CHEM 123 Winter 2023 Exam: Test Version E Instructions
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University of Waterloo *
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Chemistry
Date
Jun 10, 2024
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10
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1.
Print your name, ID number and other information in the designated box on the answer sheet and test booklet. 2.
Fill in your TEST VERSION E
in the designated field on the answer sheet. 3.
Circle your answers in this test booklet and fill in the ovals on the answer sheet. Make sure any erasures are complete and clean. If you ĐĂŶŶŽƚ ĞƌĂƐĞ ĂŶ ĂŶƐǁĞƌ ŵĂƌŬ ƉůĂĐĞ ĂŶ ͞y͟ ƚŚƌŽƵŐŚ ƚŚĞ
circle. 4.
This test booklet has 19 questions and 5 double sided pages including this cover page but not the answer sheet. Check now to ensure that no pages are missing. If pages are missing, raise your hand and ask for a new test booklet.
5.
As you progress through the test, transfer your answers to the answer sheet
by filling in the appropriate circles(s) (A, B, C, D, or E) on your answer sheet. 6.
Attempt all questions. Do all rough work on this test booklet. Scrap paper is not permitted. You can remove the last page (the data sheet).
7.
At the end of the test, turn in this test booklet, your answer sheet, and the data sheet and leave as soon as you are instructed to do so. This is Version E. Fill in Test Version E on the Answer Sheet Times: Wednesday 2023-02-08 at 09:30 to 10:20
Duration: 50 minutes
Exam ID: 5276697
Sections: CHEM 123 LEC 001-003
Instructors: Conrard Giresse Tetsassi Feugmo, Laura
Ingram, Rick Marta
Please print in pen:
Waterloo Student ID Number:
WatIAM/Quest Login Userid:
Examination
Test (Version E)
Winter 2023
CHEM 123
Times: Wednesday 2023-02-08 at 09:30 to 10:20
Duration: 50 minutes
Exam ID: 5276697
Sections: CHEM 123 LEC 001-003
Instructors: Conrard Giresse Tetsassi Feugmo, Laura
Ingram, Rick Marta
CHEM 123 Winter 2023 Test
© 2023 University of Waterloo
Please initial:
Page 1 of 10
EXTRA SPACE CHEM 123 Winter 2023 Test
© 2023 University of Waterloo
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Page 2 of 10
1.
If it requires 117.74 J of heat to increase the temperature of 2.23 moles of a solid metal by 2.00 o
C at constant pressure, what is the identity of the metal? A.
W B.
Tb C.
Ac D.
Fe E.
Pb 2. A volume of gas is compressed from 25.0 L to 10.0 L using a constant external pressure of 3.5 bar. If the internal energy change for the gas is 1675 J, what is the heat flow q
? Choose the closest answer. A. + 1623 J B. ൞ ϯϱϳϱ :
C. ൞ ϲϵϮϱ :
D. + 6925 J E. 0 J 3. tŚĂƚ ŝƐ ƚŚĞ ĞŶƚƌŽƉLJ ĐŚĂŶŐĞ͕ ѐ
S,
when 1.00 mol of tetrahydrofuran, C
4
H
8
O, undergoes the process below? Choose the closest answer. C
4
H
8
O (l, 43.1 o
C, 1.00 atm) ื
C
4
H
8
O (g, 66.0 o
C, 1.00 atm) ѐ
fus
H Ăƚ оϭϬϴ
o
C ѐ
vap
H at 66.0 o
C
ܥ
ҧ
(l)
ܥ
ҧ
(g)
8.54 kJ mol
о
1
32.16 kJ mol
о
1
124.10 J mol
о
1
K
о
1
76.6 J mol
о
1
K
о
1
A. 103.5 J mol
о
1
K
о
1
B. 8.81 J mol
о
1
K
о
1
C. 53.4 J mol
о
1
K
о
1
D. 540.2 J mol
о
1
K
о
1
E. 307.1 J mol
о
1
K
о
1
p
C
/ J K
о
1
mol
о
1 Ac 27.2 Fe 25.1 Pb 26.4 Tb 28.9 W 24.3 CHEM 123 Winter 2023 Test
© 2023 University of Waterloo
Please initial:
Page 3 of 10
4. For which of the following processes does the entropy of the system increase
? Select all that apply. You may select one, more than one, or none of the answers. A. C
6
H
5
SH (g, 169 °C, 1 atm) ื
C
6
H
5
SH (l, 169 °C, 1 atm) B. C
8
H
9
NO (l, 114 °C, 1 atm) ื
C
8
H
9
NO (s, 114 °C, 1 atm) C. Zn (s, 110 °C, 1 atm) ื
Zn (s, 215 °C, 1 atm) D. O
2
(g, 0 °C, 10 atm) ื
O
2
(g, 0 °C, 2 atm) E. Hg (l, 275 °C, 1 atm) ื
Hg (l, 180 °C, 1 atm) 5. Which of the following has lowest
standard molar entropy at 298.15 K? A. CF
2
CF
2
(g) B. Cu(s) C. CH
3
OH(l) D. He(g) E. NH
4
NO
3
(s) 6. When a 0.004820 mol sample of C
8
H
18
(l) was burned in oxygen in a bomb calorimeter, the temperature of the calorimeter increased from 25.00 °C to 30.80 °C. The heat capacity of the calorimeter is 4.540 kJ K
о
1
. What is '
H
r
at 25.00 °C for the reaction below? Choose the closest answer. C
8
H
18
(l) + 25
2
O
2
(g) o
8 CO
2
(g) + 9 H
2
O(l) A. о
26.33 kJ mol
о
1
B. оϱϰϲϯ Ŭ: ŵŽů
о
1
C. оϱϯ͘ϵϵ Ŭ: ŵŽů
о
1
D. оϱϰϱϮ Ŭ: ŵŽů
о
1
E. о
5474 kJ mol
о
1
CHEM 123 Winter 2023 Test
© 2023 University of Waterloo
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Answer
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LIMIT TEST (IMPURITIES - BIOLOGICAL)
Instructions: Note the color change of each of the samples by writing blue or pink accordingly. Then give inference whether the sample is contaminated or not contaminated upon observation.
Answer the highlighted numbers.
BLANK
(Sterile distilled water)
Reference Sugar Solution
Sample A
Sample B
REPLICATE 1
BLUE
BLUE
PINK
PINK
REPLICATE 2
BLUE
PINK
BLUE
PINK
REPLICATE 3
BLUE
PINK
PINK
PINK
INFERENCE
NOT CONTAMINATED
CONTAMINATED
1
2
1.
2.
3. Which of the two samples is relatively clean of biological impurities?
4. Given the result in limit test as an analyst, what will be the final conclusion to this? Write whether rejected or accepted for each sample.
(see attached photo)
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1.28
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3006
3003
2001
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ITEM BANK: Move to Top
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0.1 ml
1 ml
1 ml
0.1 ml 1 ml
00000
Original
C.
D_
9.9 ml 99 ml 9 ml
9.9 ml 9 ml
в
D
10
1 ml
A
1 ml
1 ml
A.
000
B.
C.
D.
Original
E.
F_
1 ml
1 ml
1 ml
1 ml
21
22
23
D
1.
32
F
4
A.
B.
4,
4.
B.
3.
2.
2.
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2N₂Os (9) 4NO₂(g) + O₂(g)
O Ke =
O K₂=
O K.
OK-
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Part B
[NO₂[0₂]
N₂O₁
Ke =
[NO₂¹0₂]
N₂0₂
N₂O₁]
NO₂0₁
N₂O,
NO₂] O₂
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CI, P
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