Question :
21) For the reaction of carbon with carbon dioxide to : 1324874
21) For the reaction of carbon with carbon dioxide to make carbon monoxide, one set of conditions produced a Kc = 1.2 × 10-1. At equilibrium at a certain temperature, the concentration of product was 0.60 M. What was the concentration of carbon dioxide at that temperature?
C(s) + CO2(g) ? 2CO(g)
A) 3.0 M
B) 0.60 M
C) 0.36 M
D) 3.33 M
E) 5.0 M
22) In the following gas phase reaction, Kc is much less than 1. At equilibrium, which of the following statements is true?
COCl2(g) ? CO(g) + Cl2(g)
A) The concentration of reactant is much greater than the concentration of products.
B) The concentration of products is much greater than the concentration of reactants.
C) The concentrations of products and reactants are approximately equal.
D) A catalyst will increase the concentration of products formed.
E) At equilibrium, the concentrations of reactants and products are equal.
23) The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is Kc = 2 × 1011. This means that the reaction mixture at equilibrium is likely to consist of
A) mostly starting materials.
B) an equal mixture of products and reactants.
C) twice as much starting material as product.
D) twice as much product as starting material.
E) mostly products.
24) Which of the following equilibrium constants indicates the reaction that gives the smallest amount of product?
A) Kc = 5 × 10-10
B) Kc = 5 × 10-1
C) Kc = 5 × 100
D) Kc = 5 × 101
E) Kc = 5 × 1010
25) The value of the equilibrium constant for the combination of nitrogen and oxygen to make NO is 2 × 10-9. What does this tell you about the concentrations of materials in the equilibrium mixture?
A) The concentration of products exceeds the concentration of reactants.
B) The concentrations of reactants and products are equal.
C) The reactants are solids.
D) The concentration of reactants exceeds the concentration of products.
E) The products are solids.
26) Carbon monoxide binds to hemoglobin 140 times more strongly than oxygen does. What does this tell you about the equilibrium constants for the two reactions of hemoglobin with carbon monoxide and oxygen?
A) The equilibrium constant for the binding of CO is greater.
B) The equilibrium constant for the binding of oxygen is greater.
C) The concentration of carbon monoxide at equilibrium is twice that of oxygen.
D) Oxygen and carbon monoxide have the same formula mass.
E) Oxygen and carbon monoxide react with hemoglobin in different fashions.
27) For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. If the concentration of both products is 0.10 M at equilibrium, what is the concentration of the starting material, NOBr?
2NOBr(g) ? 2NO(g) + Br2(g)
A) 5 × 10-4 M
B) 2.2 × 10-4 M
C) 5 × 10-2 M
D) 2.2 × 10-2 M
E) 2.2 M
28) For the following equilibrium reaction, which cause and effect are correctly matched?
CO(g) + 2H2(g) ? CH3OH(g) + heat
A) add heat, shift right
B) add CO, shift left
C) remove CH3OH, shift left
D) remove heat, no change
E) remove H2, shift left
29) In the following gas phase reaction, what is the effect of adding more NO2 to the starting reaction mixture?
2NO2(g) ? N2O4(g)
A) It would make the reaction more endothermic.
B) It would make the reaction more exothermic.
C) It would slow the reaction down.
D) It would decrease the final quantity of products.
E) It would increase the final quantity of products.
30) The physiological equilibrium system that keeps the temperature of the body constant is called __________.
A) stimulation
B) regulation
C) metabolism
D) homeostasis
E) catalysis
