Exam 1 (Answer Key)
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Utah State University *
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Course
1210
Subject
Chemistry
Date
Jun 21, 2024
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Name: CHEM 1210 1 CHEM 1210 –
Exam 1 (Chapters 1-3) Instructions:
Please ask your testing center facilitator to give you a copy of our Exam 1 Cover Sheet.pdf
(which includes a detailed periodic table) and as much scratch paper as you need. You are welcome to use as much as you want. When you are done, please turn your scratch paper into the testing center facilitator, who will scan and send it to me (your instructor). I will look it over and award you partial credit, where applicable, for calculation problems. You will also need to bring and use a calculator, or you can check one out from your testing center. You cannot use a smartphone while taking your exam. Please carefully read each problem below and then select the most correct answer from each of the multiple-choice options provided. There will be 25 total questions graded, worth 4 points each, for a total of 100 points. You will have 140 minutes (2 hours, 20 minutes)
to finish the exam. Good luck! Useful Information 1 inch = 2.54 cm 1 cup = 236.59 mL 1 m = 3.28 ft 1 mile = 1.61 km 1 pound = 454 g 1 m
3
= 1000 L 1 hour = 3600 seconds 1 day = 24 hours 1 m = 100 cm Avogadro’s number
= 6.022 × 10
23
molecules/mole K = °C + 273.15 °C = (5/9) x (°F –
32) °F = (9/5) x (°C) + 32 % yield = (actual / theoretical) × 100
Name: CHEM 1210 2 CHEM 1210 –
Exam 1 (Chapters 1-3) Disclaimer (PLEASE READ THIS): The Exam 1 you took on Canvas pulled each question from a databank of 2 to 8 questions per concept. For example, Chapter 1, Question #1
asked you to do a temperature conversion, for which Canvas randomly chose one of four different “
temperature conversion
” problems, all of equal difficulty. Canvas also randomly shuffled the order of the multiple-
choice options for each question. Thus, every student took a slightly different Exam 1, with each version presenting questions from the same concepts and difficulty levels, with their multiple-choice orders randomized. The questions and answers presented here are accordingly representative of each problem you were asked, but they might (or might not) differ slightly, including their multiple-choice orders. Questions from Chapter 1 (32 points –
8 questions) Temperature Conversions 1.
Which answer below (A –
D) represents the correct answers to questions a
, b
, and c
?
A.
How many degrees Fahrenheit is 37 degrees Celsius?
B.
How many kelvins is 25 degrees Fahrenheit?
C.
How many degrees Celsius is 98.6 degrees Fahrenheit?
A.
Answer to a
= 53 °F; Answer to b
= 2.7 × 10
2
kelvins; Answer to c
= 37 °C
B.
Answer to a
= 99 °F; Answer to b
= 261 kelvins; Answer to c
= 37 °C
C.
Answer to a
= 99 °F; Answer to b
= 270 kelvins; Answer to c
= 37 °C
D.
Answer to a
= 99 °F; Answer to b
= 2.7 × 10
2
kelvins; Answer to c
= 120 °C
Answer: C
See https://www.youtube.com/watch?v=q5vyfQTpXXU Density/Mass 2.
The density of toluene at 25 °C is 866.90 kg/m³. Please calculate the mass (in grams) of 1.2500 L of
toluene at this temperature. Then select the answer below (A –
D) that best represents the correct
answer. A.
1083.6 grams
B.
1.0836 × 10
6
grams
C.
1.0836 grams
D.
1.4419 × 10
–
3
grams
Answer: A
See https://www.youtube.com/watch?v=FMOhjQ29zCE
Name: CHEM 1210 3 Significant Figure Identifications 3.
Which of the following (A –
E) has the same number of significant figures as the number 0.003104?
A.
1 × 10
6
B. 199.791
C. 8.66
D. 5.119
E. 100
Answer: D See https://www.youtube.com/watch?v=8CEBXQFJ6As Significant Figure Calculations 4.
