Chemical Reactions and Terms

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Reactant

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A chemical substance that is present at the start of a chemical reaction

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Product

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A substance formed as a result of a chemical reaction.

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Yield (Chemical Reaction)

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(chemistry) a process in which one or more substances are changed into other substances.

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Exothermic Reaction

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A chemical reaction in which heat is released to the surroundings

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Endothermic Reaction

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A chemical reaction that ABSORBS energy in the form of heat

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Balanced Chemical Equation

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Chemical equation with the same number of atoms of each element on both sides of the equation

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Coefficient

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A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

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Subscript

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A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a molecule or compound

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Energy of Activation (Activation Energy)

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The minimum amount of energy required to start a chemical reaction

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Ion

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An atom or group of atoms that has a positive or negative charge.