atom - the smallest component of an element, catalyst - substance that lowers activation energy for a quickerreaction, chemical change - occurs during a chemical reaction, chemical reaction - process by which 1 or more substances undergo change to produce something new, chemical formula - shorthand notation for a compound or diatomic element using chemical symbols and numbers, chemical equation - shorthand representation of a chemical reaction using chemcical formulas and numbers, reactants - the starting materials in a reaction, products  - the substances formed from a chemical reaction, law of conservation of mass - the law that states that mass is neither created nor destroyed, synthesis reaction - a reaction in which 2 or more substances combine to form a single compound, decomposition reaction - a reaction in which a single compound breaks down to form 2 or more simpler substances, single replacement reaction - a reaction in which an ion takes the place of another ion in a compound, double replacement reaction - a reaction in which ions in two compounds switch places, combustion reaction - a reaction in which a substance interacts with oxygen to give off heat, light while CO2 and H2O are produced,

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