24. A pressure cooker reduces cooking time because a. The heat is more evenly distributed. b. The higher pressure tenderizes the food. c. The boiling point is elevated. d. A large flame must be used. 25. A catalyst can a. shift the equilibrium of reaction b. diminish the activation energy c. increase the rate constant of forward reaction d. decrease the pressure 26. It states that the rate of a chemical reaction is proportional to the activity of the reactants. a. Law of Mass Action b. Hess' Law c. Le Chatelier's Principle d. Second Law of Thermodynamics

24. A pressure cooker reduces cooking time because a. The heat is more evenly distributed. b. The higher pressure tenderizes the food. c. The boiling point is elevated. d. A large flame must be used. 25. A catalyst can a. shift the equilibrium of reaction b. diminish the activation energy c. increase the rate constant of forward reaction d. decrease the pressure 26. It states that the rate of a chemical reaction is proportional to the activity of the reactants. a. Law of Mass Action b. Hess' Law c. Le Chatelier's Principle d. Second Law of Thermodynamics

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

Chapter12: Chemical Kinetics

Section: Chapter Questions

Problem 80E: One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where...

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Similar questions

use the kineticmolecular theory to explain why an increase in temperature increases reaction rate.
For the gas-phase reaction 2H2+O22H2O rxnG is 457.18kJ. What does a graph of G versus lnQ lnQ varying from 50 to +50 look like at 25C? Change the temperature and find out if the graph looks substantially different at different temperatures.
a What happens to a reaction rate as temperature drops? Give two explanations for the change. State which one is more important and explain why. b How does a catalyst affect reaction rates? c Compare reaction rates when a given reactant concentration is high with the rate when the concentration is low. Explain the difference.
What is the role of the activated complex in a chemical reaction?
Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?
Consider the following hypothetical reaction: A+BC Calculate the average rate of the reaction on the basis of the following information: a. Pure A,B, and C are mixed together at concentrations of A+B=0.400M, C=0.150M. After 6.00minutes, the concentration of C is 0.418M. b. Pure A, and B are mixed together at same concentrations of 0.361M. After 7.00minutes, the concentration of A is found to be 0.048M.
Consider the following activation energy diagram. Which of the following statements about the diagram are true? (a) E a(forward)E a(reverse)(b) B represents the activation energy of the forward reaction. (c) Energy (H)for the reaction is AC. (d) E a(forward)=BA(e) E a(forward)=E a(reverse)C
How does an increase in temperature affect rate of reaction? Explain this effect in terms of the collision theory of the reaction rate.
Why are there no changes specified for Ni in Exercise 13.61, part (f)? What property of Ni does change?
Based on the diagram in Exercise 12.83, which of the reactions has the fastest rate? Which has the slowest rate?
A reaction is started by mixing reactants. As time passes, the rate decreases. Explain this behavior that is characteristic of most reactions.
One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the following reaction: CCl2F2(g)Freon-12hvCF2Cl(g)+Cl(g) Chlorine atoms can act as a catalyst for the destruction of ozone. The activation energy for the reaction Cl(g) + O3(g) ClO(g) + O2(g) Is 2.1 kJ/mol. Which is the more effective catalyst for the destruction of ozone, Cl or NO? (See Exercise 75.)