Which of the following correctly describes intermediates and/or transition states? Select one: a. Transition states have partially formed bonds whereas intermediates have fully formed bonds. b. Transition states occur at minima on reaction coordinate diagrams. c. Both transition states and intermediates occur at maxima on reaction coordinate diagrams. d. none of the above e. An intermediate is always produced after the rate-determining

Which of the following correctly describes intermediates and/or transition states? Select one: a. Transition states have partially formed bonds whereas intermediates have fully formed bonds. b. Transition states occur at minima on reaction coordinate diagrams. c. Both transition states and intermediates occur at maxima on reaction coordinate diagrams. d. none of the above e. An intermediate is always produced after the rate-determining

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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In general as a reaction proceeds, what happens to the rate of the reaction? Select one: a. Generally as a reaction proceeds the reaction rate will increase with time. b. Generally as a reaction proceeds the reaction rate will remain constant with time. c. Generally as a reaction proceeds the reaction rate will decrease with time.
Which of the following changes would most likely increase the rate of a reaction? a. increasing the size of the reactant particles b. decreasing the reaction temperature c. decreasing the concentration of a reactant d. decreasing the activation energy for the reaction
A Moving to another question will save this response. Question 5 As the temperature of a reaction is increased, the rate of the reaction increases because the...? OA product molecules collide more frequently and with greater energy per collision. OB. reactant molecules collide more frequently and with greater energy per collision. Oc activation energy is lowered. OD. reactant molecules collide less frequently with lower energy per collision. OE reactant molecules collide less frequently. OF the rate of reaction is inversely proportional to the number of effective collisions per second. A Moving to another question will save this response. MacBook Air SO esc %23 %24 & 2 3 4 5 6. 8. T Y G H K V B comman
Catalysts play an important role in many reactions. Check all of the true statements. A. Any catalyst will speed up any reaction. B. Catalysts can be in the same phase or a different phase as the reactants. C. A catalyst can change the mechanism of a reaction. D. A catalyst is consumed in a chemical reaction.
Which statement is INCORRECT with regard to kinetics? A. Each 10o C rise in temperature approximately doubles the rate of a reaction. B. The rate is expressed as the change in concentration per the change in time. C. The rate of reaction is always expressed as a positive value. D. The presence of a catalyst decreases the rate of reaction by lowering the Ea of the reaction. E. The effect that changing the concentration of a reactent has on the rate of a reaction must be determined experimentally.
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
As the temperature of a reaction is increased, the rate of the reaction increases because the: a) reactant molecules collide less frequently. b) reactant molecules collide with greater energy. c) reactant molecules collide less frequently and with greater energy. d) activation energy is lowered. e) activation energy is increased because of more collisions.
Why does the rate of most reactions decrease over time? A. A decrease in reactant concentration reduces the frequency of successful collisions. B. A decrease in temperature reduces the average kinetic energy of the particles. C. An increase in product concentration interferes with the effectiveness of the catalyst. D. An increase in pressure of the system reduces the movement and energy of particles.
Consider the following mechanism: NO → N + O O + O3 → 2 O2 O2 + N → NO2 What is the role of O2? A. product only B. intermediate only C. Both intermediate and product D. reactant E. catalyst
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