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Published byLee Hines Modified over 8 years ago
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What did the bartender say when oxygen hydrogen sulfur sodium and phosphorous walked into his bar? OH SNaP!
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Potential Energy Diagrams
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Types of Energy Kinetic the energy of motion Potential stored energy The total amount of energy in a system is conserved (no Energy lost) but it is converted (changed) into different forms
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The energy of any object is the sum of its kinetic and potential energies At collision point, the energy in the system is 100% potential energy due to repulsion of valence electrons
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Enthalpy ∆H Reactions give off heat energy ∆H = H products -H reactants H products > H reactants endothermic (gets colder) H products < H reactants exothermic (gets hotter)
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PE diagram (exothermic) Insert from notes
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Exothermic Examples – Burning – Heat packs
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PE diagram (endothermic)
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Endothermic Examples – Colp packs – Photosynthesis – Electrolysis of water
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PE diagram (catalyst) +ve catalyzed reaction with have an increased reaction rate because the reactants can achieve a lower E A.
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N2(g) + 2O2(g) 2NO 2(g) When ∆H = +10kcal and E A(f) = 65 kcal; include position of activated complex, a value for E A(f) and show the effect of a positive catalyst
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