States of matter

1. As of the 1990s, scientists have proved the existence of how many states of matter?

Three b) Four c) Five

2. When a substance goes from being a solid to a liquid, it is a...chemical change b)physical change

3. Which of these choices will NOT change the state of matter?a) temperature b) crushing a crystal c) pressure d) electricity

4. Of gases, liquids, and solids, what is the densest state of matter? ________

5. You may find plasma in a star.a)true b)false

6. What is the term used to describe the phase change as a liquid becomes a solid?

a) evaporation b)condensation c)freezing