1. Vocabulary Week 3

2. Atom
the basic unit of a chemical element.

3. Matter
anything that has mass and takes up space

4. Chemical Properties
a property or behavior of a substance when it undergoes a chemical change or reaction

5. Physical Properties
The measurement of a physical property may change the arrangement of matter in a sample, but not the structure of its molecules. 

6. Freezing
to be become a hard substance (such as ice) because of cold

7. Melting
to change or to cause (something) to change from a solid to a liquid usually because of heat

8. Evaporation
to change from a liquid into a gas

9. Condensation
the process by which a gas cools and becomes a liquid