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An overview of potential energy diagrams, their purpose, and how they help determine if a chemical reaction is exothermic or endothermic. Learn about the role of reactants and products, activation energy, and calculating ΔH.
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Note the REACTANTS and PRODUCTS are labeled. The reactants are higher in energy (higher on y axis) then products, indicating energy is released (lost) as chemical reaction occurs, so this is an exothermic reaction. ΔH is the total energy change (enthalpy) of the reaction. ΔH is the difference in energy between the reactants and products. Is the ΔH of this reaction + or -?
What would an endothermic reaction look like? An endothermic reaction would show a gain in energy, meaning the products have more energy then the reactants. Is the ΔH of this reaction + or -?
What does A represent? What does B represent? What does E represent? How would you calculate ΔH?
What does A represent? Reactant energy What does B represent? activation energy What does E represent? product energy How would you calculate ΔH? ΔH = A – E = D D = - 890.4 kJ