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A thing that is composed of two or more separate elements.

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An element is a substance whose atoms all have the same number of protons.

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Tap water and rain water are both homogeneous.

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Ice cubes in a drink, and sand and water are both heterogeneous mixtures.

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Hydrogen, helium, oxygen, nitrogen, and carbon.

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Pure water is a compound made from two elements, hydrogen and oxygen. Pure table salt is a compound made from two elements - sodium and chlorine.

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A heterogeneous mixture has components whose proportions vary throughout the sample.

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A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample.

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Any substance that has a uniform and unchanging composition is considered to be pure.

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Substances that are made of only one type of atom or only one type of molecule.