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I know that catalysts speed up a reaction, but never affect the equilibrium constant or the yield of a product, and that it helps to lower the activation energy of a reaction allowing more particles to overcome it and react. But does a catalyst alter the energy released from a reaction, the ΔH of a reaction? |
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Nope. The ΔH is the difference between the energy of the products, and the energy of the reactants. Since the reaction is still the same, the reactants and products are the same. And hence, the ΔH is the same! What does change is the activation energy (as you said). So the hump in the middle of the reaction is lower, but the starting and ending points are the same!
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