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vocabulary 2
Term | Definition |
---|---|
pure substance | Matter that always has exactly the same composition. |
element | A substance that cannot be broken down into simpler substances. |
atom | 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 | The parts of the mixture are noticeably different from one another. |
homogeneous mixture | The substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another. |
solution | When substances dissolve and form a homogeneous mixture. |
suspension | 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 tendency of a liquid to keep from flowing-its resistance to flowing. |
conductivity | a materials ability to allow heat to flow. |
malleability | The ability of a solid to be hammered without shattering. |
melting point | The temperature at which a substance changes from a solid to liquid |
boiling point | the temperature at which a substance boils |
filtration | Process that separates materials based on the size of their particles. |
distillation | Process that separates the substances in a solution based on their boiling points |
physical change | Occurs when properties of 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 | materials ability to change in the presence of oxygen. |
reactivity | The property that describes how readily a substance combines chemically with other substances. |
Chemical change | substance reacts and forms one or more new substances. |
precipitate | any solid that forms and separates from a liquid |