| A | B |
|---|
| states of matter | Any of the three forms that matter may take:solid, liquid, gas |
| solid | Matter that has a definite volume and definite shape. |
| liquid | The state of matter that has a definite volume but no definite shape. |
| gas | The state of matter that has no definite shape or volume. |
| atom | The smallest part of an element that still has the properties of that element. |
| element | Matter made up of only one kind of atom. |
| energy | The ability to cause change. |
| chemical formula | A group of symbols that shows the kind and number of each element in a single unit of a compound. |
| substance | A class of matter made up of elements and compounds. |
| chemical symbol | One or two letters that stand for the name of an element. |
| melting | The change of state from solid to a liquid. |
| evaporation | The change of state from a liquid to a gas. |
| compound | Matter made up of two or more elements chemically combined. |
| condensation | The change of state from a gas to a liquid. |
| freezing | The change of state from a liquid to a solid. |
| boiling | The rapid change of state from a liquid to a gas. |
