| Question | Answer |
|---|---|
| Thermal Energy | the kinetic energy of the moving particles in a substance or an object. |
| solid | Firm and stable in shape; not liquid or fluid. |
| Liquid | having a consistency like that of water or oil, i.e., flowing freely but of constant volume. |
| Gas | an airlike fluid substance which expands freely to fill any space available, irrespective of its quantity. |
| Plasma | A state of matter made up of charged atoms, uncharged atoms, and free electrons. |
| Colloid | A mixture that contains particles that are to small see. |
| Phase Change | When temperature changes, matter can undergo a phase change, shifting from one form to another. |
| Particle | a minute quantity or fragment. |
| Melting point | The temperature at which a substance changes from a solid to liquid. |
| Freezing point | The temperature at which a liquid changes into a solid. |
| Boiling point | The temperature at which a substance changes from a liquid to a gas. |
| Evaporation | The process by which a liquid changes into a gas. |
| Condensation | The process by which water vapor changes into liquid water. |
| Volume | The amount of space something takes up. |
| Mass | The amount of matter something has. |
| Density | The amount of mass something has in relation to its volume. |
| Pure substance | A material that is composed of only one type of particle. A material made up of at least two different pure substances. |
| Atom | The smallest unit of an element that still has the properties of that element. |
| Molecule | A molecule is the smallest particle in a chemical element or compound. Molecules are made up of atom s that are held together by chemical bonds. |
| Element | A substance made up of only one kind of atom. |
| Compound | A substance made up of atoms of two or more elements that are chemically combined. |
| Extended structure | |
| Physical change | A change that does not make a substance into a new substance. |
| Chemical change | A change in which one or more new substances are formed. |
| Natural resource | A material that occurs in nature that is essential or useful to people. |
| Synthetic material | Synthetic fabrics are textiles made from man-made rather than natural fibers. |
