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Chapter 16 CHM 130 GCC.

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Presentation on theme: "Chapter 16 CHM 130 GCC."— Presentation transcript:

1 Chapter 16 CHM 130 GCC

2 16.1 Collision Theory Molecules must hit/collide in order to react and make products A successful collision results in reactant bonds breaking and/or product bonds forming To increase the # of successful collisions: you need more collisions. you need enough energy, Ea, activation energy. the molecules must be oriented correctly.

3 To Increase the Rate of Reaction
Increase [reactant], more reactants = more collisions Increase temperature, molecules move faster = more collisions AND more energy Add a catalyst which provides an alternate reaction pathway with lower Ea Activation Energy, Ea, is the minimum energy needed to react (turn reactants to products)

4 16.2 Energy Profiles Transition state = in between reactants and products, the reactant bonds are ½ broken and product bonds ½ formed, so this is a very high energy and unstable species, exists less than a millisecond DH = change in heat energy = product’s heat – reactant’s heat Endothermic = reactants gain or absorb heat, heat is a reactant, heat enters the rxn Reactants + Heat g Products Exothermic = reactants lose or release heat, heat is a product, heat exits the rxn Reactants g Products Heat

5 Exothermic, is DH + or -? -

6 Draw the energy profile for an endothermic reaction
Label the TS DH Reactants Products EA

7 Endothermic, is DH + or -? +

8 With Catalyst

9 Self Test Page 477 Try 1-2, 10 Answers in Appendix J

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