1. The progress of a reaction from reactants to products is shown in the following diagram: تمر Energy, kJ 100 50 0 -50 Curve A - - Curve B Progress of reaction (a) Which curve (A or B) represents the catalyzed reaction? (b) How many elementary steps are in the catalyzed reaction? (c) How many elementary steps are in the uncatalyzed reaction? (d) What is the activation energy Ea of the uncatalyzed reaction? (to the nearest kJ) (e) What is the activation energy of the catalyzed reaction? (to the nearest kJ) (f) What is A H for the reaction? (to the nearest kJ) (g) What is the activation energy of the reverse uncatalyzed reaction? (to the nearest kJ)

Where a gets converted to products, what happens in these circumstances?

MISSED THIS? Read Section 15.5 (Pages 650 - 656) 15.7 (Pages 661-666) Suppose that a catalyst lowers the activation barrier of a reaction from 121 kJ/mol to 57 kJ/mol By what factor would you expect the reaction rate to increase at 25.00 °C? (Assume that the frequency factors for the catalyzed and uncatalyzed reactions are identical.) k₂ k₁

Which of the following statements is correct about the rate constant for the following reaction: 2 H20 (g) = 2 H2 (g) + 02 (g)? a) The rate constant increases by increasing the pressure of reactants alone. b) The rate constant increases by increasing the temperature of the reaction alone. a) only b) only Both a) and b) are correct Neither a) nor b) is correct.

The rate constant for a particular reaction is 1.30 × 10−4 M−1s−1 at 100°C, and 1.6 × 10−3 M−1s−1 at 150°C. What is the activation energy (in kJ/mol) for this reaction? 4 sig figs if possible please

For the reaction A + B ---> C, the rate constant at 215 oC is 5.0 x 10-3 and the rate constant at 452oC is 1.2 x 10-1.a) What is the activation energy in kJ/mol?b) What is the rate constant at 100o C?

22.) A certain reaction has the rate law rate = k[A] where k = 0.539 min-1. How many minutes will it take for the [A] to decrease from 0.802 M to 0.299 M?   Your Answer:

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The following mechanism has been proposed for the gas- phase reaction of chloroform (CHCI,) and chlorine: Step 1: Cl2(8) 2 CI(g) (fast) Step 2: CI(g) + CHCI3(g) , HCI(8) + CC13(8) (slow) Step 3: CI(g) + CCl;(g) , CC4 (fast) (a) What is the overall reaction? (b) What are the intermedi- ates in the mechanism? (c) What is the molecularity of each of the elementary reactions? (d) What is the rate-determining step? (e) What is the rate law predicted by this mechanism? (Hint: The overall reaction order is not an integer.)

3. Which of the following is NOT TRUE about a catalyst? A) It lowers the activation energy of the reaction. B) It decreases AH for the reaction. C) It changes the mechanism. D) It increases the number of effective collisions. E) It is not consumed in the reaction.