7. Consider the following equilibrium: H 2 O (g) + CO (g) H 2(g) + CO 2(g) At hi

Question

7.         Consider the following equilibrium: H2O(g)  +  CO(g)   H2(g)  +  CO2(g)

At high temperature, H2O and CO are placed in a closed container. As the system approaches equilibrium, the

            A.        Rate of the forward and reverse reaction both increase

            B.         Rate of the forward and reverse reaction both decrease

C.        Rate of the forward reaction decreases and the rate of the reverse reaction increases

D.        Rate of the  forward reaction increases and the rate of the reverse reaction decreases

8.         Which of the following statements are true for all equilibrium systems?

                        I.          Macroscopic Properties are constant

                        II.         Mass of the reactants equals mass of the products

                        III        Equilibrium can be achieved from either products or reactants

            A.        I and II only

            B.         I and III only

            C.        II and III only

            D.        I, II, and III

9.         Consider the following equilibrium:  N2O4(g)  +  heat               2NO2(g)

Initially, a 1.0 L container is filled with 2.0 mol of NO2. As the system approaches equilibrium, the rate of reaction of NO2

            A.        Increases and [ N2O4 ] increases

            B.         Increases and [ N2O4 ] decreases   

            C.        Decreases and [ N2O4 ] increases

            D.        Decreases and [ N2O4 ] decreases

Explanation / Answer

7) C.        Rate of the forward reaction decreases and the rate of the reverse reaction increases

initially more reactants are present so high reaction rate as reaction progress concentration of reactants decreases and products increases. so rate of forward reaction decreases and rate of backward reaction increases.

8)  B.         I and III only

9)  C.        Decreases and [ N2O4 ] increases

9)

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