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a solid that forms from a solution during a chemical reaction

endothermic reaction

A reaction that absorbs energy in the form of heat

exothermic reaction

a reaction that releases energy in the form of heat

chemical equation

a short, easy way to show a chemical reaction, using symbols instead of words


a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound


a substance that enters into a chemical reaction


A substance formed as a result of a chemical reaction.

conservation of mass

the principle stating that matter is not created or destroyed during a chemical reaction


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


a chemical reaction in which two or more simple substances combine to form a new, more complex substance


a chemical reaction that breaks down compounds into simpler products.

replacement reaction

A reaction in which one element replaces another in a compound; or in which two elements in different compounds trade places.

activation energy

the minimum amount of energy needed to start a chemical reaction


the amount of one material dissolved in a given amount of another material


a material that increases the rate of a reaction by lowering the activation energy


a biological catalyst that lowers the activation energy of reactions in cells


a material used to decrease the rate of a reaction


a rapid reaction between oxygen and fuel that produces thermal energy


A material that releases energy when it burns

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