Which answer below (A –
D) represents the correct answer to the mathematical problem shown
below, rounded to the correct number of significant figures?
[(357.2 × 10
4
) –
(7.600 × 10
3
)] × 4.5817 A.
1.63 × 10
7
B.
1.6 × 10
7
C.
1.633 × 10
7
D.
2.0 × 10
7
Answer: B See https://www.youtube.com/watch?v=8CEBXQFJ6As Dimensional Analysis/Unit Conversion 5.
The average human bladder can comfortably hold 2.0 cups of urine. Please convert this to L. Then
select the option below (A –
D) that best represents the correct answer.
A.
8.5 × 10
–
3
L
B.
2.0 × 10
–
3
L
C.
0.47 L
D.
2.4 × 10
–
1
L
Answer: C See https://www.youtube.com/watch?v=8CEBXQFJ6As
, https://www.youtube.com/watch?v=HqgBma7QnuU
, https://www.youtube.com/watch?v=geskIln_11o
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Name: CHEM 1210 4 6.
The Eiffel Tower is 986 feet tall. Please convert this to nanometers. Then select the option below (A
–
D) that best represents the correct answer.
A.
301 nm
B.
9.86 × 10
11
nm
C.
3.05 × 10
8
nm
D.
3.01 × 10
11
nm
Answer: D
See https://www.youtube.com/watch?v=8CEBXQFJ6As
, https://www.youtube.com/watch?v=HqgBma7QnuU
, https://www.youtube.com/watch?v=geskIln_11o 7.
Bamboo can grow up to 60.0 cm/day. Please convert this growth rate into feet per second. Then
select the option below (A –
D) that best represents the correct answer.
A.
3.28 × 10
–
3
feet/second
B.
5.47 × 10
–
4
feet/second
C.
8.20 × 10
–
2
feet/second
D.
2.28 × 10
–
5
feet/second
Answer: D
See https://www.youtube.com/watch?v=8CEBXQFJ6As Dimensional Analysis/Unit Conversion Application 8.
If an electric car were capable of going 125 miles on a single charge, and you were driving from
Vernal to Logan (a distance of 407 kilometers), then how many times would you have to stop to
charge your battery along the way, assuming you started traveling with a full charge? For full credit,
you must show your work. (Note: I want a whole number, not a decimal. You can’t, for example, stop
your car three-and-a-
half times. That’s just ridiculous.)
A.
Once
B.
Twice
C.
Thrice
D.
Four times (or “frice”)
Answer: B See https://www.youtube.com/watch?v=FMOhjQ29zCE
, https://www.youtube.com/watch?v=8CEBXQFJ6As
, https://www.youtube.com/watch?v=HqgBma7QnuU
, https://www.youtube.com/watch?v=geskIln_11o
Name: CHEM 1210 5 Chapter 2 –
Atoms, Molecules, and Ions Strong Acids Names and Formulas 9.
What is the formula of chloric acid? A.
HCl
B.
ClO
3
C.
HClO
3
D.
HClO
4
Answer: C See https://www.youtube.com/watch?v=XZs_rDFYKVk
Protons, Neutrons, and Electrons 10. How many protons, neutrons, and electrons are there in a 79
Br
atom?
A.
Protons = 35; Neutrons = 35; Electrons = 44
B.
Protons = 44; Neutrons = 44; Electrons = 35
C.
Protons = 44; Neutrons = 35; Electrons = 35
D.
Protons = 35; Neutrons = 44; Electrons = 35
Answer: D See https://www.youtube.com/watch?v=rZ-1acocN_8
, https://www.youtube.com/watch?v=MbVfUxEB8lk Predicted Charges 11. What charge will the most stable ion of Calcium
form?
A. +1
B. +2
C. 0
D.
–
1
E.
