Flashcards · 5070 · Topic 5

Chemical energetics flashcards

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Exothermic reaction: Transfers thermal energy to the surroundings, so the temperature of the surroundings rises.
Endothermic reaction: Takes in thermal energy from the surroundings, so the temperature of the surroundings falls.
On a reaction pathway diagram, how can you tell a reaction is exothermic?: The products are at a lower energy level than the reactants.
Sign of ΔH for exothermic and endothermic reactions: Exothermic: ΔH is negative. Endothermic: ΔH is positive.
Activation energy, Eₐ: The minimum energy that colliding particles must have to react.
Bond breaking and bond making: which is endothermic?: Bond breaking is endothermic; bond making is exothermic. ΔH = energy to break bonds − energy released making bonds.