CHM152GW1 Su09 crib

Chemistry (MasteringChemistry Series)

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CHM 152 Group Work 1 Summer 2009 Crib 1. What is the rate law for this reaction? H 3 BO 3 + 3 HCl J BCl 3 + 3 H 2 O ___ rate = k [H 3 BO 3 ] x [HCl] y 2. If the concentration of a reactant is doubled and the corresponding rate quadruples, what is the order with respect to that reactant? ____ 2_ 3. To graphically find the rate constant for a first order reaction you should plot __ ln A t ___ versus time. 4. What is the half-life for a first order reaction if the initial concentration of reactant is 1.25M and after 69.2 seconds the concentration has dropped to 0.955M? Ln (.955 / 1.25) = - k (69.2s) solve for k = 3.89 x 10 -3 s -1 then t 1/2 = .693 / k = 178 s 5. What percentage of a sample remains after 5 half lives? __ 3.125% ____ 6. What is the rate law for a zero order overall reaction? ____ rate = k ___ 7. If an elementary step has two reactants, what is its molecularity? ___ bimolecular ____ 8. The slow step in a mechanism is also called the __ rate determining __ step. 9.
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This document was uploaded on 09/27/2011.

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