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Chapter 12 Science Vocabulary Review
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A substance that slows, or even stops, a chemical reaction.
 
inhibitor
 
enzyme
 
catalyst
 
hydrogen peroxide
A catalyst that speeds up chemical reactions in living cells.
 
enzyme
 
catalyst
 
inhibitor
 
concept
A substance that increases the reaction rate by lowering the activation energy of a reaction.
 
catalyst
 
enzyme
 
inhibitor
 
graphic
The minimum amount of energy needed to start a chemical reaction.
 
activation energy
 
reaction energy
 
concentration
 
temperature
A chemical reaction that releases thermal energy.
 
exothermic reaction
 
endothermic reaction
 
energy
 
reactants
Chemical reactions that absorb thermal energy.
 
endothermic reactions
 
thermal energy
 
exothermic reactions
 
combustion
A chemical reaction in which a substance combines with oxygen and releases energy.
 
combustion
 
decomposition
 
synthesis
 
contrast
A chemical reaction where the negative ions in 2 compounds switch places, forming 2 new compounds.
 
double replacement
 
single replacement
 
combustion
 
synthesis
A type of chemical reaction where 1 element replaces another element in a compound.
 
single replacement
 
double replacement
 
triple replacement
 
combustion
A type of reaction where 1 compound breaks down and forms 2 or more substances.
 
decomposition
 
synthesis
 
atoms
 
reactant
A type of chemical reaction in which 2 or more substances combine and form 1 compound.
 
synthesis
 
compound
 
substances
 
decomposition
A number placed in front of an element symbol or chemical formula in an equation.
 
coefficient
 
equation
 
number
 
foldable
The total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.
 
law of conservation of mass
 
chemical reaction
 
chemical equation
 
endothermic
The substances produced by the chemical reaction.
 
products
 
reactants
 
oxygen
 
carbon dioxide
The starting substance in a chemical reaction.
 
reactants
 
products
 
chemical equation
 
catalyst
A description of a reaction using element symbols and chemical formulas.
 
chemical equation
 
chemical reaction
 
synthesis
 
combustion
A process in which atoms of 1 or more substances rearrange to form 1 or more new substances
 
chemical reaction
 
activation energy
 
coefficient
 
inhibitor
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