CHEMISTRY energy changes 2.0 / 5 based on 1 rating ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEEdexcel Created by: Harry CodayCreated on: 26-09-12 20:54 Exothermic change: heat exits, temperature of surroundings increases. ▲H is negative BONDS ARE BROKEN 1 of 5 Endothermic change: heat is absorbed, temperature of surroundings drops, ▲H is positive BONDS ARE FORMED 2 of 5 Breaking bonds always requires energy Forming bonds always releases energy 3 of 5 At equilibrium, the concentrations do not change Equilibria can only exist in closed systems 4 of 5 Equilibria are dynamic ie. they do not stop At equilibrium therate of the formed reaction = rate of reverse reaction 5 of 5
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