What statement about the catalyst is correct? O it increases a value of the equilibrium constant It increases the number of collisions between reacting molecules. It makes the reaction more endothermic. It provides an alternative reaction mechanism with a lower activation energy. O It shifts an equilibrium to the right

What statement about the catalyst is correct? O it increases a value of the equilibrium constant It increases the number of collisions between reacting molecules. It makes the reaction more endothermic. It provides an alternative reaction mechanism with a lower activation energy. O It shifts an equilibrium to the right

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
Collision Theory requires two factors for a chemical reaction to occur, what are those factors? * O Proper Kinetic Energy & Correct Orientation Proper Kinetic Energy & Right amount of Catalyst. Right amount of heat & Correct Orientation. Right amount of heat & High enough concentration cer C $ & 5 6 7 8 9
Match the Term with the definition 1. Equilibrium position 2. Chemical equilibrium 3. Reaction quotient 4. Law of mass action 5. Equilibrium constant C a. used to determine if a reaction has reached equilibrium b. depends on the initial concentrations of the substances in a reaction c. states that every reaction proceeds to an equilibrium state with a specific Keq d. the point at which the reaction appears to "stop" e. the ratio of product concentration to reactant concentration at equilibrium 6. For the reaction N2 (g) + O2(g) 2 NO(g) that is run at 25 °C, Kc = 1.2 × 10-30. Use this information to calculate the equilibrium co for the reaction 2 NO(g) N2 (g) + O2(g) a. 8.3 x 1029 b. 1.2 x 10-30 C. 1.7 x 1030 d. 1.1 x 10-15 e. 6.0 × 10-31 7. Write the equilibrium expression for the formation of nitrosyl bromide. a. [NO] 2 [Br]/[NOBr] 2 b. [NOBr]2/[NO] 2 c. [NOBr] 2/[NO] 2 [Br2] d. [NO] 2[Br2] / [NOBr] 2 e. [NOBr] 2/[NO]² 2NO(g) + Br2 (g) 2NOBr(g)
7. The equilibrium constant in a reversible chemical reaction at a given temperature a. depends on the initial concentration of the reactants b. depends on the concentration of one of the products at equilibrium c. does not depend on the initial concentrations d. is not a characteristic of the reaction Which of the following statements is the best explanation for the effect of increase in temperature on the rate of reaction ? a. It increases the number of particles with the necessary activation energy b. It enables the reacting particles with the necessary activation energy c. It lowers the activation energy for the reaction d. It enables the activated complex to be more easily converted to the products
Which among the following statements is/are FALSE about the collision theory? I. The rate of the reaction increases with an increasing number of effective collisions. II. The reacting species can collide in any orientation to become bonded with each other. III. Any amount of energy is required during a collision to allow formation of new bonds. Which among the following statements is/are FALSE about the collision theory? I. The rate of the reaction increases with an increasing number of effective collisions. II. The reacting species can collide in any orientation to become bonded with each other. III. Any amount of energy is required during a collision to allow formation of new bonds. All of the above I and III only I and II only II and III only
Explain an intermediate species in chemical reactions
Can a catalyst change the position of equilibrium in a reaction?
At equilibrium, the forward rate is faster than the reverse rate. True O False
A catalyst increases the activation energy required for a reaction to proceed. True False
The equilibrium constant's value is dependent on the concentration of either the reactant or product. However, the position of the equilibrium is indefinitely influenced by the concentration considering that it is predictable from the principle of Le Chatelier. OA-If the first statement is TRUE and the second statement is FALSE B - If the first statement is FALSE and the second statement is TRUE OC - If both statements are TRUE OD - If both statements are FALSE
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
when an equilibrium is disrupted (“stressed”) due to changes that a chemist imposes on the system, Le Chatelier’s Principle predicts that the equilibrium will shift in the direction that will undo as much of the change as possible. For instance, if a particular reactant compound is removed through some chemical means, then the equilibrium will shift to favor the reactants, so as to replace some of the lost compound. In this lab, you will observe the effects of stress on the tetrachlorocobaltate(II)/hexaquocobalt(II) equilibrium shown below: CoCl42-(solv) + 6 H2O(solv) Co(OH2)62+(solv) + 4 Cl-(solv) blue pink The (solv) means a solvated species. In this system, ethanol is the solvent. This means that water can not be excluded from the reaction quotient any longer, since it is now a solute in ethanol and therefore has a measurable concentration. The color of the solution provides a visual clue about the dominant cobalt species…