| Term | Definition |
|---|
| matter | anything that has mass and takes up space |
| Physical property | can be observed without changing a substance into another substance |
| Chemical property | describes the ability of a substance to change into a different substance |
| Element | a pure substance that cannot be broken down into any other substance by chemical or physical means. |
| Atom | the basic particle of an element. |
| Molecule | a particle formed when two or more atoms are held together by chemical bonds. |
| Chemical formula | shows the elements in the compound and the ratio of atoms. |
| Mixture | is two or more substances that are together in the same place but are not chemically combined. |
| Homogeneous mixture | The substances are so evenly mixed that the different parts cannot be seen. |
| Heterogeneous mixture | The different parts can be seen. |
| Weight | a measure of the force of gravity on an object |
| Mass | measurement of how much matter an object contains |
| Volume | the amount of space that matter takes up |
| Density | a measurement that relates the volume and mass of an object |
| Law of conservation of mass | states that matter is not created or destroyed in any chemical or physical reaction. |
| Thermal energy | the total energy of all the particles in an object. |
| Endothermic change | a change in which energy is taken in, or absorbed |
| Exothermic change | a change of energy that releases or gives off energy |
| Solid | a kind of matter that has a fixed shape and a fixed volume |
| Liquid | a kind of matter that has a fixed volume. |
| Gas | a kind of matter that easily changes volume and shape. |
| Melting | the change in state from solid to liquid |
| Melting point | the temperature at which a substance changes state from a solid to a liquid |
| Freezing | the change in state from liquid to solid |
| Freezing point | is the specific temperature a substances changes states from a liquid to a solid |
| Vaporization | the change in state from liquid to gas |
| Boiling | change in state from a liquid to a gas throughout the liquid |
| Boiling point | the temperature at which a liquid boils |
| evaporation | liquid changing to gas (vaporization) only at the surface |
| Condensation | the change in state from gas to liquid |
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