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Chapter 2 Vocabulary
Science
| Term | Definition |
|---|---|
| pure substance | Matter that always has exactly the same composition. |
| element | A substance that cannot be broken down into simpler substances. |
| atom | The smallest particle of an element. |
| compound | A substance that is made up from two or more simpler substances. |
| heterogeneous mixture | Parts of a mixture that are noticeably different from one another. |
| homogeneous mixture | Substances that are so evenly distributed that it is difficult to distinguish one substance in the mixture from another. |
| solution | The mixture that forms in a homogeneous mixture. |
| suspension | A heterogeneous mixture that separates into layers over time. |
| colloid | 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 tenancy for a liquid to resist flowing. |
| conductivity | A materials ability to allow heat to flow. |
| malleability | The ability for a solid to be hammered without shattering. |
| melting point | The temperature at which a substance changes from a solid to a liquid. |
| boiling point | The temperature at which a substance boils. |
| 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 | Occurs when some of the properties in a material change, but the substances in the material remain the same. |
| chemical property | Any ability to produce 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 | Occurs when a substance reacts and forms one or more new substances. |
| precipitate | Any solid that forms and separates from a liquid mixture. |