Chemistry 100

Winter 2004 Homework Assignments

Chapter 1

1. What is chemistry?

Answer: The study of matter; it’s composition, structure, and transformation.

Questions

1. a) What is the difference between a hypothesis and a theory?

Answer: Both a hypothesis and a theory offer an explanation for an observed phenomena, but a hypothesis is tentative and a theory is supported by strong experimental evidence.

b) What is the difference between a law and a theory?

Answer: A law is a general restatement of observed phenomena, while a theory is an explanation of an observed phenomena.

2. phase = homogeneous part of a system separated from other parts by physical boundaries.

4. I test

6. a) solid has a definite shape because particles are close together in a rigid formation. Liquid particles are close together but move relative to one another.

b) gas particles have more space between them than those in a liquid, thus they are compressible.

c) Gasses are compressible because of space between particles.

8. In text.

10. Three phases. Solid and liquid (visible), gas because you smell it.

11. Heterogeneous, because 3 phases.

12. No. Can have more than one state of matter.

13. No, they could be dissolved in one another.