I. Which of the following statements about catalysts is FALSE? A. biological catalysts are called enzymes B. catalysts do not appear in the balanced equation C. catalysts initiates a chemical reaction D. catalysts reduce the activation energy for a reaction II. Collision theory assumes that the rate of a reaction is dependent on which factor/s? A. change in energy between the products and the reactants B. change in free energy between the reactants and products. C. energy of collisions and the orientation of colliding molecules. D. energy of collisions and heat of reaction

I. Which of the following statements about catalysts is FALSE? A. biological catalysts are called enzymes B. catalysts do not appear in the balanced equation C. catalysts initiates a chemical reaction D. catalysts reduce the activation energy for a reaction II. Collision theory assumes that the rate of a reaction is dependent on which factor/s? A. change in energy between the products and the reactants B. change in free energy between the reactants and products. C. energy of collisions and the orientation of colliding molecules. D. energy of collisions and heat of 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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1. a. Explain in your own words, what is meant by the term "activation energy." b. How can the idea of activation energy be used to explain the temperature dependance of rate? c. How can activation energy be used to explain why a catalyst increases the rate of a chemical reaction
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.
10. The rate of reaction measures how fast a reactant is consumed or a product is formed. The rate is expressed as the ratio of the change in the concentration to elapsed time. A. Only the first statement is correct. B. Only the second statement is correct. C. Both statements are correct. D. Both statements are incorrect.
1. what name is given to the minimum amount of energy needed by particles for them to react when they collide? a. activation energy b. catalytic energy c. threshold energy d. starter energy 2. collision theory is based on the assumption thay for a reaction to occur, it is necessary for the reacting specie's to come together/collide with one another. Which of the following statement is NOT true about collision? a. reacting substance b. reactants must collide in the correct orientation c. reacting substances can collide in any orientation d. reacting substances must collide with enough energy to form an activated complex
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.
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Rate of chemical reactions
20. Equilibrium is the state in which a. The rate of the forward reaction is greater than the reverse reaction. b. The rate of the reverse reaction is greater than the forward reaction. c. The rate of the forward reaction and reverse reaction are equal. 21. What is a catalyst?
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
A zero extent of reaction indicates: a. reversible reaction b. no reaction c.equilibrium system d. steady-state system