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Ch12a - Kinetics 1 1 Reaction Rates 2 Rate Laws 3 Order of...

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Kinetics 1 1) Reaction Rates 2) Rate Laws 3) Order of Reaction
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Kinetics Reactants → Products How transformation is achieved *rate at which reaction occurs *factors that affect the rate *reaction pathway *factors that affect the pathway
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Rates Change in amount / Change in time (e.g. Miles / Hour) For Chemical Reactions ∆ moles / ∆ time ∆ concentration / ∆ time ∆ pressure / ∆ time
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Relative Rates A → 2 B Start with all A and no B How will rate of A’s disappearance compare to B’s appearance?
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N 2 (g) + 3 H 2 (g) → 2 NH 3 (g) NH 3 (g) made at 0.10 mol / L s. * Rate of H 2 disappearance? * Rate of N 2 disappearance? * Conc. vs. time graph?
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Rate Laws Reaction: A → B Rate Law: Rate = k [A] n k = rate constant, n = order of reaction Reaction: A + B → C Rate Law: Rate = k [A] n [B] m n = order with respect to A m = order with respect to B n + m = overall order of reaction *k, n, m must be determined by experiment
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Typical Orders Rate = k [A] n n = 0, zero order *Rate = k [A] 0 or Rate = k *[A] has no effect on rate
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