1.) The figure schematically represents a living cell. The minimum work required

Question

1.) The figure schematically represents a living cell. The minimum work required to transfer one mole of K+ cation from the cell interior solution to the exterior solution through the membrane can be calculated from the difference between the

a) Ionic strengths of the two solutions

b) Chemical potentials of K+ in the two solutions

c) Entropies of solutions of K+ at the two concentrations

d) Enthalpies of solutions of K+ at the two concentrations

2.) For the liquid-phase reaction A + B C + D, it was found that lowering temperature from 300 K to 250 K is results in the decrease of the equilibrium constant from K = 10 to K = 5.

What must be true for this reaction?
a) H0 =0 B)H0 <0 C)H0 >0 D)G0 >0

3.) Consider a container of volume 20.0 dm3 that is divided into two compartments of equal size. In the left compartment there is nitrogen at 1.0 atm and 25 C; in the right compartment there is oxygen at the same temperature and pressure. What is true for the process occurring when the partition is removed. Assume that the gases are perfect.

a) H<0 b) S<0 c) G<0 d) p<0

4.) For the exothermic reaction 2NO (g) + Br2 (g) ---> 2NOBr (g) in equilibrium, which of the
following will lead to an increase in the numbers of moles of NO(g)?

a)Decreasing temperature and keeping total pressure constant

b)Increasing temperature and keeping total pressure constant

c) Increasing total pressure and keeping temperature constant
d)Adding Br2 and keeping temperature and total pressure constant

e) Removing NOBr and keeping temperature and total pressure constant

Explanation / Answer

1)d

2)d

3)c

4)a

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