422-002+book+problems+chapter+1

Chapter 1 Problems 7. The composition of a pure compound differs from a mixture because a pure compound is homogeneous(composed of parts or elements that are all of the same kind) where a mixture is heterogeneous(composed of parts of different kinds).

9. Extensive properties are properties that change with the amount of matter where intensive properties don't.

10. a) A chemical property is a substance that has the ability to change and transform into a different substance. b) rusting, burning

11. physical change - the chemical stays the same but the appearance changes. chemical change - matter changes substance

13. a) a solid has a definite shape and volume and liquid has an indefinite shape and definite volume. b) liquid has an indefinite shape and definite volume where gas has an indefinite shape and volume.

14. The potassium and water are the reactants and the potassium hydroxide and hydrogen are the products.

15. The material is heterogeneous.

18. Element x is most likely a nonmetal and is located in group 14-18. Element z is most likely a metal and could be almost anywhere except for group 17 and 18.

19. a) potassium - metal b) silver - metal c) silicon - metalloid d) sodium - metal e) mercury - metal f) helium - nonmetal

21. a) group 14, period 2 b) group 18, period 3 c) group 6, period 4 d) group 2, period 6

22. Physical property - can be measured and observed without changing matter. ex. melting point, boliing point

1. C

9. B