Question 1
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Aluminum sulfate, Al2(SO4)3, is used in tanning leather, purifying water, and the
manufacture of
... [Show More] antiperspirants. Calculate its formula mass.
Select one:
A. 342.17 amu
B. 315.15 amu
C. 278.02 amu
D. 74.98 amu
E. 450.06 amu
Question 2
Correct
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Calculate the molar mass of sulfuric acid.
Select one:
A. 98.086 g/mol
B. 49 g/mol
C. 81.078 g/mol
D. 41 g/mol
E. None of the answers is correct.
Straighterline CHEM101 General Chemistry I Graded Exam 2 (New Version June 2024)
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CHEM101_MH_V6 | Topic 9: Energy Changes in Chemical Reactions
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GradeQuestion 4
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Balance the following equation for the combustion of benzene:
C6H6(l) + O2(g) → H2O(g) + CO2(g)
Select one:
A. C6H6(l) + 9O2(g) → 6H2O(g) + 6CO2(g)
B. 2C6H6(l) + 9O2(g) → 6H2O(g) + 12CO2(g)
C. C6H6(l) + 9O2(g) → 3H2O(g) + 6CO2(g)
D. C6H6(l) + 15O2(g) → 3H2O(g) + 6CO2(g)
E. 2C6H6(l) + 15O2(g) → 6H2O(g) + 12CO2(g)
Question 3
Correct
5.00 points out
of 5.00
Aluminum metal reacts with chlorine gas to form solid aluminum chloride. What mass of
chlorine gas is required to react completely with 163 g of aluminum?
Select one:
A. 214 g
B. 643 g
C. 428 g
D. 321 g
E. 286 gQuestion 6
Correct
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What is the mass of 7.80 × 1018 carbon atoms? (NA = 6.022 × 1023 mol–1)
Select one:
A. 7.80 × 1018 g
B. 6.43 × 103 g
C. 1.56 × 10–4 g
D. 12.01 g
E. 1.30 × 10–5 g
Question 5
Correct
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Once the following equation is balanced with the smallest set of whole number
coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of
one.)
SF4 + H2O → H2SO3 + HF
Select one:
A. 4
B. 9
C. 6
D. 7
E. None of these answers is correct.Question 8
Incorrect
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A system which does work on the surroundings with no heat change (i.e., q = 0) has
Select one:
A. w > 0, ΔU > 0.
B. w < 0, ΔU < 0.
C. w < 0, ΔU = 0.
D. w > 0, ΔU < 0.
E. w < 0, ΔU > 0.
Question 7
Correct
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Balance the following equation:
C8H18O3(l) + O2(g) → H2O(g) + CO2(g)
Select one:
A. C8H18O3(l) + 11O2(g) → 9H2O(g) + 8CO2(g)
B. 2C8H18O3(l) + 22O2(g) → 9H2O(g) + 16CO2(g)
C. 2C8H18O3(l) + 17O2(g) → 18H2O(g) + 16CO2(g)
D. C8H18O3(l) + 13O2(g) → 18H2O(g) + 8CO2(g)
E. C8H18O3(l) + 8O2(g) → 9H2O(g) + 8CO2(g)Question 10
Correct
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Aluminum oxide can be reduced to aluminum metal using carbon, the other reaction
product being carbon monoxide. What is the enthalpy change if 12.50 g of aluminum is
produced by this method?
Substance
CO(g)
Al2O3(s)
–110.5
–1669.8
Select one:
A. 310.0 kJ
B. 412.4 kJ
C. 386.8 kJ
D. 773.6 kJ
E. 824.8 kJ
Question 9
Correct
5.00 points out
of 5.00
An important step in the synthesis of nitric acid is the conversion of ammonia to nitric
oxide according to the following balanced chemical equation. What is ΔH°rxn for this
reaction?
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)
Substance
NH3(g)
NO(g)
H2O(g)
(kJ/mol)
–46.3
90.3
–241.8
Select one:
A. –240.2 kJ/mol
B. –1274.8 kJ/mol
C. –197.8 kJ/mol
D. –904.4 kJ/mol
E. 197.8 kJ/molQuestion 12
Correct
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Two solutions (the system), each with a volume of 25.0 mL at 25.0°C, are mixed in a
beaker. A reaction occurs between them, and the temperature rises to 35.0°C. After the
products have equilibrated with the surroundings, the temperature is again 25.0°C and the
total volume is 50.0 mL. No gases are involved in the reaction. Which relationship
concerning the change from initial to final states (both at 25.0°C) is correct?
Select one:
A. w = 0
B.
C.
D.