–
2
Answer: B See https://www.youtube.com/watch?v=HUFfCQoU4C4
Name: CHEM 1210 6 Atomic Weight from Isotopic Abundances 12. Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the
isotopes are given in the table below. The average atomic mass of the element is __________ amu.
A. 17.20
B. 16.90
C. 17.65
D. 17.11
E. 16.90
Answer: A See https://www.youtube.com/watch?v=MbVfUxEB8lk Names and Charges from Empirical Formulas 13. What is the chemical name and charges of the cation and anion in the formula Ca(OH)
2
?
A.
Name = calcium dihydroxide; cation charge = +2; anion charge = –
2
B.
Name = calcium hydroxide; cation charge = +2; anion charge = –
1
C.
Name = monocalcium dihydroxide; cation charge = +2; anion charge = –
2
D.
Name = calcium hydroxide; cation charge = –
1; anion charge = +2
Answer: B See https://www.youtube.com/watch?v=oiSnI5tpSwk
, https://www.youtube.com/watch?v=u9zHMVUc-X4 14. What is the chemical name and charges of the cation and anion in the formula Fe(NO
3
)
2
?
A.
Name = iron (II) nitrate; cation charge = +2; anion charge = –
2
B.
Name = iron (II) dinitrate; cation charge = +2; anion charge = –
1
C.
Name = iron (II) nitrate; cation charge = +2; anion charge = –
1
D.
Name = iron dinitrate; cation charge = +2; anion charge = –
1
Answer: C See https://www.youtube.com/watch?v=oiSnI5tpSwk
, https://www.youtube.com/watch?v=u9zHMVUc-X4
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Name: CHEM 1210 7 15. What is the chemical name and charges of the cation and anion in the formula Fe
2
(SO
4
)
3
?
A.
Name = Iron (III) disulfate; cation charge = +3; anion charge = –
2
B.
Name = Iron (III) sulfate; cation charge = +3; anion charge = –
2
C.
Name = monoiron disulfate; cation charge = +3; anion charge = –
2
D.
Name = Iron (III) sulfide; cation charge = –
2; anion charge = +3
Answer: B See https://www.youtube.com/watch?v=oiSnI5tpSwk
, https://www.youtube.com/watch?v=u9zHMVUc-X4
16. What is the chemical name and charges of the cation and anion in the formula FeCl
3
?
A.
Name = iron (III) chloride; cation charge = +3; anion charge = –
3
B.
Name = iron (III) trichloride; cation charge = +3; anion charge = –
1
C.
Name = iron (III) chloride; cation charge = +3; anion charge = –
1
D.
Name = iron trichloride; cation charge = +3; anion charge = –
1
Answer: C See https://www.youtube.com/watch?v=oiSnI5tpSwk
, https://www.youtube.com/watch?v=u9zHMVUc-X4
Name: CHEM 1210 8 Chapter 3 –
Chemical Reactions and Reaction Stoichiometry Balancing Reactions and Reaction Types 1
7
. Please balance the following equation and indicate if it is a combination, decomposition,
neutralization, or combustion reaction. Then select the option below (A –
D) that best represents the
correct answers.
C
3
H
6
(g) + O
2
(g) →
CO
2
(g) + H
2
O
(g)
A.
2 C
3
H
6
(g) + 9 O
2
(g) →
6 CO
2
(g) + 6 H
2
O
(g)
; combination
B. C
3
H
6
(g) + 9 O
2
(g) →
3 CO
2
(g) + 3 H
2
O
(g)
; combustion
C. C
3
H
6
(g) + 9 O
2
(g) →
CO
2
(g) + 3 H
2
O
(g)
; decomposition
D.
2 C
3
H
6
(g) + 9 O
2
(g) →
6 CO
2
(g) + 6 H
2
O
(g)
; combustion
Answer: D See https://www.youtube.com/watch?v=MXhWwrPvXaQ
, https://www.youtube.com/watch?v=M00xcSHffvI
Percent Composition 18.
