| A | B |
|---|
| chemistry | the study of matter and how it changes |
| matter | anything that has mass and occupiesspace |
| element | a substance that cannot be broken down into simpler substances |
| atom | the smallest particle that has the properties of an element |
| compound | a substances made of atoms of more than one element bound together |
| molecule | the smallest unit of a substance that exhibits all of the properties characteristic of that substance |
| chemical formula | the chemical symbols and numbers indicating the atoms contained in the basic unit of a substance |
| pure substance | any matter that has a fixed composition and definite properties. |
| mixture | a combination of more than one pure substance |
