Download 20 MCQs on General Chemistry II with Answers Key - Exam 2 | CHEM 1120 and more Exams Chemistry in PDF only on Docsity!
Circle the correct answer on your answer sheet. Refer to the attached sheets to obtain
any equalibrium constants or thermodynamic values that are required.
- Calculate the pH of a solution that is 0.4596 M in LiHCOO.
a) 7.98 b) 3.42 c) 10.58 d) 5.29 e) 8.
M in NH 4
- Calculate the pH of a solution that is 0.2432 Cl.
a) 4.92 b) 7.09 c) 4.15 d) 9.85 e) 9.
- Calculate the endpoint pH of a solution which results from the titration of a solution of
trimethyl amine, (CH 3
3
N with nitric acid, HNO 3
. Since both solutions start out to be
approximately 0.1 M, then the resulting solution is about 0.050 M.
a) 8.50 b) 11.25 c) 2.75 d) 1.45 e) 5.
- What is the pH of the partial titration of HCN with NaOH with the following amounts
being used?
Volume of HCN starting = 25.00 mL
M
Concentration of HCN = 0.
Volume of NaOH used = 13.99 mL
M
Concentration of NaOH = 0.
a) 9.45 b) 4.55 c) 9.18 d) 9.10 e) 7.
- What is the pH of a solution formed at the equivalence point in the titration of
NaOH with HCl? The initial concentrations of both were about 0.10 M.
a) 9.93 b) 5.00 c) 7.00 d) 8.82 e) 2.
- What is the pH of the two 1:1 buffers of sulfurous acid, H 2
SO
3
a) 12.23 and 10.
b) 1.77 and 3.
c) 13.12 and 6.
d) 0.88 and 6.
e) 1.77 and 7.
- Calculate the NH 3
concentration necessary to dissolve AgCl to the extent of
M. The K f
for the Ag(NH 3
2
M. with the Cl
ion concentration as:
ion is 1.0 x 10
8
. The K sp
for AgCl is 1.8 x 10
AgCl + 2NH 3 º Ag(NH 3 ) 2
a) 1.88 b) 11.87 c) 4.68 d) 0.88 e) 3.
- How much energy does it take to increase the temperature of 446 g of copper from
o
C? The C p
for copper = 25.0 J mol
K
o
C to
a) 2.0kJ b) 29.3kJ c) 40.5kJ d) 8.0kJ e) 19.3 kJ
- What is the enthalpy change, )))) r
H
o
, for the reaction: C 2
H
4
+ 6F
2
! 2CF
4
+ 4HF?
(The units for the answer are kJ mol
a) 2986.1 b) -2881.5 c) -1143.5 d) -1248.1 e) -2986.
- What is the entropy change, )))) r
S
o
, for the reaction: C 2
H
4
+ 6F
2
! 2CF
4
+ 4HF?
(The units for the answer are J mol
K
a) 221.0 b) 452.0 c) 13.0 d) -218.0 e) 218.
- In the following the reaction: N 2
H
4
+ 4O
2
! 2NO
2
+ 4H
2
O(g) , the )))) r
H
o
for the
kJ mol 222.
and the )))) r
S
o
-854.7 is reaction at 298
o
C is J mol
K
M in sodium acetate, NaCH 3
- What is the pH of a solution which is0.920 COO and
1.21 M acetic acid, CH3COOH?
a) 4.87 b) 4.76 c) 4.64 d) 11.66 e) 2.
M in sodium acetate, NaCH 3
- What is the pH of a solution which is0.50 COO and
0.50 M acetic acid, CH3COOH?
a) 11.47 b) 2.53 c) 5.06 d) 4.46 e) 4.
- The following are the pK a
s for some indicators:
methyl red = 5.
bromothymol blue = 7.
thymol blue = 8.
phenolphthalein = 9.
thymolphenolein = 10.
Which one of these indicators would be the best for a titration of HCl with NaOH
based only upon its pK a
a) thymol blue
b) methyl red
c) bromothymol blue
d) thymolphenolein
e) phenolphthalein
Test 2 for CHEM 1120 - General Chemistry II, Spring 2004 copy 1025 Answers
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