6) Which of the following processes are spontancous? L. dissolving more solune i

Question

6) Which of the following processes are spontancous? L. dissolving more solune in an unsaturated solution dissolving more solute in a saturated solution IIL. dissolving more solute in a supersaturated solution Il. A) none of these B)1 C) I and II D) 1, II, and 111 7) For which of the following will the entropy of the system increase? A) condensation of steam B) reaction of magnesium with oxygen to form magnesium oxide C) reaction of nitrogen and hydrogen to form ammonia D) sublimation of dry ice 8) What is the reduction half-reaction for the following overall cell reaction? Ni2+(aq) + 2 Ag(s) Nics) + 2 Ag+(aq) B) Ag+(av) + e- Ag(s) C)Ni2+(aq) + 2e. Ni(s) the reaction 9) A galvanic cell employs and NaNO; is the salt used in the salt bridge. During the course of the reaction A) Na leaves the salt bridge and enters the anode compartment. B) NaNO3 leaves the salt bridge and enters the anode compartment. C) Nat leaves the salt bridge and enters the cathode compartment D) NaNO3 leaves the salt bridge and enters the cathode compartment. 10) What is the relation between AG" and Eo for the cell reaction below? Ni2Tay) + Cd(s)--Cd2+(aq) + Ni(s) I 1) Prediet the sign of AS of the system for both of the following. 1, 11. 2 C(graphite) + O2(g) 2 CO(g) C4H10(g) C4H10(l) A) AS should be negative for I and negative for II. B) AS should be negative for I and positive for I1. C) AS should be positive for I and negative forII. D) AS should be positive for I and positive for 11. 12) Predict the sign of AS for each of the following processes, which occur at constant temperature I. The volume of 2.0 moles of Il. The pressure of 2.0 moles of O2(g) increases from 1.0 atm to 1.2 atm A) I: AS negative; I1: AS negative B) I: As negative; I1: AS positive C) L:AS- positive; I1: AS negative D)I:AS- positive; Il: AS positive

Explanation / Answer

6. B) I Dissolving more solute in an unsaturated solution is spontaneous

7. D) Sublimation of dry ice (increase in entropy)

8. C) Ni+2(aq) + 2e -----> Ni (s)

9. C) Na+ leaves the salt bridge and enters the cathode compartment

10. D) Delta Go = - 2FEo

11. C) Delta S should be positive for I and negative for II

12. C) I: Delta S = positive; II: Delta S = Negative

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