State University of New York at Binghamton, Department of Chemistry Chemistry 108, Introductory Chemistry II, Exam 3, Version A
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Chemistry 108
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State University Of New York - Binghamton
State University of New York at Binghamton, Department of Chemistry Chemistry 108, Introductory Chemistry II, Exam 3, Version A
1. A reaction will always be spontaneous if:
a. H is + & S is +
b. H is – & S is –
c. H is – & S is +
d. H is + & S is –
e. H is...
version a 1 a reaction will always be spontaneous if a h is amp s is b
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State University of New York at Binghamton, Department of Chemistry
Chemistry 108, Introductory Chemistry II, Exam 3, Version A
1. A reaction will always be spontaneous if:
a. H is + & S is +
b. H is – & S is –
c. H is – & S is +
d. H is + & S is –
e. H is + & S is 0
2. In the following reaction, which substance is behaving as a reducing agent?
Cr2O72 (aq) + 3Ni(s) + 14H+(aq) 3Ni2+(aq) + 2 Cr3+(aq) + 7H2O
a. Cr2O72
b. Ni
c. H+
d. Ni2+
e. Cr3+
3. △Ho = 131.3 kJ/mol and △So = 133.6 J/(K·∙mol) for the reaction:
C(s) + H2O(g) ⭢ CO(g) + H2 (g)
This reaction will be spontaneous (under standard conditions) at temperatures above:
a. 273 C
b. 552 C
c. 325 C
d. 583 C
e. 710 C
,4. In a voltaic cell, electrons flow from the to the through the
.
a. anode, cathode, salt bridge
b. cathode, salt bridge, wire
c. cathode, anode, wire
d. cathode, anode, salt bridge
e. anode, cathode, wire
5. In the reaction: Co3+ + 6NH3 → Co(NH3)63+ , the Co3+ cation acts as …..
a. a Lewis base
b. a Lewis acid
c. a coordination complex
d. a ligand
e. an active metal
6. In a spontaneous process, which of the following always increases?
a. the entropy of the system
b. the entropy of the surroundings
c. the entropy of the universe
d. the entropy of the system and the universe
e. the entropy of the system, surroundings and the universe
7. What is the charge on the complex anion in Mg(NH4)2[Fe(CN)6]
a. -‐2
b. -‐3
c. -‐4
d. +2
e. +4
, 8. In a biochemical reaction, A + B → C with ΔG°rxn = 30 kJ/mol. Which of the following
reactions might be effectively coupled to this reaction so that it becomes more
spontaneous?
I. C + D → B + E ΔG°rxn = –40 kJ/mol
II. C + D → B + E ΔG°rxn = +40 kJ/mol
a. I only
b. II only
c. I or II
d. Neither I nor II can increase spontaneity
e. No coupling is required as the reaction is already spontaneous
9. Which of the following square-‐planar complexes would have enantiomers?
a. Pt(NH3)42+
b. PtCl42–
c. Pt(NH3)2Cl2
d. Pt(NH3)3Cl
e. None have enantiomers.
10. If 1 mol of ice melts at its melting point of 273 K, the entropy change for the ice is 22.0
J/K. If the ice melts in someone’s hand at 34°C, what is the change in the entropy of the
universe? Assume a final temperature for the water of 0°C. The enthalpy of fusion for ice
is 6.01 kJ/mol.
a. +19.6 J/K
b. –19.6 J/K
c. +2.4 J/K
d. –2.4 J/K
e. +41.5 J/K
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