Enthalpy (H), Total heat energy in a substance, ΔH, Energy change in a reaction, Exothermic reaction, Energy is released to surroundings, Endothermic reaction, Energy is absorbed from surroundings, Activation energy (Ea), Minimum energy to start a reaction, Catalyst, Lowers activation energy, Products (exothermic), Lower in energy than reactants, Products (endothermic), Higher in energy than reactants, Breaking bonds, Energy is absorbed, Forming bonds, Energy is released

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