WCB Quiz: Driving Force for Reactions - DG, D G^o_stab, D G_conc,

1. Consider the reaction HCl+H₂0 --> H₃O⁺ + Cl^-. At t=0, 0.1 mol of HCl is added to 1L of water. At t=0, which favors the forward reaction? (For all questions, R/P means Reactants and Products)

a. both relative concentration of R/P AND relative reactivity of R/P. since HCl is a strong acid and completely dissociates into ions - HCl is stronger than hydronium ion; Also, no products to reverse rx.

b. neither relative concentration of R/P or relative reactivity of R/P.

c. relative concentration of R/P alone.

d. relative reactivity of R/P alone.

2. For the reaction in 1, which favors the forward reaction at equilibrium?

a. relative concentration of R/P alone.

b. relative reactivity of R/P alone. At eq., there is no HCl so concentration can't favor the forward rx. Based on relative reactivity of HCl vs H3O+, reaction still favored to go forward (even though there is no HCl).

c. both relative concentration of R/P AND relative reactivity of R/P.

d. neither relative concentration of R/P or relative reactivity of R/P.

3. For the reaction in 1, which favors the forward reaction at t=0?

a. ΔG_conc, alone

b. ΔG^o_stab alone

c. both DG^o_stab and DG_conc. Same as question 1. since HCl is a strong acid and completely dissociates into ions - HCl is stronger than hydronium ion, DG^o_stab < 0; Also, no products to reverse rx.

d. neither ΔG^o_stab and ΔG_conc.

4. For the reaction in 1, which favors the forward reaction at equilibrium?

a. ΔG_conc alone

b. DG^o_stab alone. Same as Question 2

c. both ΔG^o_stab and ΔG_conc.

d. neither ΔG^o_stab and ΔG_conc.

5. Consider the reaction CH₃COOH +H₂0 --> H₃O⁺ + CH₃COO^-. At t=0, 0.1 mol of CH₃COOH is added to 1L of water. At t=0, which favors the forward reaction?

a. relative reactivity of R/P alone.

b. relative concentration of R/P alone. Relative reactivity favors reverse rx - formation of weaker acid

c. both relative concentration of R/P AND relative reactivity of R/P.

d. neither relative concentration of R/P or relative reactivity of R/P.

6. For the reaction in 5, which favors the forward reaction at equilibrium?

a. relative reactivity of R/P alone.

b. both relative concentration of R/P AND relative reac ivity of R/P.

c. relative concentration of R/P alone. Relative reactivity still favors reverse rx.

d. neither relative concentration of R/P or relative reactivity of R/P.

7. For the reaction in 5, which favors the forward reaction at t=0?

a. DG_conc alone. Only concentration favors forward rx.

b. ΔG^o_stab alone

c. both ΔG^o_stab and ΔG_conc.

d. neither ΔG^o_stab and ΔG_conc.

8. For the reaction in 5, which favors the forward reaction at equilibrium?

a. DG_conc alone. Reactivity still favors reverse rx. At eq. , still more reactants than products

b. ΔG^o_stab alone

c. both ΔG^o_stab and ΔG_conc.

d. neither ΔG^o_stab and ΔG_conc.