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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. |