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Understanding Potential Energy Diagrams in Exothermic and Endothermic Reactions

Explore the changes in potential energy diagrams for burning magnesium, comparing exothermic and endothermic reactions with and without a catalyst. Dive into activation energy and heat transfer, supported by evidence and reasoning.

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Understanding Potential Energy Diagrams in Exothermic and Endothermic Reactions

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  1. Potential Energy Diagrams

  2. Burning Magnesium

  3. Exothermic Reaction___________________________

  4. Key • Potential energy of the reactants _________________________________ • Potential energy of the activated complex__________________________ • Potential energy of the products _________________________________ • Activation energy for the forward reaction__________________________ • Activation energy for the reverse reaction__________________________ •  H (Exothermic__________________; Endothermic______________) • Potential energy of the activated complex with catalyst _______________ • Activation energy of the forward reaction with catalyst________________ • Activation energy of the reverse reaction with catalyst_________________

  5. Endothermic Reaction • QUESTION: How would the potential energy diagram change for an endothermic reaction with and without a catalyst? • CLAIM: With your lab partner draw and label a potential energy diagram for the decomposition of magnesium oxide. Include your labeled diagram on the next slide.

  6. Endothermic Reaction_____________________

  7. EVIDENCE (fill in the following information from your graphs) Exothermic Endothermic a. In an endothermic reaction the heat of the reactants is _______ than the heat of the products. b. A catalyst ______ the activation energy. • a. In an exothermic reaction the heat of the reactants is ______ than the heat of the products. • b. A catalyst _______ the activation energy.

  8. REASONING: (Explain your evidence) Exothermic Endothermic An endothermic reaction _______ heat because the heat of the reactants is _______ than the heat of the products. A catalyst ______ the rate of the a reaction by _____________ but the heat of the reaction _________. • An exothermic reaction _______ heat because the heat of the reactants is _____ than the heat of the products. • A catalyst ______ the rate of a reaction by________________ but the heat of reaction ________.

  9. SUMMARY

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