| A | B |
|---|
| atom | smallest piece of matter |
| liquid atoms | the atoms are loose enough to slide past each other easily |
| solid atoms | the atoms are very tightly packed together |
| gas atoms | the atoms are spread far apart |
| add heat | this causes atoms to spread apart |
| remove heat | this causes atoms to join together tightly |
| mixture | two or more substances that are easy to separate |
| solution | one substance dissolves inside of another substance |
| element | a group of atoms that are all the same kind |
| compound | a group of atoms that are different types joined together |
