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Chemical reactions

TermDefinition
chemical reaction A process in which atoms of one or more substances rearrange to form one or more new substances.
chemical equation A description of a reaction using element symbols and chemical formulas.
reactants The starting substances produced by the chemical reaction.
products The substances produced by the chemical reaction.
law of conservation of mass States that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.
coefficient A number placed in front of an element symbol or chemical formula in an equation.
decomposition One compound breaks down and forms two or more substances.
endothermic reaction Chemical reactions that absorb thermal energy. (cold)
exothermic reaction Chemical reaction that releases thermal energy.
What happens during a chemical change? A NEW substance is produced.
what happens during a physical change? The original substance still exists but physically is changed.
Precipitate a solid formed from a liquid during a chemical reaction
Created by: KallyEvans
 

 



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