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The energy released by a chemical reaction is determined by the change in Gibbs free energy. For the chemical reactions involved in fuel cells the maximum theoretical efficiency is over 85% which is between two and three times the typical efficiency of a heat engine.

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Apr 07, 2016 · 7. A potential energy diagram of a chemical reaction is shown. What is the di erence between the potential energy of the reactants and the potential energy of the products? A. 20.kcal B. 40.kcal C. 60.kcal D. 80.kcal 8. What happens when two oxygen atoms combine to form a molecule of oxygen? A. Chemical bonds are broken and energy is absorbed.

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This potential energy calculator enables you to calculate the stored energy of an elevated object. The full name of this effect is gravitational potential energy because it relates to the energy which is stored by an object as a result of its vertical position or height.

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The activation energy is the minimum amount of energy needed for the reaction to occur. A catalyst can work by lowering the activation energy for a reaction. Going from the top of the curve to the products, we are going down the energy axis of the graph. Energy (heat) is given out as bonds form in the products. The reactants are higher up the ...

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Apr 29, 2014 · The diagram below represents a potential energy diagram of a chemical reaction. The graph below represents the potential energy changes that occur in a chemiCal reaction. (a) (b) (c) Reacäon Coordinate AccordinŒ to the graph, is energy absorbed or released durincr the action? Which lettere interv represents the AH of the reaction?

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Energy factor - enough energy in the collision for the formation of an activated complex, where bonds are breaking and new ones forming. When temperature is increased, a greater number of molecular collisions possess enough energy to activate the reaction (activation energy). Bringing the atoms closer to one another has an attractive potential and the bond has formed on reaching the lowest point on your curve. Moving the atoms closer together increases the potential energy because here we push electrons closer to one another and this energy increases rapidly with each small decrease in separation due to repulsion of ...