Assignment:
Q1. If ΔG is negative, a reaction is spontaneous in the forward direction. A reaction that is not spontaneous at low temperature can become spontaneous at high temperature if ΔH is ________ and ΔS is ________.
a. -, -
b. +, +
c. +, 0
d. -, +
e. +, -
Q2. Which one of the following statements is true about the equilibrium constant for a reaction if ΔG° for the reaction is negative?
a. K = 1
b. K > 1
c. More information is needed.
d. K = 0
e. K < 1
Q3. Which element is oxidized in the reaction below?
Fe(CO)5(l) + 2HI(g) →Fe(CO)4I2(s) + CO(g) + H2(g)
a. Fe
b. C
c. H
d. O
e. I
Q4. Which substance is the reducing agent in the reaction below?
Pb + PbO2 + 2H2SO4→ 2PbSO4 + 2H2O
a. H2O
b. PbO2
c. PbSO4
d. Pb
e. H2SO4
Q5. What is the oxidation state of manganese in manganese dioxide?
a. +7
b. +2
c. +1
d. +3
e. +4
Q6. What is the coefficient of the permanganate ion when the following equation is correctly balanced?
MnO4- + Br- →Mn2+ + Br2 (acidic solution)
a. 3
b. 1
c. 5
d. 2
e. 4
Q7. The balanced half-reaction in which dichromate ion is reduced to chromium (III) ion is a __________ process.
a. four-electron
b. six-electron
c. two-electron
d. three-electron
e. twelve-electron
Q8. Which of the following transformations could take place at the cathode of an electrochemical cell?
a. HNO2
b. Br2 -> BrO3-
c. HSO4- -> H2SO3
d. Mn2+ _> MnO4-
e. MnO2 -> MnO4-