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Exothermic vs. Endothermic. Decomposition of Nitrogen Triiodide.

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Presentation on theme: "Exothermic vs. Endothermic. Decomposition of Nitrogen Triiodide."— Presentation transcript:

1 Exothermic vs. Endothermic

2

3 Decomposition of Nitrogen Triiodide

4 2 NI 3 (s) N 2 (g) + 3 I 2 (g) NI 3 I2I2 N2N2

5 Exothermic Reaction Reactants  Products + Energy 10 energy = 8 energy + 2 energy Reactants Products -H-H Energy Energy of reactants Energy of products Reaction Progress

6 Endothermic Reaction Energy + Reactants  Products +  H Endothermic Reaction progress Energy Reactants Products Activation Energy

7 Effect of Catalyst on Reaction Rate reactants products Energy activation energy for catalyzed reaction Reaction Progress No catalyst Catalyst lowers the activation energy for the reaction. What is a catalyst? What does it do during a chemical reaction?

8 An Energy Diagram activated complex activation energy EaEa reactants products course of reaction energy Animation by Raymond Chang All rights reserved

9 Energy Sources in the United States Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 307 WoodCoalPetroleum / natural gasHydro and nuclear Percent

10 Energy Sources in the United States Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 307 WoodCoalPetroleum / natural gasHydro and nuclear Percent

11 Energy Sources in the United States Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 307 WoodCoalPetroleum / natural gasHydro and nuclear Percent

12 Energy Conversion Timberlake, Chemistry 7 th Edition, page 202 fan electrical energy to mechanical energy light bulb electrical energy to light energy to thermal and radiant energy coffee maker electrical energy to thermal energy pencil sharpener electrical energy to mechanical energy


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