| A | B |
|---|
| matter | anything that has mass and takes up space (has volume) |
| chemistry | the study of the properties of matter and how matter changes |
| molecule | groups of two or more atoms (elements) held together by chemical bonds |
| substance | a single kind of matter that is pure; always has a specific makeup or composition and a specific set of properties |
| physical property | a characteristic of a pure substance that can be observed without changing it into another substance |
| chemical property | a characteristic of a pure substance that describes its ability to change into different substances |
| element | a pure substance that cannot be broken into any other substances by chemical or physical means; the simplest substances |
| atom | the basic particle from which all elements are made; the basic particle of all matter; the "basic building block" of matter |
| chemical bond | a force of attraction between two atoms; forms compounds; forms molecules |
| compound | a pure substance made of two or more elements chemically combined in a set ratio |
| chemical formula | represents the elements in a compound and the ratio of atoms; examples - NaCl or HCl |
| mixture | made of two or more substances - elements, compounds, or both - that are together in the same place but are not chemically combined |
