Which of the following statements is true about the effect of a catalyst on a chemical reaction? A: It will increase the rate of the reaction by "increasing" the activation energy barrier B: It will increase the rate of the reaction by increasing the reactant concentration C: It will increase the rate of the reaction by making the reaction more exothermic None of these A only

Which of the following statements is true about the effect of a catalyst on a chemical reaction? A: It will increase the rate of the reaction by "increasing" the activation energy barrier B: It will increase the rate of the reaction by increasing the reactant concentration C: It will increase the rate of the reaction by making the reaction more exothermic None of these A only

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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4) Which of the following statements is true of a catalyst? A) Its concentration stays constant throughout the reaction C) it provides a new pathway for the reaction B) it increases the rate of a reaction D) all of the above
why the increasing concentration of only one reactant may not affect the reaction rate?
The activation energy is the minimum amount of energy necessary for a chemical reaction to occur. O True O False
5. In 1 to 2 sentences, explain how catalysts increase the rate of reaction.
What does a catalyst do? Decrease the activation energy Catalysts are used instead of the regular reactant Decrease the energy of the reactants Produce more stable products
ii) Explain the effect of Catalyst on the rate of a chemical reaction.
In studying a reaction that goes to completion (this is not a reversible reaction) what happens to the rate with the addition of a catalyst? Will the rate increase, decrease, or stay the same?
A catalyst will... provide an alternate. pathway for a reaction that requires less activation energy be used up in the reaction provide an alternate. pathway for a reaction that requires more activation energy
Which of the following statements is the best explanation of how activation energy affects the rate of a chemical reaction? A. A high activation energy means molecules have less kinetic energy and hence rate of reaction will be slower. B. A high activation energy means molecules must have more kinetic energy to overcome it, and hence rate of reaction will be faster. C. A high activation energy means molecules have a lot of kinetic energy and hence rate of reaction will be faster. D. A high activation energy means molecules must have less kinetic energy to overcome it, and hence rate of reaction will be slower. E. A high activation energy means molecules must have more kinetic energy to overcome it, and hence rate of reaction will be slower.
Which is true about catalyzed reactions? O The net concentration of catalyst does not change O Catalysts provide an alternative pathway for the reaction to occur O Catalyst lowers the activation energy of the chemical reaction All of the choices
What can be done to lower the activation energy? Question 6 options: increasing the temperature adding more reactant molecules increasing the surface area of the particles adding a catalyst
What are three factors that affect ' rate of reactions'