| A | B |
|---|
| Pure Substance | A type of matter with a fixed composition |
| Element | A pure substance in which all of the atoms have the same identity |
| Compound | A pure substance in which the atoms of two or more elements are combined in fixed proportions |
| Molecule | A particle consisting of two or more atoms that are bonded together |
| Mixture | A material made up of two or more substances that can be easily separated by physical means |
| Heterogeneous Mixture | A mixture in which different materials can be distinguised easily |
| Homogeneous Mixture | A mixture in which two or more substances are blended evenly throughout |
| Colloid | A heterogeneous mixture with particles that are not heavy enough to settle out; a light beam can be seen as it passes through |
| Tyndall Effect | Scattering of light by colloidal particles |
| Suspension | A heterogeneous mixture in which visible particles settle |
| Solution | A homogeneous mixture with particles so small that cannot be seen and will never settle to the bottom |
| Physical Property | A characteristic of a material that you can observe without changing the identity of the substances that make up the material |
| Physical Change | A change in size, shape, or state of matter |
| Distillation | The process used for separating substances in a mixture by evaporating a liquid and recondensing its vapor |
| Chemical Property | A characteristic of a substance that indicates whether it can undergo a certain chemical change |
| Chemical Change | A change of one substance to another |
| Law of Conservation of Mass | The mass of all substances that are present before a chemical change equals the mass of all the substances that remain after the change |
| Chromatography | A process used to separate mixtures |
