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Chemistry Unit 7

Vocabulary Words

TermDefinition
Hess' Law Overall enthalpy change in a reaction is equal to the sum of the enthalpy changes for the individual steps in the process.
Entropy measure of degree of randomness as particles move; more random = more entropy
Catalyst a substance that speeds up a chemical reaction, but is not consumed by the reaction
Reversible Reaction Products can react to re-form the reactants
Equilibrium Rate of forward reaction equals rate of reverse reaction and the concentrations of products and reactants remain unchanged
Activated Complex the maximum energy point along the reaction path
delta H (∆H) enthalpy of products - enthalpy of reactants
Endothermic Heat energy is absorbed; products higher
Exothermic Heat energy released; products lower
Collision Theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions
Enthalpy Change using Hess's law; process equals the sum of the energy difference of products minus the sum of the energy difference of the reactants
Activation Energy the minimum energy that must be input to a chemical system with potential reactants to cause a chemical reaction
Created by: khyia.gibbs
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