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Chapter 1 - Transition Elements and Iron Metallurgy

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Chapter 2 - Chemical Analysis

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Chapter 3 - Chemical Equilibrium

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Chapter 4 - Electrochemistry

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Chapter 5 - Organic Chemistry

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Lesson 3 Quiz: Iron Ore Extraction, Reduction Furnaces and Alloy Classifications

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1.
STEM Analytical Chemistry Problem 12: When dilute hydrochloric acid (HCl) is added to a solid unknown salt, a colorless gas evolves that turns paper moistened with acidified potassium dichromate from orange to green. What is the anion?
Sulfite anion (SO32−) producing sulfur dioxide gas (SO2)
Sulfide anion (S2−) producing H2S
Thiosulfate anion producing SO2 and yellow sulfur precipitate
Carbonate anion (CO32−) producing CO2
2.
STEM Organic Chemistry Problem 33: Catalytic hydration of acetylene (ethyne, C2H2) with H2O in the presence of 40% H2SO4 and 1% HgSO4 at 60°C yields which intermediate and final product?
Unstable vinyl alcohol intermediate that tautomerizes to Acetaldehyde (Ethanal, CH3CHO)
Ethylene glycol through addition
Acetic acid (Ethanoic acid) directly
Ethyl alcohol (Ethanol) directly in one step
3.
STEM Faradaic Problem 26: What mass of copper (atomic mass = 63.5 g/mol) is deposited at the cathode when a constant current of 9.65 A passes through a CuSO4 solution for 1,000 seconds? (Faraday constant = 96,500 C/mol)
1.587 g of Cu
12.70 g of Cu
6.35 g of Cu
3.175 g of Cu
4.
STEM Transition Elements Problem 4: Why are most compounds of transition metals in the first series colored and paramagnetic?
Because of the total absence of electrons in the d-subshell
Due to nuclear fission within the metal atom
Because they possess completely filled 3d10 orbitals
Due to the presence of unpaired electrons in 3d orbitals that absorb specific wavelengths of visible light for d-d excitation
5.
STEM Analytical Chemistry Problem 24: When dilute hydrochloric acid (HCl) is added to a solid unknown salt, a colorless gas evolves that turns paper moistened with acidified potassium dichromate from orange to green. What is the anion?
Sulfite anion (SO32−) producing sulfur dioxide gas (SO2)
Thiosulfate anion producing SO2 and yellow sulfur precipitate
Sulfide anion (S2−) producing H2S
Carbonate anion (CO32−) producing CO2
6.
STEM Organic Distinction Problem 4: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?
Adding sodium metal: only ethanol reacts with sodium
Adding litmus paper: ethanol turns blue litmus red
Heating with concentrated sulfuric acid at 180°C
Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change
7.
STEM Transition Elements Problem 36: Why are most compounds of transition metals in the first series colored and paramagnetic?
Due to the presence of unpaired electrons in 3d orbitals that absorb specific wavelengths of visible light for d-d excitation
Because they possess completely filled 3d10 orbitals
Because of the total absence of electrons in the d-subshell
Due to nuclear fission within the metal atom
8.
STEM Organic Chemistry Problem 6: Catalytic hydration of acetylene (ethyne, C2H2) with H2O in the presence of 40% H2SO4 and 1% HgSO4 at 60°C yields which intermediate and final product?
Ethyl alcohol (Ethanol) directly in one step
Ethylene glycol through addition
Acetic acid (Ethanoic acid) directly
Unstable vinyl alcohol intermediate that tautomerizes to Acetaldehyde (Ethanal, CH3CHO)
9.
STEM Transition Elements Problem 1: Why are most compounds of transition metals in the first series colored and paramagnetic?
