| A | B |
|---|
| pure substance | a substance that has a fixed composition and differs from a mixture in that every sample of a given pure substance has exactly the same characteristic properties and composition |
| mixture | a blend of two or more kinds of matter, each of which retains its own identity and properties |
| element | a pure substance made of only one kind of atom |
| compound | a substance that is made from the atoms of two or more elements that are chemically combined |
| heterogeneous | not having a uniform composition throughout |
| atom | the smallest unit of an element that maintains the properties of that |
| homogeneous | having a uniform composition throughout |
| physical separation | can be used to separate mixtures |
| chemical separation | can be used to separate elements in a compound |
