length=8 cm, width=6 cm, height=5 cm. 2 g/cm 3 3. One side of a cube is 6 cm long. Its weight is 220 g. What is the density of the cube? 1 g/cm 3 4. You are given a cube with a length of 2.5 cm, a width of 2.5 cm, and a height of 2.5 cm. You place it on a scale, and its mass is 295 g. Calculate the density. 19 g/cm 3 IMPORTANT! Study the safety rules, safety symbols and equipment list!!! If you have lost yours or never got one, PLEASE ask for copies. Approximately 10 questions out of 33 are safety and equipment relate.

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