1) Consider the following reversible system: Energy + NO (g) + Cl2 (g) = NOCl2.

Question

1) Consider the following reversible system: Energy + NO (g) + Cl2 (g) = NOCl2. Suppose that the system is at equilibrium and then the temperature of the system is decreased. Which of the following changes will be observed? Select all that apply: a) The concentration of NO will decrease b) The concentration of Cl2 will increase, c) the concentration of NOCl2 will increase d) The concentration of NOCl2 will decrease e) the concentration of Cl2 will be unchanged. f) the concentration of NOCl2 will be unchanged g) the concentration of NO will be unchanged. 2) Consider the following reversible system. The system has established an equilibrium position. Then the volume of the reaction container is increased. In which direction would the system shift in order to establish a new equilibrium? a) NH4Cl(s) = NH3 + HCl (g) ?shift to the right ? shift to the left ? no shift b) N2(g) + O2 (g) = 2NO (g) ?shift to the right ?shift to the left ?no shift 3) Equilibrium systems often shift in response to temperature changes. What shift would be obsesrved of the following two systems by an increase in temperature? What change in the Kq value explains such a shift? a) 4 NH3(g) + 5O2(g) = 4 NO (g) + 6 H20 (g) + heat ? shifts to the right since Keq increases, ? shifts to the left since Keq increases, ?shifts to the left since Keq decreases, ? shifts to the right since Keq decreases. b) heat + NaCl (s)= Na+ (aq) + Cl- (aq)... ?shifts to the right since Keq decreases, ?shifts to the right since Keq increases, ?shifts to the left since Keq decreases, ?shifts to the left since Keq increases 4) Decreasing the overall volume of a container will cause the equilibrium to shift in the direction that ( decreases or increases) the total number of gas particles?

Explanation / Answer

1) answer : b) The concentration of Cl2 will increase

                   d) The concentration of NOCl2 will decrease

explanation : forward reaction is endothermic reaction on decrease in temperature the reaction shifts to backward direction

2)

a)

answer : (g) shift to the right

b) no shift

3) a ) shifts to the left since Keq decreases

b) shifts to the right since Keq increases,

4) increases

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