Chemistry Concepts

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Matter

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Anything that has mass and takes up space.

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Element

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A pure substance made of only one kind of atom.

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Compound

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A substance made from two or more elements chemically combined.

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Mixture

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Two or more substances physically combined, not chemically.

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Law of Conservation of Matter

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Matter cannot be created or destroyed in a chemical reaction.

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Ions

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Positively charged ions: cations. Negatively charged ions: anions.

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Isotopes

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Atoms of the same element with different numbers of neutrons.

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Mass Number

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Total number of protons and neutrons in an atom.

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Average Weighted Mass

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The average mass of an element's isotopes.

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Energy Levels

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The regions around the nucleus where electrons are likely to be found.