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| Chemistry | study of the composition, structure, and properties of matter and the changes that matter undergoes |
| Matter | anything that has mass and takes up space |
| Element | a substance that cannot be seperated or broken down into simpler substances by chemical means |
| Atom | the smallest unit of an element that maintains the properties of that element |
| Compound | a substance made of atoms of two or more different elements that are chemically combined |
| Molecule | the smallest unit of a substance that keeps all of the physical and chemical properties of that substance |
| Chemical Formula | a combination of chemical symbols and numbers to represent a substance |
| Pure Substance | a sample of matter, either a single element or a single compound, that has definite chemical and physical properties |
| Mixture | a combination of two or more substances that are not chemically combined |
| Melting Point | the temperature and pressure at which a solid becomes a liquid |
| Boiling Point | the temperature at which a liquid becomes a gas |
| Density | the ratio of the mass of a substance to the volume of a substance |
| Reactivity | the ability of a substance to combine chemically with another substance |
| Flammability | the ability of a substance to react in the presence of oxygen and burn when exposed to a flame |
| Physical Change | a change of matter from one form to another without a change in chemical properties |
| Chemical Change | a change that occurs when a substance changes composition by forming one or more new substances |
| Plasma | a state of matter that starts as a gas and then becomes ionized |
| Energy | the capacity to do work |
| Thermal Energy | Heat energy due to fast moving atoms |
| Evaporation | the change of a substance from a liquid to a gas |
| Sublimation | the process in which a solid changes directly into a gas |
| Condensation | the change of a substance from a gas to a liquid |
| Viscosity | the resistance of a gas or liquid to flow |
