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Topic: Potential Energy Curve Do Now : p.26

Topic: Potential Energy Curve Do Now : p.26. Spontaneous Processes. =physical or chemical change that occurs with no outside intervention However, some energy may be supplied to get process started = activation energy. Iron rusting 4Fe(s) + 3O 2 (g)  2Fe 2 O 3 (s)  H = -1625 kJ.

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Topic: Potential Energy Curve Do Now : p.26

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  1. Topic: Potential Energy CurveDo Now: p.26

  2. Spontaneous Processes =physical or chemical change that occurs with no outside intervention • However, some energy may be supplied to get process started = activation energy Iron rusting 4Fe(s) + 3O2(g)  2Fe2O3(s) H = -1625 kJ CombustionCH4(g) + 2O2(g)  CO2(g)+ 2H2O(l) H = -891kJ

  3. Can you think of others?

  4. VIDEO

  5. Activation Energy & Reaction

  6. Activation Energy • = Energy needed to initiate reaction • Energy needed to overcome reaction barrier • difference between where reactants start & top of hill • Difference between reactants & activated complex

  7. Activated Complex = intermediate formed during conversion from reactants to products Reactants combine to form an unstable complex Energy Diagram of a Reaction

  8. Potential Energy Curve: Endothermic Products have more P.E. than reactants Start low, end high

  9. Potential Energy Curve: Exothermic Products have less P.E. than reactants Start high, end low

  10. Have to label 6 energies on curve: reactants & products • PE reactants • PE products • PE activated complex • Ea forward reaction • Ea reverse reaction • H

  11. PE reactants Time What kind of reaction is represented? 40 Ea reverse rxn Ea forward rxn 30 Enthalpy  20 PE activated complex PE products 10

  12. 40 30 Enthalpy  H of reaction 20 10

  13. Ea forward rxn Ea reverse rxn 40 30 Enthalpy  PE of activated complex 20 PE of reactants 10 P.E. of products Time What kind of reaction is represented?

  14. 40 30 Enthalpy  20 H of reaction 10

  15. Catalyst (in the body = enzyme) • Substance that increases rate of reaction without itself being consumed • does not participate in reaction • Lowers the activation energy for the reaction

  16. DOES IT AFFECT ΔH? Catalysts do not affect ΔH

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