| A | B |
|---|
| Matter | Anything that has mass and takes up space |
| Pure Substance | Matter that always has exactly the same composition |
| Element | A pure substance made up of atoms that are all alike |
| Atom | The smallest particle of an element |
| Compound | A substance in which the atoms of two or more elements are combined in a fixed proportion |
| Mixture | Matter composed of 2 or more different substances that can be separated by physical means |
| Heterogeneous mixture | A mixture in which different materials remain separate |
| Suspension | A heterogeneous mixture of a liquid and solid particles that settle out |
| Colloid | A heterogeneous mixture with particles that never settle out |
| Homogeneous mixture | A mixture that stays uniformly mixed and whose particles are so small they cannot be seen with a microscope |
| Solution | Another term for homogeneous mixture |
| Physical property | Any characteristic of a material that you can observe without changing the identity of a substance |
| Physical change | A change in size, shape, or state of matter in which the identity of the substance remains the same |
| Chemical property | Any characteristic of a material that you can observe that produces one or more new substances |
| Chemical change | When one substance becomes another substance |
| Precipitate | A solid that forms when two liquids are mixed |
| Law of Conservation of Mass | The mass of all substances before a chemical change must equal the mass of all substances after a chemical change |
| Kinetic Theory | Matter is made of constantly moving particles |
| State of Matter | The physical forms in which a substance can exist |
| Solid | The state of matter with a definite shape and definite volume |
| Liquid | The state of matter with an indefinite shape, but has a definite volume |
| Gas | The state with an indefinite shape and indefinite volume |
| Plasma | Like a gas, but made up of charged particles |
| Temperature | The measure of the average kinetic energy of the particles of a sample of matter |
| Heat of Fusion | The energy required to change a substance from a solid to a liquid at melting point |
| Vaporization | Changing from a liquid to a gas |
| Condensation | Changing from a gas to a liquid |
| Heat of Vaporization | The amount of energy required for the liquid at its boiling point to become a gas |
| Boiling | Vaporization throughout the entire liquid because it is all at the boiling point |
| Evaporation | Vaporization only at the surface, this occurs below the boiling point |
| Sublimation | Change from a solid to gas (directly) |
| Deposition | Change from a gas to solid (directly) |
| Thermal Expansion | An increase in the size of a substance when the temperature is increased |