E. q = 0
Suppose a new metallic element X is discovered, and its reactions with oxygen gas and
chlorine gas at 298 K are studied.
Trial Reaction ΔH°rxn (kJ/mol)
1 4X(s) + 3O2(g) → 2X2O3(s) 600
2 2X(s) + 3Cl2(g) → 2XCl3(s) 800
3 4XCl3(s) + 3O2(g) → 2X2O3(s) + 6Cl2(g) 200
However, it is later discovered that one of the samples was contaminated, and the ΔH°rxn
value from this trial is not reliable. Which trial had the contaminated sample, and what
should the correct value of ΔH°
rxn be for this trial?
Select one:
A. Trial 1 had the contaminated sample; its ΔH°rxn value should be –900 kJ/mol.
B. Trial 2 had the contaminated sample; its ΔH°rxn value should be +100 kJ/mol.
C. Trial 3 had the contaminated sample; its ΔH°rxn value should be +1000 kJ/mol.
D. Trial 3 had the contaminated sample; its ΔH°rxn value should be –1000 kJ/mol.
E. Not enough information is provided; all three trials must be redone.
Question 11
Correct
5.00 points out
of 5.00Question 14
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of 5.00
What is the molecular geometry of NO2– as predicted by the VSEPR model?
Select one:
A. tetrahedral
B. bent
C. trigonal pyramidal
D. linear
E. trigonal planar
Question 15
Correct
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Consider the species N2–, N2, and N2+. Which of these species will be paramagnetic?
Select one:
A. N2+ and N2–
B. N2 and N2–
C. N2–, N2, and N2+
D. N2+ and N2
E. None is paramagnetic.
Question 13
Correct
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To which one of the following reactions, occurring at 25°C, does the symbol ΔH°f
[H2SO4(l)] refer?
Select one:
A. H2(g) + S(s) + 2 O2(g) < ---- > H2SO4(l)
B. H2(g) + S(g) + 2 O2(g) <---- > H2SO4(l)
C. 2 H(g) + S(g) + 4 O(g) <---- > H2SO4(l)
D. H2SO4(l) < ---- > H2(g) + S(s) + 2 O2(g)
E. H2SO4(l) < ---- > 2 H(g) + S(s) + 4 O(g)Question 17
Correct
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What does the abbreviation VSEPR stand for?
Select one:
A. Very Selective Electron Pair theory
B. Valence Shell for Every Proton
C. Very Specific Electron and Proton Repair
D. Valence-Shell Electron-Pair Repulsion
E. Variable Selective of Electron and Protons
Question 18
Correct
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According to the VSEPR model, which molecule is predicted to be linear?
Select one:
A. BF3
B. H2CO
C. H2S
D. HCN
E. SO3
Question 16
Correct
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A molecule with the formula AB3 and a trigonal planar molecular geometry uses
to form its σ bonds.
Select one:
A. sp3d2 hybrid orbitals
B. sp3d hybrid orbitals
C. sp hybrid orbitals
D. sp2 hybrid orbitals
E. sp3 hybrid orbitalsQuestion 20
Correct
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Which one of these salts will form an acidic solution upon dissolving in water?
Select one:
A. NaCN
B. NH4Br
C. KOH
D. LiBr
E. NaF
Question 19
Correct
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According to molecular orbital theory, what is the bond order in the O2+ ion?
Select one:
A. 2.5
B. 5.5
C. 4
D. 1.5
E. 5Question 22
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Which is the weakest acid?
Select one:
A. HBrO
B. HBrO4
C. HBrO3
D. HBrO2
E. HBr
Question 21
Correct
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Below is a representation of an aqueous solution of a weak acid HA at equilibrium. (Each
circle represents 1.0 × 10–3 mol of atoms, and the volume of the box is 1.0 L. Solvent
water molecules are not shown for clarity.)
What is the pH of the solution?
Select one:
A. 11.6
B. 11.0
C. 2.1
D. 3.0
E. 2.4Question 24
Correct
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A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of Ka for this
acid?
Select one:
A. 2.7 × 10–4
B. 7.2 × 101
C. 9.9 × 10–2
D. 1.4 × 10–3
E. 1.6 × 10–1
Question 25
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Find the pH of a 0.183 M aqueous solution of hypobromous acid (HOBr), for which
.
Select one:
A. 4.712
B. 0.738
C. 4.576
D. 8.686
E. 9.288
Question 23
Correct
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Which one of the following is a strong acid?
Select one:
A. H3PO4
B. CH3COOH
C. HClO3
D. NH3
E. H2SO3© 2023 StraighterLine. All rights reserved
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