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• CHEM101_MH_V4
• Topic 6: Quantum Theory
Started on Friday, April 15, 2022, 7:28 PM
State Finished
Completed on Friday, April 15,
... [Show More] 2022, 7:50 PM
Time taken 21 mins 36 secs
Grade 115.00 out of 115.00 (100%)
Question 1
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A 0.8838-g sample of an ionic compound containing bromide ions and an unknown metal cation is dissolved in water and treated with an excess of AgNO3. If 1.573 g of a AgBr precipitate forms, what is the percent by mass of Br in the original compound?
Select one:
a. 62.13%
b. 75.72%
c. 56.19%
d. 42.55%
e. 37.87%
Question 2
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Based on the solubility rules, which one of these compounds is soluble in water?
Select one:
a. CaSO4
b. BaSO4
c. PbSO4
d. K2SO4
e. Ag2SO4
Question 3
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Which of the following is a weak acid?
Select one:
a. H2SO4
b. HNO3
c. HF
d. HBr
e. HCl
Question 4
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Which is a strong acid?
Select one:
a. Ba(OH)2
b. H3PO4
c. HC2H3O2
d. NaCl
e. HClO4
Question 5
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What is the oxidizing agent in the following reaction?
5Fe2+(aq) + MnO4–(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)
Select one:
a. Fe2+
b. MnO4–
c. H+
d. Mn2+
e. Fe3+
Question 6
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Which is a correct description of the following reaction? H2SO4 + Cd(OH)2 → 2H2O + CdSO4
Select one:
a. This reaction is an acid-base reaction.
b. In this reaction, hydrogen is oxidized.
c. In this reaction, sulfur is oxidized.
d. In this reaction, cadmium is oxidized.
e. In this reaction, oxygen is oxidized.
Question 7
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Balance the following oxidation-reduction equation:
Li(s) + O2(g) → Li2O(s)
Select one:
a. 2Li(s) + O2(g) → Li2O(s)
b. Li(s) + O2(g) → Li2O(s)
c. 4Li(s) + O2(g) → 2Li2O(s)
d. 2Li(s) + O2(g) → 2Li2O(s)
e. 2Li(s) + O2(g) → 4Li2O(s)
Question 8
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What is the reducing agent in the following reaction?
5Fe2+(aq) + MnO4–(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)
Select one:
a. Fe2+
b. MnO4–
c. H+
d. Mn2+
e. Fe3+
Question 9
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For the reaction depicted below, if Z represents Zn, which metal could A represent?
Select one:
a. Fe
b. Co
c. Pb
d. Ca
e. Cu
Question 10
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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 ΔH°f(kJ/mol)
CO(g) –110.5
Al2O3(s) –1669.8
Select one:
a. 310.0 kJ
b. 386.8 kJ
c. 412.4 kJ
d. 773.6 kJ
e. 824.8 kJ
Question 11
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How much heat is required to raise the temperature of 22.8 g of copper from 20.0°C to 875.0°C? The specific heat of copper is 0.385 J/g·°C.
Select one:
a. 14.4 J
b. 176 J
c. 7.51 kJ
d. 7.68 kJ
e. 9.90 kJ
Question 12
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Ethylene glycol, used as a coolant in automotive engines, has a specific heat capacity of 2.42 J/g°C. Calculate q when 3.65 kg of ethylene glycol is cooled from 132°C to 85°C.
Select one:
a. –1900 kJ
b. –420 kJ
c. –99 kJ
d. –0.42 kJ
e. –4.2 × 10–6 kJ
Question 13
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Which equation has a ΔHrxn that is not equal to ΔHof of the product?
Select one:
a. O2(g) + H2(g) → H2O2(g)
b. ½O2(g) + H2(g) → H2O(g)
c. H2(g) + ½O2(g) + → H2O(l)
d. NO(g) + ½O2(g) → NO2(l)
e. ½H2(g) + ½Cl2(g) → HCl(g)
Question 14
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An exothermic reaction causes the surroundings to
Select one:
a. warm up.
b. become acidic.
c. expand.
d. decrease its temperature.
e. release CO2.
Question 15
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Which represents an enthalpy change at 25 °C and 1 atm that is equal to ΔHof for H2O(l)?
Select one:
a. O2(g) + 2H2(g) → 2H2O(l)
b. ½O2(g) + H (g) → H2O(g)
c. H2(g) + ½O2(g) → H2O(l)
d. 2H2O(l) → O2(g) + 2H2(g)
e. H2O(l) → ½O2(g) + H2(g)
Question 16
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An ideal gas (the system) is contained in a flexible balloon at a pressure of 1 atm and is initially at a temperature of 20.°C. The surrounding air is at the same pressure, but its temperature is 25°C. When the system has equilibrated with its surroundings, both system and surroundings are at 25°C and 1 atm. In changing from the initial to the final state, which one of the following relationships regarding the system is correct?
Select one:
a. ΔU < 0
b. ΔU = 0
c. ΔH = 0
d. w > 0
e. q > 0
Question 17
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How much heat is released if 7.15 g CaO(s) is added to 152 g of H2O(l)?
CaO(s) + H2O(l) → Ca(OH)2(s) ΔH°rxn = –64.8 kJ/mol
Select one:
a. 7.68 kJ
b. 8.26 kJ
c. 508 kJ
d. 547 kJ
e. 555 kJ
Question 18
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The solar radiation spectrum peaks at a wavelength of approximately 500 nm. Calculate the energy of one photon of that radiation (c = 3.00 × 108 m/s; h = 6.63 × 10–34 J • s).
Select one:
a. 4 × 10–10 J
b. 6 × 1014 J
c. 1 × 10–27 J
d. 2 × 10–25 J
e. 4 × 10–19 J
Question 19
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Which element has the following ground-state electron configuration?
[Kr]5s24d105p2
Select one:
a. Sn
b. Sb
c. Pb
d. Ge
e. Te
Question 20
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The unusual electron configuration of Mo indicates the
Select one:
a. unusual stability of half-filled d-orbitals.
b. unpredictability of the electron filling patterns of the non-representative elements.
c. unusually large size of Mo atoms.
d. greater than expected electronegativity of Mo.
Question 21
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Select the arrangement of electromagnetic radiation which starts with the shortest wavelength and increases to longest wavelength.
Select one:
a. radio, infrared, ultraviolet, gamma rays
b. radio, ultraviolet, infrared, gamma rays
c. gamma rays, radio, ultraviolet, infrared
d. gamma rays, infrared, radio, ultraviolet
e. gamma rays, ultraviolet, infrared, radio
Question 22
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Which ground-state atom has an electron configuration described by the following orbital diagram?
[Ar] ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿ ↿
4s 3d 4p
Select one:
a. phosphorus
b. germanium
c. selenium
d. tellurium
e. potassium
Question 23
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Which element has the following ground-state electron configuration?
1s2 2s2 2p6 3s2
Select one:
a. Na
b. Mg
c. Al
d. Si
e. Ne
Question 24
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The FM station KDUL broadcasts music at 99.1 MHz. Find the wavelength of these waves. (c = 3.00 × 108 m/s)
Select one:
a. 1.88 × 10–2 m
b. 0.330 m
c. 3.03 m
d. 5.33 × 102 m
e. > 103 m
Question 25
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Which scientist proposed that energy of radiation is composed of extremely small indivisible packages called quanta? (“Quanta” is the plural of “quantum.”)
Select one:
a. Max Planck
b. Louis de Broglie
c. Clinton Davisson
d. Sir Isaac Newton
e. Lothan Meyer [Show Less]