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18 Cards in this Set

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Chemical equation
shorter, easier way to show chemical reactions, using symbols instead of words
Symbol
a one or two letter set of characters that is used to identify elements
Chemical formula
a combination of symbols that represent the elements in a compound
subscript
a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
reactant
a substance that enters into a chemical reaction
product
a substance formed as a result of a chemical reaction
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 a reaction
synthesis
a chemical reaction in which two or more simple substances combine to form a new, more complex substance
decomposition
a chemical reaction that breaks down a compound into simpler products
replacement reaction
a reaction in which one element replaces another in a compound; or when two elements in two compounds trade places
exothermic reaction
a reaction that releases energy in the form of heat
activation energy
the minimum amount of energy that has to be added to get a chemical reaction started
concentration
the amount of one material in a certain volume of another material
catalyst
a material that increases the rate of a chemical reaction by lowering the activation energy
enzymes
a biological catalyst that lowers the activation energy of reactions in cells
inhibitor
a material that decreases the rate of a reaction
combustion
a rapid reaction between oxygen and fuel that produces thermal energy
fuel
a material that releases energy when it burns