Chapter 11 quiz solutions

# If the concentration of a is 0023 m after 480 hours

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If the concentration of A is 0.023 M after 48.0 hours, what is the initial concentration of A? a. 0.0050 M b. 0.0s1 M q. 0.51 M ad. o.tt M \- e. 2.0 x l0' M g. Forthesecond-orderreactionbelow,theinitialconcentrationofAis 1.34 M.lf k:1.61x 10 as-I, what is the concentration of A after 18'3 minutes? 2A --+ B rate: k[A]2 a. 0.504 M b. 0.s81 M '3:.) 0.632 M d. 0.836 M e. 1.12 M 10. Which of the following factors are likely to alfeqt the rateqfuLgkur!9.adJegc-1lon? J *

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the presence of a catalyst the temperature of the reaction system the concentration ofthe reactants 1 only 2 only 3 only 1and3 1,2, and3 1 1. The effect of a catalyst on a chemical reaction is to Ld enable an a{ernatgpath for the reaction that has a lo1g 39*4igg.-bgfier' b. increase the energy ofthe products. c. increase the activation barrier for the forward reaction. d. increase the energy ofthe reactants. e. increase the frequency of collisions between reactants ar-rd products. 12. For a cerlain reaction, the activation energy is 52.1 kJ/mole. By what ratio will the rate constant change if the ternperature is decreased from 175'C to 75"C?
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