Pure substances

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5 Terms

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a pure substance
only contains one type of element or compound. e.g pure water only contains H2O
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What are elements made up of?
One type of atom only
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Compounds
2 or more elements that are chemically joined together
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Mixtures
2 or more elements or compounds that are not chemically joined together
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What can be said about pure substances melting points compared to impure substances?
Pure substances have a sharp melting point. Impure substances melt over a range of temperatures