Ch_13_IV_Catalysis - 2H2(g) + O2(g).2H2O(g)&...

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Sheet1 Page 1 A catalyst is a substance that increases the reaction rate, but is not consumed in the reaction. A catalyst provides a new and easier pathway for the reaction. Note, both the rate of the forward and reverse No change in amount of final product. f Example of Homogeneous Catalyst (same phase) Plausible mechanism Called? C 2Ce4+(aq) +Tl+(aq). 2Ce3+(aq) +Tl Tl+(aq) +Mn4+(aq).Tl3+(aq) +Mn2+(aq) (very slow) + (3-body encounter) Manganese ion: Mn2+(aq) (most stable) Mn3+(aq) Mn4+(aq) (slow) Ce4+(aq) +Mn3+(aq).Ce3+(aq) +Mn4+(aq) (fast) (fast) Allows 2-body EncountersCe4+(aq) +Mn2+(aq).Ce3+(aq) +Mn3+(aq) E Heterogeneous Catalyst (different phases)
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Unformatted text preview: 2H2(g) + O2(g).2H2O(g)& Large Ea& Spark& FlameH2 gasPt gauzeCommon metallic catalyst: Pt, Pd, and Ni 2 Second Example Heterogeneous Catalyst S Simplification of the catalysis of the reaction CO (g) and O2(g) to make CO S Text Box: Simplified Lock-and-key Mechanism for Enzyme Reaction Third Example Heterogeneous Catalyst Sheet1 Page 2 The cigarette ash contains trace amounts of metal compounds that catalyze the combustion of sugar. A sugar cube rubbed in cigarette ashA sugar cubeBurnsMelts at 185CFourth Example Heterogeneous Catalyst i Simplified Lock-and-key Mechanism for Enzyme Reaction S...
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This note was uploaded on 11/09/2010 for the course CHEM Chem taught by Professor Petrova during the Spring '09 term at NJIT.

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Ch_13_IV_Catalysis - 2H2(g) + O2(g).2H2O(g)&...

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