Due to the presence of unpaired electrons in 3d orbitals that absorb specific wavelengths of visible light for d-d excitation
Due to nuclear fission within the metal atom
Because of the total absence of electrons in the d-subshell
Because they possess completely filled 3d10 orbitals
10.
STEM Faradaic Problem 11: What mass of copper (atomic mass = 63.5 g/mol) is deposited at the cathode when a constant current of 9.65 A passes through a CuSO4 solution for 1,000 seconds? (Faraday constant = 96,500 C/mol)
6.35 g of Cu
12.70 g of Cu
3.175 g of Cu
1.587 g of Cu
11.
STEM Organic Chemistry Problem 15: Catalytic hydration of acetylene (ethyne, C2H2) with H2O in the presence of 40% H2SO4 and 1% HgSO4 at 60°C yields which intermediate and final product?
Unstable vinyl alcohol intermediate that tautomerizes to Acetaldehyde (Ethanal, CH3CHO)
Acetic acid (Ethanoic acid) directly
Ethylene glycol through addition
Ethyl alcohol (Ethanol) directly in one step
12.
STEM Chemistry Problem 31: A 25.0 mL sample of 0.10 M H2SO4 is completely neutralized by 0.20 M NaOH. What volume of NaOH solution is required to reach the equivalence point?
25.0 mL of NaOH
12.5 mL of NaOH
10.0 mL of NaOH
50.0 mL of NaOH
13.
STEM Chemistry Problem 42: A 25.0 mL sample of 0.10 M H2SO4 is completely neutralized by 0.20 M NaOH. What volume of NaOH solution is required to reach the equivalence point?
25.0 mL of NaOH
12.5 mL of NaOH
10.0 mL of NaOH
50.0 mL of NaOH
14.
STEM Transition Elements Problem 19: Why are most compounds of transition metals in the first series colored and paramagnetic?
Due to the presence of unpaired electrons in 3d orbitals that absorb specific wavelengths of visible light for d-d excitation
Because they possess completely filled 3d10 orbitals
Because of the total absence of electrons in the d-subshell
Due to nuclear fission within the metal atom
15.
STEM Chemistry Problem 27: A 25.0 mL sample of 0.10 M H2SO4 is completely neutralized by 0.20 M NaOH. What volume of NaOH solution is required to reach the equivalence point?
50.0 mL of NaOH
25.0 mL of NaOH
10.0 mL of NaOH
12.5 mL of NaOH
16.
STEM Electrochemistry Problem 2: In a Daniell cell, Zn | Zn2+ (1 M) || Cu2+ (1 M) | Cu, given E°(Zn2+/Zn) = -0.76 V and E°(Cu2+/Cu) = +0.34 V, what is the standard electromotive force (E°cell)?
+0.58 V
+1.10 V (spontaneous galvanic cell)
+0.42 V
-1.10 V (electrolytic cell)
17.
STEM Analytical Chemistry Problem 8: When dilute hydrochloric acid (HCl) is added to a solid unknown salt, a colorless gas evolves that turns paper moistened with acidified potassium dichromate from orange to green. What is the anion?
Carbonate anion (CO32−) producing CO2
Thiosulfate anion producing SO2 and yellow sulfur precipitate
Sulfide anion (S2−) producing H2S
Sulfite anion (SO32−) producing sulfur dioxide gas (SO2)
18.
STEM Electrochemistry Problem 18: In a Daniell cell, Zn | Zn2+ (1 M) || Cu2+ (1 M) | Cu, given E°(Zn2+/Zn) = -0.76 V and E°(Cu2+/Cu) = +0.34 V, what is the standard electromotive force (E°cell)?
+1.10 V (spontaneous galvanic cell)
-1.10 V (electrolytic cell)
+0.42 V
+0.58 V
19.
STEM Chemistry Problem 43: A 25.0 mL sample of 0.10 M H2SO4 is completely neutralized by 0.20 M NaOH. What volume of NaOH solution is required to reach the equivalence point?
12.5 mL of NaOH
50.0 mL of NaOH
25.0 mL of NaOH
10.0 mL of NaOH
20.
STEM Analytical Chemistry Problem 37: When dilute hydrochloric acid (HCl) is added to a solid unknown salt, a colorless gas evolves that turns paper moistened with acidified potassium dichromate from orange to green. What is the anion?
Sulfide anion (S2−) producing H2S
Carbonate anion (CO32−) producing CO2
Sulfite anion (SO32−) producing sulfur dioxide gas (SO2)
Thiosulfate anion producing SO2 and yellow sulfur precipitate
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