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Subscript

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A number written below and to the right of a chemical symbol that shows the number of atoms.

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Chemical Formula

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A shorthand notation that uses chemical symbols and subscripts to represent the type and number of atoms in the smallest unit of the substance.

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Chemical Reaction

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The process by which one or more substances get changed to produce one or more different substances.

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Chemical Equation

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Chemical formulas and symbols written to represent an entire reaction.

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Coefficient

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A number placed in front of a chemical symbol or formula in order to balance the equation.

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Balanced Chemical Equation

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A symbolic representation of a chemical reaction in which both sides of the equation contain equal numbers of atoms of each element. The mass must be balanced on both sides.

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Reactants

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Substances that take part in and get changed by a chemical reaction.

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Products

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Substances that are produced during a chemical reaction.

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Law of Conservation of Matter (Mass)

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The mass of all reactants must equal the mass of all products. Matter is neither created nor destroyed.

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Physical Change

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Affects size, shape, state of matter, or color of a substance, but does not turn it into a new substance.