| Term | Definition |
|---|
| Weight | is a measure of the force of gravity on you. |
| Mass | of an object is the measurement of how much matter it contains. |
| Internal Systems of Units | are the units that scientists use to measure matter. |
| Volume | is the amount of space that matter occupies. |
| Density | relates the mass and volume of an object or material. To calculate density of a sample, divide its mass by its volume. |
| Atoms | are the smallest particles of an element. |
| John Dalton | thought that atoms were like tiny marbles, or rigid spheres that are impossible to break. |
| Molecule | is a group of atoms that are joined together and act as a single unit. |
| Chemical bond | is the force that holds two atoms together. |
| Ore | is any rock that contains a metal or other economically useful material. |
| Electrolysis | is a process by which an electric current breaks chemical bonds. |
| Electrodes | are a metal strip that conducts electricity; often used in the electrolysis process. |
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