1. Consider the reaction X + Y ==> Z. Which rate law corresponds to a zero order reaction?

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Christine Booth
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1 AP Chemistry Kinetics Review Sheet (CQ) 1. Consider the reaction X + Y ==> Z. Which rate law corresponds to a zero order reaction? 2. Consider the reaction X + Y ==> Z. Which rate law corresponds to a reaction that is second order with respect to [Y]? 3. Consider the reaction X + Y ==> Z. Which rate law corresponds to a reaction where tripling the concentration of X would lead to a tripling of the reaction rate? 4. Consider the reaction X + Y ==> Z. Which rate law corresponds to reaction where halving the concentration of Y would lead to no change in the rate of the reaction? [Y] [X] 5. Consider the reaction X + Y ==> Z. Which rate law corresponds to a reaction where doubling both the concentration of X and Y would lead to the rate increasing by a factor of 16? 2 Consider the following proposed mechanism for a reaction. 6. Which of the following shows the overall reaction? (A) X + Y ==> A + D (B) 2X + Y ==> A + D (C) 2X + Y + Z ==> A + D (D) 2X + Y + Z ==> Z + A

2 Consider the following proposed mechanism for a reaction. 7. Which species is an intermediate? (A) X (B) Y (C) Z (D) A (E) D Consider the following proposed mechanism for a reaction. 8. Given that the rate law for the reaction is found to be Rate = k [X][Y], which step in the mechanism is the slowest? (A) Step I (B) Step II (C) Not enough data to tell (D) A combination of Step I and Step II 9. All of the following statements are true of a possible mechanism for a reaction except one. Which one is NOT true? (A) A multi-step mechanism will have one step that is rate determining (B) The mechanism will have steps that sum together to equal the overall reaction (C) The reaction will have a rate equation that includes only the reactants that appear in the slow step of the mechanism (D) If intermediates are present in the mechanism they will cancel out when considering the overall equation for the reaction (E) The reaction will have a rate equation that includes all the reactants that appear in all the steps of the mechanism 10. A possible mechanism for any given chemical reaction; (A) Can only be determined experimentally (B) Can be derived from the balanced chemical equation for the reaction (C) Always has the slowest step first (D) Must always have at least four steps (E) May have steps that do not sum to give the overall balanced equation 11. For the chemical reaction H 2 + Cl 2 ==> 2HCl, what can be said of the relative rates of consumption of the reactants when compared to the formation of products? (A) HCl will be produced at the same rate that chlorine is consumed (B) HCl will be produced at half the rate that chlorine is consumed (C) HCl will be produced at twice the rate that chlorine is consumed (D) It is not possible to tell anything about relative rates of consumption and formation from the chemical equation 12. All the following statements about catalysts are true, EXCEPT; (A) They provide a reaction pathway of lower activation energy (B) They are the same at the end of a reaction as they are at the start of a reaction (C) They change the value of Delta H for a reaction (D) They increase the rate of both the forward and the backward reaction in an equilibrium reaction

3 (E) They have no effect on the amount of products formed 13. A first order reaction has a half-life of days. What fraction of the reactant has been used up after days (A) 25.00% (B) 75.00% (C) 40.00% (D) 6.250% (E) 93.75% 14. In a reaction that is first order with respect to X and first order with respect to Y, which of the following changes will have NO effect overall on the rate? (A) Doubling [X] and doubling [Y] (B) Doubling [X] (C) Quadrupling [Y] (D) Halving [X] and doubling [Y] (E) Halving [X] and halving [Y] 16. If the concentration of a reactant is tripled and the rate increases by a factor of nine, what is the order with respect to that reactant? (A) 0 (B) 1 (C) 2 (D) 3 (E) Consider the data below, for the reaction A + B ==> X. What is the order with respect to [A]? (A) 1 (B) 2 (C) 3 (D) Cannot tell from the data given 18. Consider the data below, for the reaction A + B ==> X. What is the rate law?

4 (A) Rate = [B] 2 (B) Rate = k [A][B] (C) Rate = k [A] 2 (D) Rate = k [B] Consider the data below, for the reaction A + B ==> X. All of the following will increase the rate of reaction, EXCEPT; (A) Increasing the concentration of B (B) Increasing the temperature (C) Adding a catalyst (D) Increasing the concentration of A (E) ALL of the above 20. Consider the data below, for the reaction A + B ==> X. In experiment 3, what would be the rate of change of concentration of B measured in M sec -1? (A) Decrease at 8 x 10-3 (B) Increase at 8 x 10-3 (C) Decrease at 2 x 10-3 (D) Increase at 2 x 10-3 (E) Decrease at 4 x Consider the data below, for the reaction A + B ==> X. Calculate a value for the rate constant, k.

5 (A) 8 x 10-3 M -1 sec -1 (B) 2 x 10-3 M -2 sec -1 (C) 2 x 10-3 M -1 sec -1 (D) 1 x 10-3 M -2 sec -1 (E) 8 x 10-3 M -2 sec A reaction that is considered to be fast is likely to have which of the following characteristics? (A) A negative Delta H (B) A positive Delta H (C) A low activation energy (D) A high activation energy (E) A large equlibrium constant 23. Which of the following reactions can have a rate and a rate constant (k) with the same units? (A) A zero order reaction (B) A first order reaction (C) A second order reaction (D) No reaction can have this 24. In an equilbrium reaction that has been catalyzed, all of the following statements are true, EXCEPT; (A) In the catalyzed reaction the rate of both the forward AND backward reactions are increased (B) In the catalyzed reaction equilibrium will be achieved more quickly (C) The catalyst will be unchanged at the end of the reaction (D) In the catalyzed reaction K for the forward reaction will be larger (E) The catalyst will have the effect of providing a reaction pathway with a lower activation energy QUESTION 4. Plotting a graph of ln [reactant] versus time will give a straight line if the reaction is what, with respect to [reactant]? (A) Zero Order (B) First Order (C) Second Order (D) Third order 25. In the Maxwell-Boltzman distribution plot for a given reaction at two different temperatures, what can be said about the total area underneath the curve for the relatively hot temperature compared to the curve for the relatively low temperature? (A) The area under the hot curve is greater since more particles possess the minimum activation energy required (B) The area under the cold curve is greater since more particles possess the minimum activation energy required (C) The areas are the same since the number of moles of gas do not change as a result of heating or cooling (D) The areas are the same since the reaction has a fixed activation energy (E) The areas are the same since gases occupy the same space regardless of the temperature

It must be determined from experimental data, which is presented in table form.

It must be determined from experimental data, which is presented in table form. Unit 10 Kinetics The rate law for a reaction describes the dependence of the initial rate of a reaction on the concentrations of its reactants. It includes the Arrhenius constant, k, which takes into account