CHM 1045 - Practice Exam 2.
Instructions. There are 20 multiple choice questions on the exam. For the multiple choice questions circle
your answer
NA = 6.022 x 1023
1 amu = 1.661 x 10-27 kg
C = (5/9) (F – 32)
C = K - 273.15
F = (9/5)(C) + 32
K = C + 273.15
______________________________
Name (print)
______________________
Panther ID
1) The percent yield in a particular chemical reaction was 63.8 %. If the actual yield of
product was 28.74 g, then the theoretical yield for the reaction was
a) 2.22 g
d) 63.8 g
b) 18.3 g
e) 79.4 g
c) 45.0 g
2) Iron metal can be produced from iron III oxide by the reaction
Fe2O3(s) + 3 CO(g)  2 Fe(s) + 3 CO2(g)
What is the maximum amount of iron metal that can be produced from 86.8 kg of Fe 2O3?
a) 30.4 kg Fe
d) 69.4 kg Fe
b) 34.7 kg Fe
e) 248. kg Fe
c) 60.7 kg Fe
3) Which of the following is a nonelectrolyte?
a) CH3CH2OH
d) Both a and c
b) H2SO4
e) Both b and c
c) Sr(OH)2
4) Which of the following ionic compounds is soluble?
a) AgBr
d) PbI2
b) CuCl2
e) Zn(OH)2
c) Mg(OH)2
5) Which of the following is a strong acid?
a) HCl
d) Both a and b
b) HF
e) Both a and c
c) HClO2
6) The net ionic equation for the reaction of NaCl(aq) with Pb(NO 3)2(aq) is
a) 2 NaCl(aq) + Pb(NO3)2(aq)  2 NaNO3(aq) + PbCl2(aq)
b) 2 NaCl(aq) + Pb(NO3)2(aq)  2 NaNO3(aq) + PbCl2(s)
c) 2 Na+(aq) + Pb(NO3)2(aq)  2 NaNO3(s) + Pb2+(aq)
d) 2 NaCl(aq) + Pb2+(aq)  2 Na+(aq) + PbCl2(aq)
e) Pb2+(aq) + 2 Cl-(aq)  PbCl2(s)
7) For the acid-base reaction
_____ HBr + _____ Ba(OH)2  _____ BaBr2 + _____ H2O
The coeffficient that balance the above reaction are, in order
a) 1, 1, 1, 1
d) 2, 1, 1, 2
b) 1, 2, 1, 2
3) 2, 1, 2, 1
c) 1, 2, 2, 1
8) For which of the following does nitrogen have the largest value for oxidation number?
a) HNO2
d) NO
b) HNO3
e) NO2
c) N2
9) Which of the following is an oxidation-reduction reaction?
a) CH4(g) + 2 O2(g)  CO2(g) + 2 H2O(l)
d) Both a and b
b) Ni2+(aq) + Zn(s)  Ni(s) + Zn2+(aq)
e) Both b and c
c) Fe3+(aq) + 3 OH-(aq)  Fe(OH)3(s)
10) A solution is prepared by dissolving 13.8 g of NaCl in water. The final volume of the
solution is 250.0 mL. The molarity of NaCl in the solution is
a) 0.0552 M NaCl
d) 0.945 M NaCl
b) 0.0590 M NaCl
e) 1.06 M NaCl
c) 0.236 M NaCl
11) A 20.00 mL sample of a solution of H3PO4 is titrated with a 0.186 M solution of
NaOH. The equivalence point for the titration occurs after the addition of 36.44 mL of
the NaOH solution. The concentration of the H3PO4 solution is
a) 0.102 M
d) 0.339 M
b) 0.113 M
e 1.02 M
c) 0.306 M
12) How many mL of a 0.284 M solution of potassium nitrate (KNO 3) is needed to
prepare 400.0 mL of a 0.100 M solution of KNO3?
a) 35.2 mL
d) 259. mL
b) 114. mL
e) 350. mL
c) 141. mL
13) Which of the following is a state function?
a) U (internal energy)
d) Both b and c
b) q (heat)
e) None of these is a state function
c) w (work)
14) 48.4. J of heat is added to a 15.45 g metal block. The temperature of the block
increases by 12.8 C. The specific heat of the metal is
a) 0.245 J/gC
d) 3.78 J/gC
b) 0.828 J/gC
e) 4.09 J/gC
c) 3.13 J/gC
15) Which of the following reactions is a formation reaction?
I.
II.
III.
Cu(s) + Cl2(g)  CuCl2(s)
Pb(s) + 1/2 O2(g)  PbO(s)
PCl3(g) + Cl2(g)  PCl5(g)
a) I only
d) Both I and II
b) II only
e) Both I and II and III
c) III only
16) A system gives off 440. J of heat to the surroundings and performs 210. J of work on
the surroundings. The value for U for the process is
a) + 650. J
d) - 230. J
b) + 230. J
e) - 650. J
c) 0. J
17) Given
Hf(C2H4(g)) = 52.3 kJ/mol
Hf(CO2(g)) = - 393.5 kJ/mol
Hf(O2(g)) = 0.0 kJ/mol
Hf(H2O(l)) = - 285.8 kJ/mol
what is H for the reaction
C2H4(g) + 3 O2(g)  2 CO2(g) + 2 H2O(l)
a) 26.0 kJ/mol
d) - 1306.3 kJ/mol
b) - 627.0 kJ/mol
e) - 1410.9 kJ/mol
c) - 731.6 kJ/mol
18) An FM radio station operates at a frequency of 88.5 MHz.
corresponding to this frequency is
The wavelength
a) 0.295 nm
d) 3.39 nm
b) 0.295 m
e) 3.39 m
c) 26.5 nm
19) A hydrogen atom initially in the n = 6 state emits a photon of light of wavelength  =
2624. nm. The value for n after emission of the photon is
a) n = 1
b) n = 4
c) n = 2
d) n = 5
e) n = 3
20) Which of the following regions of the electromagnetic spectrum has photons with the
highest energy per photon?
a) gamma ray region
b) visible region
c) infrared region
d) X-ray region
e) microwave region
Answers:
1) C
2) C
3) A
4) B
5) A
6) E
7) D
8) B
9) D
10) D
11) B 12) C 13) A 14) A 15) D 16) E 17) E 8) E
9) B
20) A