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23 Cards in this Set
- Front
- Back
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pure substance |
matter that always has the same composition and properties |
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element |
substance that cannot be broken down into simpler substances with a fixed composition |
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atom |
smallest particle of an element |
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coupond |
substance made from multiple simpler substances and can be broken down to form simpler substances` |
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heterogeneous mixture |
parts of mixture are visibly different from one another |
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homogeneous mixture |
substances are evenly distributed and difficult to distinguish |
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solution |
when substances dissolve and form a homogeneous mixture |
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suspension |
heterogeneous mixture that separates into layers over time |
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colloid |
contains some particles that are intermediate in size without layers |
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physical properties |
any characteristic of a material that can be observed without a change in composition |
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viscosity |
the tendency of a liquid to resist flowing |
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conductivity |
a materials ability to allow heat to flow |
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malleability |
the ability of a solid to be hammered without shattering |
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melting point |
solids change to liquids |
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boiling point |
the temperature when a liquid boils |
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hardness |
see what substance scratches another |
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density |
mass divided by volume |
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physical change |
properties change, substances stay the same, change in size or shape |
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chemical property |
a change of composition in matter |
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flammability |
ability to burn in oxygen |
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reactivity |
how fast substances combine chemically |
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chemical change |
a substance reacts chemically forming a new substance |
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precipitate |
any solid that separates from a liquid |
