reactant - the starting substance(s) in a chemical reaction; located on the left side of the chemical equation, product - the ending substance(s) in a chemical reaction; located on the right side of the chemical equation, coefficient - a number placed in front a a chemical symbol or formula in a chemical equation; used to balance a chemical equation, subscript - a small, lowered number written after a chemical symbol, catalyst - a substance that speeds up a chemical reaction, but is bot changed during the reaction, synthesis (combination) - a type of reaction that has a single product, decomposition - a type of reaction that has a single reactant, single displacement (replacement) - a type of reaction that has a single element and a compound as reactants that form a new single element and compound as products, double displacement - a type of reaction that has two ionic compounds as reactants that form two new compounds as products, combustion - a type of reaction has oxygen as a reactant, if a hydrocarbon is also a reactant, it produces energy, carbon dioxide and water, precipitate - a solid that forms from a reaction between aqueous solutions, aqueous solution - a mixture containing a substance dissolved in water,

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