chemical energetics

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Last updated 10:33 AM on 4/28/26
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15 Terms

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Exothermic reaction definition

releases heat to surroundings (temperature increases)

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Endothermic reaction definition

absorbs heat from surroundings (temperature decreases)

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Enthalpy change (ΔH) definition

heat energy change during a reaction

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ΔH sign (exothermic)

negative

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ΔH sign (endothermic)

positive

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Activation energy definition

minimum energy needed for reaction to occur

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Bond breaking

requires energy (endothermic)

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Bond making

releases energy (exothermic)

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Overall energy change

depends on bond breaking vs bond making

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Bond energy calculation

ΔH = energy in − energy out

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Exothermic explanation

more energy released than absorbed

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Endothermic explanation

more energy absorbed than released

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Reaction pathway diagram features

reactants products Ea ΔH

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Catalyst effect

lowers activation energy

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Effect of catalyst

speeds up reaction without being used up