| A | B |
|---|
| pure substance | matter that always has exactly the same composition; an element or compound |
| element | a substance that cannot be broken down into simpler substances |
| 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 |
| heterogenous mixture | a type of mixture in which the parts of the mixture are noticeably different from one another |
| homogenous mixture | a type of mixture in which the substances 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 form a homogenous mixture |
| suspension | a heterogenous 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 characteristic of a material that can be observed or measured without changing the composition of the substances in the material |
| viscosity | the tendancy 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 substances 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 |
