1. Answers

2. 1 The amount of matter that a material has is its ___. B mass A C D volume density composition

3. 2 Lithium reacts with oxygen to produce lithium oxide. The product in this reaction is ___. C A B lithium oxygen lithium oxide

4. 3 Which of the following is not a pure substance? C Salt water A B CO 2 He D H2OH2O

5. 4 Which of the following is a mixture? A B C Air Aspirin Tacos D All of the above are mixtures

6. 5 Which of the following is a heterogeneous mixture? A Trail mix B C Soda Orange juice (no pulp) D Vanilla ice cream

7. 6 How many phases are in a homogeneous mixture? A 1 only B C 2 only 2 or more

8. 7 Which of the following is a compound? B BH 3 A C H-1 Ca 2+ D Hg

9. 8 The variable that is changed in an experiment is the ___. B independent variable A C control dependent variable D hypothesis

10. 9 A concise statement that summarizes numerous observations is a(n) ___. C scientific law A B hypothesis scientific theory D observation

11. 10 Which of the following is not a physical property of hydrogen? C It combines with oxygen to produce water. A B It is a gas at room temp. It has a density of 0.89 g/mL. D It has no color.

12. 11 What state of matter has an indefinite shape and indefinite volume? C A B Solid Liquid Gas

13. 12 What of the following is a physical change? C Evaporation A B Burning Rusting D Explosion

14. 13 The statement “the pressure of a gas increases with decreasing volume because there are more collisions between particles” is a ___. B scientific theory A C scientific law hypothesis D experiment

15. 14 Which of the following is not a physical change? B cooking a hamburger A C melting butter freezing water D peeling an orange

16. 15 Lithium metal reacts with water to produce lithium oxide. Is this a physical or chemical change? B A physical chemical

17. 16 Which statement about compounds is true? C Compounds have a fixed composition A B Compounds can be separated by physical means Compounds consist of more than 1 phase D All of the above are true

18. 17 Which statement about mixtures is true? A B C Mixtures can consist of one phase or more than 1 phase Mixtures can be separated by physical means In a mixture, properties of the individual parts are maintained D All of the above are true

19. 18 What is one difference between a mixture and a compound? B A compound can only be separated by chemical means A C A compound consists of more than one phase A mixture can only be formed by chemical means D A mixture must be uniform in composition

20. 19 What is the best way to check that a chemical reaction has occurred? C See if the chemical composition changed A B See if a gas was produced D See if the color changed See if light/energy was produced

21. 20 What happens to matter in a chemical reaction? A It is conserved. You get out what you put in. B C Matter is gained. Matter is lost.

22. 21 What is an intensive property of iron? A B C Its color Its hardness Its magnetism D All of the above are intensive properties

23. 22 How would you describe the following picture? A heterogeneous mixture of gas molecules

24. 23 What do chemical symbols and formulas represent, respectively B Elements and compounds A C Compounds and mixtures Elements and ions D Elements and mixtures

25. 24 What state of matter expands when it is heated and is easy to compress? C Gas A B Solid Liquid

26. 25 Two features that define matter are _____. C Mass and volume A B Weight and volume Mass and velocity D Weight and velocity

27. 26 A substance that can be changed into simpler substances by chemical means is a ______. A B C Product Mixture Element D Compound

28. 27 The substance produced in a chemical reaction is called a(n) ______. A product B C catalyst reactant D excess reagent

29. Indicate whether the following are physical (P) or chemical (C) properties of sulfur 28 Sulfur is a solid at room temp Sulfur is a poor conductor of electricity Sulfur combines with oxygen to produce sulfur dioxide 29 30 P C P

30. Indicate whether the following are physical (P) or chemical (C) changes 31 Pizza is cut into slices Aluminum and iodine react to produce aluminum iodide Water is boiled 32 33 P P C

31. Indicate whether the following are heterogeneous (HT) or homogeneous (HM) mixtures 34 Blueberry muffin Orange juice with extra pulp Blood 35 36 HT HM HT

32. Indicate whether the following are mixtures (M), elements (E) or compounds (C) 37 Propane (C 3 H 8 ) Ice cream Gold 38 39 C E M

33. What is one unique physical property of iron that allows it to be easily separated from a mixture? 40 Iron is magnetic