Answer these questions before class on Wednesday, January 19th. Be sure to review these notes before answering.

Important do not press the enter key or the Return key while you are anwsering these questions. Your Browser will interpret either key the same as clicking the mouse on the Submit button. So BE CAREFUL!

First Name: Last Name:

Laboratory Section:

1. What is the difference between a mixture and a pure substance?

2. Why is a gas compressible and a liquid is not?

3. Here is a diagram like the ones in PS1.7. Categorize this diagram like the ones in PS1.7.

Category I:

Category II:

Category III: