I. Choose the letter of the best answer and write your answer on the space provided before the number. 1. Why does the rate of the reaction increase when the temperature of a reaction increase? A. activation energy is lowered B. reactant molecules collide less frequently C. reactant molecules collide more frequently and with greater energy per collision D. reactant molecules collide less frequently and with greater energy per collision 2. Which of the following lowers the activation energy for a reaction? A. adding a catalyst for the reaction B. increasing the concentrations of reactants C. raising the temperature of the reaction D. removing products the reaction as proceed

I. Choose the letter of the best answer and write your answer on the space provided before the number. 1. Why does the rate of the reaction increase when the temperature of a reaction increase? A. activation energy is lowered B. reactant molecules collide less frequently C. reactant molecules collide more frequently and with greater energy per collision D. reactant molecules collide less frequently and with greater energy per collision 2. Which of the following lowers the activation energy for a reaction? A. adding a catalyst for the reaction B. increasing the concentrations of reactants C. raising the temperature of the reaction D. removing products the reaction as proceed

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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7. Reactions A and B were studied and found to produce the given energy diagrams. 150 150 Energy 100 (kJ/mol) 100 Energy (kJ/mol) 50 50 Reaction progress Reaction progress Reaction A Reaction B A third reaction, C was studied with a measured activation energy of 55 KJ/mol. Assume all reactions take place at the same temperature. Reaction A is slowest a. b. Reaction B is slowest c. Reaction C is slowest d. All reactions happen at the same rate.
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Which of the following will decrease the activation energy, Ea, of a reaction? O Increasing the reactant concentrations Removing the products as they form O Increasing the temperature O Adding a catalyst O Decreasing the pressure A Moving to another question will save this response. M esc 20 F3 F1 F2 F4 F5 @ #3 24 4 Q W R. A
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
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.
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
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.
Consider the following mechanism: Cl2 → Cl+ + Cl- Cl- + H2S → HCl + HS- Cl+ + HS- → HCl + S What is the role of Cl+? A. product B. intermediate C. catalyst D. reactant
Which statement is NOT correct? A. Activation energy is the same in the forward and reverse direction. B. The activated complex will be the highest on the reaction energy diagram. C. If the forward reaction is endothermic, the reverse reaction will be exothermic. D. In an endothermic reaction, the activation energy is usually greater than the change in enthalpy. E. An activated complex has higher energy than any molecule contributing to it.