Chemical Reactions (CR)

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12 Terms

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chemical equation

a symbolic representation of a chemical reaction

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coefficient

the number in front of a chemical formula that represents the number of particles or moles

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law of conservation of mass

a scientific law in which a total amount of a mass remains constant

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mole

unit of amount of substance

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product

substances present after a chemical reaction

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reactant

substances present before a chemical reaction

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molar ratio

ratio of moles of two substance involved in a chemical reaction

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physical change

a change in which the particles remain the same

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chemical change

a change in which the particles are rearranged to make new particles

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chemical formula

a set of chemical symbols showing the elements present in a compound and their relative proportions

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chemical symbol

shorthand method of representing an element

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subscript

number written below the line representing the number of atoms of the element