Entropy and Free Energy Multiple Choice Test
Click in the appropriate box for each question, then click "Done" at the bottom. 10 marks for each correct answer. Hints cost 5 marks each.
1. A Reaction which has a positive value of DS: Will never proceed Will always proceed Absorbs heat from the surroundings Has a negative value of DG Will proceed as long as DH is not too positive
2. A reaction which has a negative value of DS: Will never proceed Will always be slow Might proceed if DH is large and negative Might proceed if DH is large and positive Will always proceed
3. A reaction with a negative value of DG: Is spontaneous Is fast Is slow Is not spontaneous None of these
4. A reaction with a small positive value of DG: Has mostly products at equilibrium Has no products at all at equilibrium Has mostly reactants at equilibrium Has no reactants at equilibrium Will never reach equilibrium
5. A reaction has a positive value of DS and a negative value of DH. Under what circumstances is this reaction spontaneous? Under no circumstances At low temperature At high temperature At all temperatures None of the above
6. The temperature at which the free energy change of a reaction is zero: Can not be predicted Is equal to DS/DH Is equal to DH/DS Is equal to DG/DH Is equal to DS/DG
7. A certain reaction has a negative value of DG. The relationship between the equilibrium constant for the reaction and temperature is: As T increases, Keq increases As T increases, Keq decreases Keq is independent of T
8. For the reaction 4 CO(g) + 2 SO2(g) ¾ 2 SO2(g) + S2(g), which way will the equilibrium shift if the pressure is increased?
Left Right No shift will occur
9. For the endothermic reaction 4 PCl3(l) ¾ P4(s) + 6 Cl2(g), which way will the equilibrium shift if the temperature is increased?
10. For the reaction 2 SO2(g) + O2(g) ¾ 2 SO3(g), which way will the equilibrium shift if some of the SO3(g) is removed via another reaction?