| A | B |
|---|
| matter | Anything that has mass and occupies space. |
| element | A substance that cannot be broken down into other substances by chemical or physical means. |
| atom | The smallest particle of an element. |
| symbol | Usually one- or two-letter set of characters that is used to identify an element. |
| compound | A substance made of two or more elements chemically combined. |
| formula | A combination of symbols that shows the ratio of elements in a compound. |
| mixture | Two or more substances that are mixed together but not chemically combined |
| physical change | A change that alters the form or appearance of a substance but does not make the material into another substance. |
| chemical change | A change in matter that produces new substances |
| chemical reaction | A process in which substances undergo chemical changes |
| weight | A measure of the force of gravity on an object. |
| mass | A measure of how much matter is in an object. |
| volume | The amount of space that matter occupies |
| density | The measurement of how much mass of a substance is contained in a given volume. |
| International System of Units (SI) | A system of measurement based on multiples of ten and on established measures of mass, length, and time. |
| chemical bond | The force that holds two atoms together. |
| molecules | A combination of two or more atoms that are bonded together |
