1042_3rd Exam_1050622(A)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) For the galvanic cell reaction, expressed below using shorthand notation, what half-reaction occurs at the cathode?
Zn(s) Zn2+(aq) Ni2+(aq) Ni(s)
A) Zn2+(aq) + 2 e- Zn(s) B) Ni(s) Ni2+(aq) + 2 e-
C) Zn(s) Zn2+(aq) + 2 e- D) Ni2+(aq) + 2 e- Ni(s)
Answer: D
2) Identify the characteristics of a spontaneous reaction.
A) E°cell > 0 B) K > 1 C) G° < 0 D) all of the above
E) none of the above Answer: D
3) Which of the following is the strongest oxidizing agent?
A) Fe(s) B)ClO2(g) C)H2O2(aq) D)I2(s) E) Fe3+(aq)
Answer: C
4)The electrolysis of molten AlCl3 for 3.25 hr with an electrical current of 15.0 A produces ________ g of aluminum metal.
A) 147 B) 49.1 C) 4.55 × 10-3 D) 16.4 E) 0.606
Answer: D
5)How many kilowatt-hours of electricity are used to produce 3.00 kg of magnesium in the electrolysis of molten MgCl2 with an applied emf of 4.50 V?
A) 0.0336 B) 14.9 C) 0.0298 D) 7.4 E) 29.8
Answer: E
6) Describe the reactions during the electrolysis of water.
A) Oxygen and hydrogen are both reduced.
B) Oxygen gas is produced at the cathode, whereas hydrogen gas is found at the anode.
C) Oxygen is oxidized and hydrogen is reduced.
D) Oxygen and hydrogen are both oxidized.
E) Oxygen is reduced and hydrogen is oxidized.
Answer: C
7) What element is being oxidized in the following redox reaction?
C3H8O2(aq) + KMnO4(aq) C3H2O4K2(aq) + MnO2(aq)
A) H B) K C) O D) C E) Mn
9) Predict the species that will be reduced first if the following mixture of molten salts undergoes electrolysis.
Zn2+, Fe3+, Mg2+, Br-, I-
A) Fe3+ B) Zn2+ C) Br- D) I- E) Mg2+
Answer: A
10) Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.)
3 Cl2(g) + 2 Fe(s) 6 Cl (aq) + 2 Fe3+(aq) Cl2(g) + 2 e 2 Cl (aq) E° = +1.36 V Fe3+(aq) + 3 e Fe(s) E° = -0.04 V
A) +1.32 V B) -1.32 V C) +1.40 V D) -1.40 V E) +4.16 V
Answer: C
11)Determine the cell notation for the redox reaction given below.
3 Cl2(g) + 2 Fe(s) 6 Cl (aq) + 2 Fe3+(aq) A) Fe(s) Fe3+(aq) Cl2(g) Cl (aq) Pt
B) Cl2(g) Cl (aq) Pt Fe(s) Fe3+(aq) C) Cl (aq) Cl2(g) Pt Fe3+(aq) Fe(s) D) Fe(s) Cl2(g) Fe3+(aq) Cl (aq) Pt
E) Fe3+(aq) Fe(s) Cl (aq) Cl2(g) Pt Answer: A
12) Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Br2 and OH in the balanced reaction?
Br2(l) BrO3 (aq) + Br (aq) A) Br2 = 3, OH = 6
B) Br2 = 2, OH = 5 C) Br2 = 1, OH = 6 D) Br2 = 1, OH = 2 E) Br2 = 3, OH = 3 Answer: A
13) What is the reducing agent in the redox reaction represented by the following cell notation?
Ca(s) Ca2+(aq) Ag+(aq) Ag(s)
A) Ca(s) B) Ag+(aq) C) Ag(s) D) Pt E) Ca2+(aq)
Answer: A
14) What is the reducing agent in the redox reaction represented by the following cell notation?
