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chemical kinetics (practice test)
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Kinetics Practice ProblemsFor multiple-choice questions, show your work below the a-e choices for full credit AND circle your answer.
1. Calculate the average speed of reaction if at 10.0 seconds the reactant concentration is 1.25M but at 55.0
seconds the concentration is 1.02M.
a. 0.0051 M/s b. –196 M/s c. 239 M/s d. – 5.1 x 10-3 M/s e. 0.0042 M/s
2. If the rate of disappearance of H2 is 3.00 M/s, calculate the rate of NH3 appearance.
Given: N2 + 3 H2 → 2 NH3
a. 2.00 M/s b. 1.00 M/s c. 3.00 M/s d. 4.50 M/s e. 1.50 M/s
3. If a hypothetical rate law is rate = k[A]2[B]2 what is the overall reaction order? _______
4. The rate law for the following reaction is found to be rate = k[H2][I2]. H2 (g) + I2 (g) → 2 HI(g)
-3
If the rate = 4.24 x 10 M/s when [H2] = 0.150 M and [I2] = 0.250 M, calculate the rate when [H2] = 0.300
M and [I2] = 0.200 M. (Hint: first find k) Show all your work and units.
5. If the rate of a reaction increases by a factor of 9 when the concentration of a reactant is tripled, then the
reaction is _______order with respect to that reactant.
6. If 25% of a sample, which obeys first order kinetics, remains after 45 seconds, calculate the rate constant.
a. 0.031 s-1 b. – 0.031 s-1 c. – 62 s-1 d. 0.56 s-1 e. – 0.59 s-1
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