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Ch.1 (C.I.)Voc Terms

Vocabulary Terms For Ch.1 (C.I.)

chemistry The study of the properties of matter and its changes.
precipitate A solid that forms from a solution during a chemical reaction.
chemical equation A short, easy way to show chemical reactions, using symbols instead of words.
chemical formula A combination of symbols that represent the elements in a compound.
coefficient A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in the reaction.
conservation of mass The principle that states that matter is not created or destroyed during a chemical reaction.
decomposition A chemical reaction that breaks down compounds into simpler substances or products.
product A substance formed as a result of a chemical reaction. (Found on the right side of an equation.)
reactant A substance that is present at the beginning, or enters into a chemical reaction. (Found on the left side of an equation.)
replacement reaction A reaction in which one element replaces another in a compound; or when two elements in different compounds trade places.
subscript A number in a chemical formula, usually small, and written to the bottom right of a symbol, that tells the number of atoms in a molecule, or the ratio of elements in a compound.
synthesis A chemical reaction in which two or more elements combine to form a new, more complex substance.
activation energy The minimum amount of energy needed to get a chemical reaction started.
catalyst A material or substance that increases, or speeds up the rate of a chemical reaction by lowering the amount of activation energy needed.
concentration The amount of one material present in a certain volume of another material.
endothermic reaction A reaction that absorbs energy in the form of heat. (A cooling off reaction.)
enzyme A biological catalyst that lowers the activation energy of reactions in cells and speeds up the reaction.
exothermic reaction A reaction that releases energy in the form of heat. (A heating up reaction.)
inhibitor A material that decreases or slows down the rate of a chemical reaction, and increases the amount of activation energy needed.
combustion A rapid reaction between oxygen and a fuel that results in a fire.
fuel A material that releases energy when it burns.
Created by: LarryMoran