10 - Chemistry 4/10 Exothermic-heat released...

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Chemistry 4/10 Exothermic—heat released Endothermic—heat absorbed Ice creation is endothermic liquid water creation is exothermic Activation energy (E a )—the energy required to initiate the reaction (non- spontaneous) the molecules must possess enough energy so that their collisions will be productive- leading to products Endothermic—reactions will have products higher in energy than the reactants; there will still be a required activation energy.
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Endothermic Rxn (Energy Products > Energy Reactants) Exothermic Rxn (Energy Products < Energy Reactants Endothermic Rxn is breaking bonds Exothermic Rxn is the formation of bonds Because you can get more energy from the combustion of H2 We know this because we can calculate the energy released (heat of the combustion or energy change) for H2 and gasoline and then compare which one releases more energy
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Balanced Equation 2H2 + O2 -->2H20 + energy Reading the chemical reaction in terms of moles 2 mol H2 + 1 mol O2 produces 2 mol H2O +energy
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This note was uploaded on 05/05/2008 for the course CHEM 104 taught by Professor Splawn during the Spring '08 term at Wofford.

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10 - Chemistry 4/10 Exothermic-heat released...

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