Download Final Exam Problem set

FINAL EXAM
PROBLEM SET
Chapter 17
Chemical Equilibrium
1.
Write the equilibrium constant expression for the following:
a. P4(g) + 6H2 (g) ↔ 4PH3 (g)
b. NH4Cl(s) ↔ NH3(g) + HCl(g)
c. SO3(g) + H2O(l) ↔ H2SO4 (l)
2. Calculate Keq given the following equilibrium concentrations.
a. H2(g) + I2 (g) ↔ 2HI(g)
[H2] = 0.0109
[I2] = 0.00290
[HI] = 0.0460
b. I2(g) ↔ I2(s)
[I2](g) = 0.0665
3. Determine the concentration of the missing species using the equation PCl 5 (g) ↔ PCl3 (g) + Cl2 (g). Keq = 0.0211
a. [Cl2] = ?
[PCl5] = 0.865
[PCl3] = 0.135
b. [PCl5] = ?
[PCl3] = 0.100
[Cl2] = 0.200
4. For the reaction NH4Cl (s) ↔ HCl (g) + NH3 (g) , Keq = 0.011. At a particular time, the following concentrations
are measured:
[HCl] = 2.5 x 10-1 M and [NH3] = 6.2 x 10-2 M. Is this reaction at equilibrium? If not, which
way must it shift to get to equilibrium? Show your work.
Chapter 18
5.
6.
7.
8.
9.
Acids and Bases
Determine the ACID, BASE, CONJUGATE ACID, and CONJUGATE BASE for each.
a. H2O + CH3NH2  OH-1 + CH3NH3+1
b. Zn + 2HNO3  Zn(NO3)2 + H2
c. MgCO3 + H2SO4  MgSO4 + H2CO3
Write the steps for the complete ionization of the polyprotic acid, H 2S.
Determine the ionization equation and the ionization constant expression for:
a. HCO3-1
b. NH3
Calculate the following and then tell if it is ACIDIC, BASIC, or NEUTRAL:
a. pH = ? if [H3O+] = 1.0 x 10-5
b. pH = ? if [OH-1] = 1.0 x 10-11
c. pH = ? if [H3O+] = 4.5 x 10-4
d. pH = ? and pOH = ? if [OH-1] = 8.8 x 10-3
Calculate the missing Molarity.
a. In a titration, 15.73mL of 0.2346M HI solution neutralizes 20.00mL of a LiOH solution. What is the
molarity of LiOH?
b. What is the molarity of a caustic soda (NaOH) if 35.00mL of solution is neutralized by 68.30mL of 1.250
HCl?
Chapter 19
Oxidation and Reduction
10. For each of the following, identify what is oxidized, what is reduced, what is the reducing agent and what is the
oxidizing agent.
a. 2P + 3Cl2  2PCl3
b. C + H2O  CO2 + H2
c. ClO3-1 + AsO2-1  AsO4-3 + Cl-1
11. Determine the oxidation number for each element in the following substances.
a. Na2SeO3
b. HAuCl4
c. H3BO3
d. C2H3O2-1
12. Balance the following reactions using the oxidation number or bracket method
a. Zn + HCl  ZnCl2 + H2
b. Al2O3 + C + Cl2  AlCl3 + CO
13. Balance the following reactions using the half-reaction method.
a. MnO4-1(aq) + CH3OH(g)  MnO2(aq) + HCHO(g)
b. SeO3-2 + I-1  Se + I2