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Reactants

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Substances that start a chemical reaction.

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Products

Back

Substances that are produced in a chemical reaction.

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Atoms

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The basic unit of a chemical element.

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Elements

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Pure substances consisting of only one type of atom.

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Molecules

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Two or more atoms bonded together.

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Compounds

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Substances formed when two or more elements are chemically bonded together.

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Coefficient

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A number placed in front of a chemical formula to balance a chemical equation.

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Subscript

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A number written slightly below and to the right of a chemical symbol, indicating the number of atoms of an element in a molecule.

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Combustion Reaction

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A chemical reaction that occurs when a substance reacts with oxygen, releasing energy, CO2 & H2O.

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Double Replacement Reaction

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A chemical reaction where two compounds exchange ions to form two new compounds.