| A | B |
|---|
| pure substance | Matter that always has exactly the same composition |
| element | A substance that cannot be broken down into simpler substance |
| atom | The smallest particle of an element |
| compound | A substance that is made from two or more simpler substances and can be broken down into those simpler substances |
| heterogeneous mixture | A type of a mixture in which the parts of the mixture are noticeably different from another |
| homogeneous mixture | A type of a mixture in which the substance are so evenly distributed that it is difficult to distinguish one substance in the mixture from another |
| solution | A mixture that forms when substances dissolve and forms a homogeneous mixture |
| suspension | A heterogeneous mixture that separates into layers over time |
| colloid | A mixture that contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension |
| physical property | Any characteristics of a material that can be observed or measured without changing the composition of the substance in the material |
| viscosity | The tendency of a liquid to keep from flowing; resistance to flowing |
| conductivity | A material's ability to allow heat or electric charges to flow |
| malleability | The ability of a solid to be hammered without shattering |
| melting point | The temperature at which a substance changes from solid to liquid |
| boiling point | The temperature at which a substance boils; the temperature at which vapor pressure is equal to atmospheric pressure |
| filtration | A process that separates materials based on the size of their particles |
| distillation | A process that separates the substance in a solution based on their boiling points |
| physical change | A change that occurs when some properties of a material change, but the substances in the material stay the same |
| chemical property | Any property that produces a change in the composition of matter |
| flammability | A material's ability to burn in the presence of oxygen |
| reactivity | The property that describes how readily a substance combines chemically with other substances |
| chemical change | Change that occurs when a substance reacts and forms one or more new substances |
| precipitate | A solid that forms and separates from a liquid mixture |
