9. What effect does a catalyst have on a reaction? A. It changes the AH of a reaction. B. It increases the kinetic energy of the reactants. C. It decreases the potential energy of the products. D. It provides a reaction mechanism with a lower activation energy. 10. What does an additional catalyst to a reaction provide? A. lower activation energy and lower reaction rate. B. lower activation energy and higher reaction rate. C. higher activation energy and lower reaction rate. D. higher activation energy and higher reaction rate. 11 Which of the follouin

9. What effect does a catalyst have on a reaction? A. It changes the AH of a reaction. B. It increases the kinetic energy of the reactants. C. It decreases the potential energy of the products. D. It provides a reaction mechanism with a lower activation energy. 10. What does an additional catalyst to a reaction provide? A. lower activation energy and lower reaction rate. B. lower activation energy and higher reaction rate. C. higher activation energy and lower reaction rate. D. higher activation energy and higher reaction rate. 11 Which of the follouin

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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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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Iron fillings (very small pieces of iron) rust faster than iron nails. This demonstrates that the rate of reaction depends on the a. temperature of the reactants b. chemical nature of the reacting substances c. state of subdivision of the reactants d. concentrations of the reactants e. presence of a catalyst
Consider the following energy diagram. a.How many steps are involved in this reaction? b. Label ΔHo and Ea for each step, and label ΔHooverall. c.Label each transition state. d.Which point on the graph corresponds to a reactive intermediate? e.Which step is rate-determining? f. Is the overall reaction endothermic or exothermic?
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