Unit 2: Chemical Reactions

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Chemical equation

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A representation of a chemical reaction using chemical symbols, numbers, and a symbol ( → ).

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Chemical reaction

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The rearrangement of atoms to form new substances with different properties.

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Law of conservation of mass

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A scientific law that states that matter cannot be created or destroyed; the atoms that make up matter can only be rearranged into different combinations.

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Atom

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The smallest unit of matter that retains the chemical identity of the element.

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Chemical change

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A type of change in which a new substance is made from one or more previous substances; occurs during a chemical reaction; a change where the atoms of the original substances are rearranged to make new elements and/or compounds.

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Chemical formula

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Represents the type and number of atoms present in a particular substance.

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Coefficient

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A whole number written in front of a chemical formula that indicates how many molecules of that substance are involved in a chemical reaction.

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Compound

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A pure substance that is made up of two or more different elements in a specific ratio.

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Element

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A pure substance that is made up of one type of atom.

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Molecule

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Refers to the simplest unit of a chemical compound that can exist; formed when two or more atoms of any element combine chemically.