Calculate the percentage composition, by mass, OF CARBON in Taxol, an anti-cancer drug whose
formula is C
47
H
51
NO
14
. Then select whichever answer (A –
D) best represents the correct answer.
A.
1.64%
B.
66.1%
C.
5.98%
D.
6.36%
Answer: B See https://www.youtube.com/watch?v=FoExI53xoaM
, https://www.youtube.com/watch?v=M00xcSHffvI
Atom-Mole-Molecules-Mass Interconversions 19.
How many molecules of CH
4
are in 48.2 g of CH
4
?
A.
5.00 × 10
24
CH
4
molecules
B.
3.00 CH
4
molecules
C.
2.90 × 10
25
CH
4
molecules
D.
1.81 × 10
24
CH
4
molecules
E.
4.00 CH
4
molecules
Answer: D See https://www.youtube.com/watch?v=3iCqCZMeL60
, https://www.youtube.com/watch?v=tWdCBgtbUm8
Name: CHEM 1210 9 Formulas from Mass Compositions 20. What is the empirical formula of a compound with mass compositions of: 40.0% C, 53.29% O, and
6.71% H?
A.
COH
2
B.
COH
C.
C
2
O
2
H
2
D.
2COH
Answer: A See https://www.youtube.com/watch?v=GDx_GVqMLAY
, https://www.youtube.com/watch?v=HUFfCQoU4C4
, https://www.youtube.com/watch?v=FoExI53xoaM
Molecular Formulas from Empirical Formulas 21. A molecule has an empirical formula of COH
2
. What is its molecular formula, if its molar mass is 60.05
g/mol?
A.
COH
2
B.
C
3
O
3
H
6
C.
COH
D.
C
2
O
2
H
4
Answer: D See https://www.youtube.com/watch?v=GDx_GVqMLAY
, https://www.youtube.com/watch?v=HUFfCQoU4C4
, https://www.youtube.com/watch?v=FoExI53xoaM
Molar Amounts from Balanced Equations 2
2
.
The decomposition reaction of NaN
3
is used as to rapidly produce N
2
gas, which fills airbags during
car collisions. Using the balanced chemical equation for this reaction below, how many moles of N
2
are produced when 12.87 moles of NaN
3
decompose in this reaction? NaN
3
→
2 Na + 3 N
2
A.
19.3 moles of N
2
B.
77.22 moles of N
2
C.
8.58 moles of N
2
D.
2.15 moles of N
2
Answer: B
See https://www.youtube.com/watch?v=NCm1_9Z0L2w
, https://www.youtube.com/watch?v=QYHAg2BVDkA
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Name: CHEM 1210 10 Limiting Reactants 2
3
.
Calcium hydroxide reacts with nitric acid as follows:
Ca(OH)
2
(s)
+ 2 HNO
3
(aq)
→
Ca(NO
3
)
2
(aq)
+ 2 H
2
O
(l)
Which is the limiting reactant when 1.35 mol Ca(OH)
2
and 2.24 mol HNO
3
are allowed to react?
A. Ca(OH)
2
B. HNO
3
Answer: B See https://www.youtube.com/watch?v=W3OeXNWoxWc
Percent Yield 2
4
.
Sulfur and oxygen react to produce sulfur trioxide. In a particular experiment, 20.0 grams of S and of
15.0 grams of O
2
are reacted with each other, and only 18.0 grams of SO
3
are produced. What is the
% yield of SO
3
in this experiment?
S (s)
+ O
2
(g)
→
SO
3
(g)
(not balanced) A. 36
B. 72
C. 24
D. 32
E. 7.0
Answer: B See: https://www.youtube.com/watch?v=E2o26rAtUaY
, https://www.youtube.com/watch?v=3iz1DS74w8M
, https://www.youtube.com/watch?v=f2JU5W57kWo
, https://www.youtube.com/watch?v=jOY_9YsjTQ8
, https://www.youtube.com/watch?v=eXzZYrAEDlg
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