Chemical Reactions Vocabulary

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Physical change

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A change that affects the size, shape, or state of a substance but does not make a new substance.

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Chemical change/chemical reaction

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A process where one or more substances change into new substances with different properties.

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Precipitate

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A solid that forms when two liquids are mixed together during a chemical reaction.

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Endothermic reaction

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A chemical reaction that takes in heat, causing the temperature to drop.

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Exothermic reaction

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A chemical reaction that gives off heat, causing the temperature to rise.

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Chemical equation

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A written way to show what happens during a chemical reaction. It uses chemical formulas to show the reactants and products and an arrow (→).

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Reactant

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The starting materials in a chemical reaction. They are found on the left side of the arrow in a chemical equation.

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Product

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The new substances formed during a chemical reaction. They are found on the right side of the arrow in a chemical equation.

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Coefficient

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The big number in front of a chemical formula that shows how many molecules are involved.

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Subscript

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The small number written after an element’s symbol that shows how many atoms of that element are in one molecule.