py of reaction . When a lit match is touched to the wick of a candle, the candie begins to burn. When the match is removed, the candle continues to burn, what is the role of the match? A. behaves as a catalyst B. supplies the activation energy C. is part of the rate determining step D. lowers the activation energy barrier 5. How does a catalyst increase the rate of a reaction? A. increasing the concentration of reactant(s) B. decreasing the concentration of the reactant(s) C. increasing the activation energy of the overall reaction D. decreasing the activation energy of the overall reaction 6. Which of the following would NOT increase the rate of reaction. A. adding catalyst B. raising the temperature. C. increasing the volume of the container D. increasing the concentration of the reactants 7. Why do dust particles suspended in the air inside unheated grain elevators can sometimes react explosively? It is because the dust particles have A. high kinetic energy B. high activation energy C. catalytic effect on the reaction D. large surface area for the reaction 8. Consider the following two-step reaction mechanism:

py of reaction . When a lit match is touched to the wick of a candle, the candie begins to burn. When the match is removed, the candle continues to burn, what is the role of the match? A. behaves as a catalyst B. supplies the activation energy C. is part of the rate determining step D. lowers the activation energy barrier 5. How does a catalyst increase the rate of a reaction? A. increasing the concentration of reactant(s) B. decreasing the concentration of the reactant(s) C. increasing the activation energy of the overall reaction D. decreasing the activation energy of the overall reaction 6. Which of the following would NOT increase the rate of reaction. A. adding catalyst B. raising the temperature. C. increasing the volume of the container D. increasing the concentration of the reactants 7. Why do dust particles suspended in the air inside unheated grain elevators can sometimes react explosively? It is because the dust particles have A. high kinetic energy B. high activation energy C. catalytic effect on the reaction D. large surface area for the reaction 8. Consider the following two-step reaction mechanism:

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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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
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.
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
How does low concentration affect reaction rate? A. It decreases the amount of reactants B. It increases the frequency of particle collisions C. It highers the activation energy D. It increases the energy of particle collisions
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.
a. Define what is the reaction rate and b. Explain the importance of understanding reaction rates.
Which one of the following factors does not affect the specific rate constant of a chemical reaction? A. Arrhenius probability factor B. Amounts of reactants C. Temperature D. The presence of a catalyst E. Activation barrier
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Which of the following is directly related to reaction rate? A. Concentration B. Pressure C. Time D. Temperature
4.) Seguences of molecular steps in a chemical reaction. a. Reaction mechanism b. Activation Energy C. Rate d In ternal Energy
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 follouri
12. Three concentration-time graphs for chemical reactions are shown below: Graph 1 Graph 2 Graph 3 [X] [X] [X] Time Time Time Which of the three graphs correctly shows a reaction in which the concentration of the reactant X would affect the rate of the reaction? a. Graph 1 only b. Graph 2 only c. Graphs 1 and 3 d. Graphs 1 and 2