How does a catalyst affect the net difference in energy between reactants and products?
It depends on the reaction? Or it decreases ? Or have no effect?
No effect. It lowers the activation energy by providing an alternative route for the reaction but enthalpies of products and reactants remain the same.
A catalyst is a chemical substance that affects the rate of a chemical reaction by altering the activation energy required for the reaction to proceed. This is called catalysis. There is no effect on the energy of the reactants or the products. The ΔH for the reactions is the same. Hope that I have answered correctly your question. click here, buy targeted youtube views