122ch14b

# 122ch14b - 13 General examples and statements about Initial...

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13 General examples and statements about Initial Rate problems (next 3 pages).

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14 General examples and statements about Initial Rate problems (cont.)
15 General examples and statements about Initial Rate problems (cont.)

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16 14.24) Reaction between A, B and C is first order in A, zero order in B and 2 nd order in C. a) Rate Law: r = [A] 1 [B] 0 [C] 2 = [A] [C] 2 Since the reaction is zero order in B it doesn’t depend on B so we leave it out of the rate law. Also, we don’t show exponents of 1. The overall order is 3 rd order (1 + 2, add up the orders of each substance). b) What happens to the rate if [A] is doubled ? Since rate and A are directly proportional (because the exponent of A is 1) whatever changes occur in A the same changes occur in the rate. When [A] doubles the rate inc. by a factor of 2. The rate is proportional to [A] so when [A] doubles, rate doubles, 2 1 = 2. r 1 = k[A] 1 [C] 2 r 2 = k[A] 2 [C] 2 [A] 2 = 2[A] 1 r 2 = k {2[A] 1 }[C] 2 = 2 k [A] 1 [C] 2 = 2 r 1 The rate law is a general algebraic expression for the rate of rxn (dependent variable) at any reactant conc. (independent variable); there are an infinite number of combinations of [A] and rate. The rate constant, k , is a
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122ch14b - 13 General examples and statements about Initial...

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