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Chemical reactions quiz
key terms
15
Chemistry
8th Grade
12/07/2014

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Term
chemicals
Definition
any substance that has a definite composition
Term
elements
Definition
a pure substance that CANNOT be broken down into simpler substances
Term
compounds
Definition
a pure substance composed of 2 or more elements that are chemically bonded, and can be separated by a chemical reaction
Term
chemical reactions
Definition
the reaction of chemicals physically or chemically bonded together
Term
initial energy
Definition
the initial amount of energy in a chemical reaction
Term
activation energy
Definition
the amount of energy needed to produce a chemical reaction
Term
final energy
Definition
the amount of energy after a chemical reaction
Term
ΔE
Definition
the change amount of change between the initial and final energy
Term
synthesis
Definition
when 2 elements (or compounds) combine to make a new and different compound
Term
single replacement
Definition
when one component of the reactants trades places with another
Term
double replacement
Definition
when 2 components on the reactant side trade places with each other
Term
decomposition
Definition
when 1 compound splits into 2 different elements (or compounds) -opposite of synthesis
Term
combustion
Definition
when reactants containing carbon and oxygen yield to a product that contains CO2 and H2O
Term
endothermic reactions
Definition
a type of reaction that results in the final energy being greater than the initial energy, causing the ΔE to be positve
Term
exothermic reactions
Definition
a type of reaction that results in the final energy being lower than the activation energy, causing the ΔE to be negative
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