Zn(s) Zn2+(aq) Ag+(aq) Ag(s)
A) Ag(s) B) Pt C) Zn2+(aq) D) Ag+(aq) E) Zn(s)
Answer: E
15) What is the oxidizing agent in the redox reaction represented by the following cell notation?
Ni(s) Ni2+(aq) Ag+(aq) Ag(s)
A) Pt B) Ni2+(aq) C) Ag(s) D) Ag+(aq) E) Ni(s)
Answer: D
16) Determine the redox reaction represented by the following cell notation.
Fe(s) Fe2+(aq) Cu2+(aq) Cu(s) A) 2 Cu(s) + Fe2+(aq) Fe(s) + 2 Cu2+(aq)
B) 2 Fe(s) + Cu2+(aq) Cu(s) + 2 Fe2+(aq) C) 3 Fe(s) + 2 Cu2+(aq) 2 Cu(s) + 3 Fe2+(aq) D) Cu(s) + Fe2+(aq) Fe(s) + Cu2+(aq)
E) Fe(s) + Cu2+(aq) Cu(s) + Fe2+(aq) Answer: E
17)What is undergoing reduction in the redox reaction represented by the following cell notation?
Pb(s) Pb2+(aq) H+(aq) H2(g) Pt
A) Pb2+(aq) B)H2(g) C) H+(aq) D) Pt E) Pb(s)
Answer: C
18) Determine the identity of the daughter nuclide from the beta decay of 9943Tc.
A) 10345 Rh B) 9944Ru C) 9541Nb D) 10044 Ru E) 9942Mo
Answer: B
19) Determine the binding energy of an O-16 nucleus. The O-16 nucleus has a mass of 15.9905 amu. A proton has a mass of 1.00728 amu, a neutron has a mass of 1.008665 amu, and 1 amu is equivalent to 931 MeV of energy.
A) 138 MeV B) 78.1 MeV C) 128 MeV D) 38.2 MeV E) 8.84 MeV
Answer: C
20) Identify the missing particle in the following nuclear equation:
21482 Pb 0 -1e + ?
A) 21481 Tl B) 21483 Bi C) 21382 Pb D) 21581 Tl E) 21582 Pb Answer: B
21) Determine the identity of the daughter nuclide from the electron capture by 5526Fe.
A) 5525Mn B) 5527Co C) 5627Co D) 5124Cr E) 5425Mn
Answer: A
22) Write a nuclear equation for the alpha decay of 23892 U.
A) 23892 U 0
-1e + 23893 Np B) 23892 U 4
2He + 23490 Th C) 23892 U 0
-1e + 23891 Pa D) 23892 U 1
0n + 23792 U E) 23892 U 0
+1e + 23891 Pa Answer: B
23) Determine the identity of the daughter nuclide from the positron emission of 116 C.
A) 105 B B) 115 B C) 126 C D) 127 N E) 117 N
Answer: B
24) Identify the nuclide that has the shortest half-life.
A) 146 C B) 22086 Rn C) 21990 Th D) 23592 U E) 23290 Th
Answer: B
25) Describe what changes occur during alpha decay.
A) The mass number and atomic number increases.
B) The mass number increases and the atomic number decreases.
C) The mass number and atomic number decreases.
D) The mass number is unchanged and the atomic number increases.
E) The mass number and atomic number do not change.
Answer: C
26) In addition to a beta particle, what is the other product of beta decay of 21482 Pb?
A) 21884 Po B) 21481 Tl C) 20080 Hg D) 21483 Bi
Answer: D
27) Determine the half-life of a nuclide that loses 38.0% of its mass in 407 hours.
A) 568 hour B) 586 hours C) 204 hours D) 291 hours E) 281 hours
Answer: B
28) If we start with 1.000 g of cobalt-60, 0.675 g will remain after 3.00 yr. This means that the half-life of cobalt-60 is ________ yr.
A) 2.03 B) 3.08 C) 7.65 D) 4.44 E) 5.30
Answer: E
29) Complete the following equation of nuclear fusion.
