Chemical Bonds and Reactions

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Covalent Bond

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A bond in which electrons are shared between the bonded atoms.

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Ionic Bond

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The force of attraction between a charged atom (or group of connected atoms) and another with the opposite charge.

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Valence Electrons

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The electrons in the outermost shell of an atom.

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Combustion Reaction

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An exothermic reaction in which oxides are usually formed.

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Decomposition Reaction

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A kind of chemical reaction in which a single compound is broken down into two or more simpler compounds.

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Endothermic Reaction

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A chemical reaction in which energy is absorbed from its surroundings.

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Exothermic Reaction

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A chemical reaction in which energy is released to its surroundings.

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Precipitate

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A solid that forms as a result of a chemical reaction. A white solid precipitate may form when aluminum chloride is added to a substance that contains aluminum.

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Product

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The molecules that result from a chemical reaction.

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Reactants

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The starting molecules in a chemical reaction.