ts) For a reaction, the activation energy of the forward reaction is 102 kJ and the activation energy the reverse reaction is 120 kJ. of a. What is the AH of the reaction? b. Is the reaction endothermic or exothermic? c. If a catalyst is added to the reaction, what will happen to each of the following (increase, decrease, or stay the same)? I. Activation energy of the forward reaction Activation energy of the reverse reaction ΔΗ of the reaction II. III. IV. Rate of the reaction

ts) For a reaction, the activation energy of the forward reaction is 102 kJ and the activation energy the reverse reaction is 120 kJ. of a. What is the AH of the reaction? b. Is the reaction endothermic or exothermic? c. If a catalyst is added to the reaction, what will happen to each of the following (increase, decrease, or stay the same)? I. Activation energy of the forward reaction Activation energy of the reverse reaction ΔΗ of the reaction II. III. IV. Rate of the reaction

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Q1. According to the "collision theory" model, why does the rate of a reaction increase when temperature increases? I. There are more collisions per second. II. The molecules are vibrating with a higher frequency. III. A greater proportion of the collisions between reactants have the required activation energy for the reaction to proceed a. I only b. II only c. III only d. I,II and III e. I and III only Q2. A reaction was found to be first order with a rate constant of3.4×10−4 s−1What percentage of the starting material would remain after 2 hours? a.8.65%b.96.0%c.90.3%d.4.00%e.99.9%Q3. The half-life of a rection was calculated at 300 seconds. What \% of starting material would remain after 900 seconds? a.25%
a. Will the reaction happen? Explain your answer in detail with how the bonds will form. b. Explain in detail 2 ways that the molecules can be affected to speed up the rate of the reaction. 70 kJ Reactants N Activation Energy FF 50 kJ Products FN F 10 kJ Reaction Progress E'E N 10 kJ Potential Energy [kJ]
Catalysts increase reaction rates by _____ A) increasing the activation energy. B) increasing the enthalpy of reaction. C) decreasing the enthalpy of reaction. D) providing an alternate reaction mechanism with a lower activation energy. E) changing the value of the equilibrium constant.
14. Why does the rate of the reaction decrease over time? A. Exothermic reactions lose heat which cools the reaction which decreases the reaction rate. B. As the reaction proceeds, the concentration of the products results in fewer collisions. C. As the reaction proceeds, a decrease in the concentration of reactants results in fewer successful collisions. D. Not all molecules will react and some choose to stay in their present form. E. none of the above
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If the activation energy of a reaction increases, what happens to the rate constant (k)? A.the rate constant decreases B.the rate constant stays the same C. there isn't enough information to predict what happens to the rate constant D. the rate constant increases
Page 11 ReactionThates (U State the effect of each on the rate of reaction as (1) increases, (D) decreases, or (N) no change. A. Increasing the temperature. B. Removing some of the reactants. C. Adding a catalyst! D. Placing the reaction flask in ice. E. Increasing the concentration of a reactant.
Which of the following statements is true? a. The concentration of a catalysts steadily decreases as a reaction proceeds b. A catalyst functions by selectively retarding the reverse directions c. A catalyst functions by lowering the activation energy for a reaction. d. A catalyst changes the ∆H for the reaction.
8. The rate of chemical reaction if a stress is introducede in the systemA. If the first quantity is less than the second quantityB. If the first quantity is greater than second quantityC. If the two quantities are equalD. If the two quantities cannot be compared
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Energy (kJ) Energy (kJ) Why do catalysts increase reaction rate? Catalyst Effect on Reaction Path Examples. Catalytic Convertors Reactants Products Interpret the following potential energy diagrams (reaction coordinate diagrams) Reaction 1 Reaction 2 450T B. A+B Time Reaction coordinate, A B A + B → C 1. Which reaction is endothermic? 2. What is the activation energy of Reaction 1? 3. What is the AHrxn of reaction 1? 4. What is the activation energy of reaction 2? 5. What is the AHnn of reaction 2? 6. Sketch the effect of a catalyst on both reactions 7. Does a catalyst effect the AHrn?
16. A reaction mechanism proposes three step reactions for the overall reaction and the energy diagram shows three activated states. From the proposed mechanism and energy diagram how many reaction intermediates are expected to form?A. 3 B. none C. 1 D. 2 E. 4