21H + 31H 4
2He + ______
A) 0-1n B) 00γ C) 0+1H D) 10n E) 11H
Answer: D
30) Identify the symptom that is not from radiation exposure.
A) increased cancer risk B) death
C) measles
D) weaker immune systems E) genetic effects
Answer: C
31) Name the following compound.
A) 2-ethynebutane B) 3-ethyl-1-butyne C) 1-hexyne
D) 3-methyl-4-pentyne E) 3-methyl-1-pentyne Answer: E
32) Name the following compound.
A) 3-methyl-3-propylpentane B) 3-ethyl-3-propylbutane C) 2-ethylheptane
D) nonane
E) 3-ethyl-3-methylhexane Answer: E
33) Arrange the following in order from least oxidized to most oxidized.
A) I < III < II B) II < I < III C) III < I < II D) I < II < III E) III < I = II Answer: C
34) Arrange the following in order from most oxidized to least oxidized.
A) II > I > III B) III > I > III C) I > II > III D) III > II > I E) II > I > III Answer: D
35) Molecules with the same formula but different structures are called ________.
A) structural isomers B) enantiomers C) achiral
D) racemic mixture E) diastereomers Answer: A
36) Write a balanced chemical reaction to represent the combustion of 2,2-dimethylpropane.
A)2 C3H8 + O2 3 CH4 + 2 H2O B)C5H12 + 8 O2 5 CO2 + 6 H2O C)C3H8 + 5 O2 3 CO2 + 4 H2O D)C5H12 + H2 CH4 + 2 C2H6
E)C3H8 + H2 CH4 + C2H6 Answer: B
37) Name the following compound.
A) 1-nonyne
B) 3-isopropyl-1-hexyne C) 2-methyl-4-pentyne
D) 4-methyl-3-propyl-1-pentyne E) 4-propyl-5-hexyne
Answer: B
38) Which of the following compounds is an ether?
A)
B)
C)
D)
E) Answer: E
39) Name the following compound.
A) 2-aminophenol B) 2-aminoaniline
C) 2-hydroxybenzaldehyde D) 2-methylphenol
E) 2-aminobenzoic acid Answer: A
40) How many isomers are there for C5H12 ?
A) 6 B) 4 C) 3 D) 5
Answer: C
41) Name the following compound.
A) 4-isobutyl-2-butene B) 4-isopropyl-2-butene C) 2-ethyl-4-hexane D) 3-methyl-5-hexane
E) 5-methyl-2-heptene Answer: E
42) Name the following compound.
A) propyl propanoate B) 4-hexanone C) ethyl butyl ether D) ethyl butanoate
E) hexanoic acid Answer: D
43) Choose the weak base from the compounds below.
A)CH3CH3 B)CH3SCH3 C)CH3COOH D)CH3CH2I E)(CH3)2NH
Answer: E
44) Choose the polyunsaturated fatty acid from the compounds below.
A) B)
C) D)
E)
Answer: D
45) Which of the following is an example of a ketopentose?
A)
B)
C)
D)
E)
Answer: E
46) Identify the smallest amino acid.
A) glycine B) tyrosine C) cysteine D) phenylalanine
E) aspartic acid Answer: A
47) The following is part of a DNA sequence. What is its complementary sequence?
AGTTCGAGCCT A) AGGCTCGAACT
B) TCCGAGCTTGA C) CAGTCCA D) TCAAGCTCGGA
E) AGTTCGAGCCT Answer: D
48) Which of the following is a type of nucleic acid?
A) carbohydrate B) amino acid C) DNA D) dipeptide
E) lipid Answer: C
49) Which of the following link together amino acid units?
A) hydrogen bonds B) sulfide linkages C) glycosidic linkages D) ester linkages
E) peptide bonds Answer: E
50) Choose the polyunsaturated triglyceride from the compounds below.
A) B)
C)
D)
E)
Answer: D
