Chemistry Concepts

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Valence electrons

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The electrons in the outermost energy level of an atom

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Chemical Reaction

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The process of breaking chemical bonds in one or more substances and the reforming of new bonds to create new substances.

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Covalent Bond

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A chemical bond formed by atoms that are sharing one or more electrons.

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Ionic Bond

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A bond that transfers one or more electrons from one atom to another.

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Lewis Dot Diagram

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A method for representing an atom's valence electrons using dots around the element symbol.

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Chemical Bond

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A bond that forms when atoms transfer or share electrons.

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Precipitate

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A solid that forms and is insoluble in a reaction mixture.

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Reactants

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A starting ingredient in a chemical reaction.

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Chemical Formula

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A representation of a compound that includes the symbols and ratios of atoms of each element in the compound.

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Ion

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An atom or group of atoms that has an electric charge other than zero, created when an atom (or group of atoms) gains or loses electrons.