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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 5 - Organic Chemistry

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Lesson 4 Quiz: Aromatic Hydrocarbons and Benzene Chemistry

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1.
STEM Faradaic Problem 32: 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
1.587 g of Cu
12.70 g of Cu
3.175 g of Cu
2.
STEM Chemical Equilibrium Problem 35: For the equilibrium reaction: N2(g) + 3 H2(g) 2 NH3(g) (ΔH = -92 kJ/mol), which change will shift the equilibrium to the right and increase ammonia yield?
Increasing temperature and decreasing pressure
Removing nitrogen gas continuously from the chamber
Adding a positive catalyst at constant volume
Decreasing temperature and increasing total pressure
3.
STEM Transition Elements Problem 27: 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
4.
STEM Chemical Equilibrium Problem 27: For the equilibrium reaction: N2(g) + 3 H2(g) 2 NH3(g) (ΔH = -92 kJ/mol), which change will shift the equilibrium to the right and increase ammonia yield?
Decreasing temperature and increasing total pressure
Adding a positive catalyst at constant volume
Removing nitrogen gas continuously from the chamber
Increasing temperature and decreasing pressure
5.
STEM Electrochemistry Problem 7: 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
6.
STEM Chemical Equilibrium Problem 4: For the equilibrium reaction: N2(g) + 3 H2(g) 2 NH3(g) (ΔH = -92 kJ/mol), which change will shift the equilibrium to the right and increase ammonia yield?
Adding a positive catalyst at constant volume
Increasing temperature and decreasing pressure
Decreasing temperature and increasing total pressure
Removing nitrogen gas continuously from the chamber
7.
STEM Analytical Chemistry Problem 1: 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
Sulfite anion (SO32−) producing sulfur dioxide gas (SO2)
Thiosulfate anion producing SO2 and yellow sulfur precipitate
Sulfide anion (S2−) producing H2S
8.
STEM Organic Distinction Problem 35: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?
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
Adding sodium metal: only ethanol reacts with sodium
9.
STEM Chemical Equilibrium Problem 9: For the equilibrium reaction: N2(g) + 3 H2(g) 2 NH3(g) (ΔH = -92 kJ/mol), which change will shift the equilibrium to the right and increase ammonia yield?
Decreasing temperature and increasing total pressure
Adding a positive catalyst at constant volume
Increasing temperature and decreasing pressure
Removing nitrogen gas continuously from the chamber
10.
STEM Faradaic Problem 27: 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
1.587 g of Cu
12.70 g of Cu
3.175 g of Cu
11.
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)
3.175 g of Cu
6.35 g of Cu
1.587 g of Cu
12.70 g of Cu
12.
STEM Analytical Chemistry Problem 18: 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
13.
STEM Transition Elements Problem 4: 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 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
14.
STEM Transition Elements Problem 20: 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
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
Due to nuclear fission within the metal atom
15.
STEM Electrochemistry Problem 16: 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 (electrolytic cell)
+0.58 V
+0.42 V
+1.10 V (spontaneous galvanic cell)
16.
STEM Chemistry Problem 21: 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?
10.0 mL of NaOH
25.0 mL of NaOH
50.0 mL of NaOH
12.5 mL of NaOH
17.
STEM Organic Distinction Problem 25: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?
Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change
Adding litmus paper: ethanol turns blue litmus red
Heating with concentrated sulfuric acid at 180°C
Adding sodium metal: only ethanol reacts with sodium
18.
STEM Chemical Equilibrium Problem 34: For the equilibrium reaction: N2(g) + 3 H2(g) 2 NH3(g) (ΔH = -92 kJ/mol), which change will shift the equilibrium to the right and increase ammonia yield?
Increasing temperature and decreasing pressure
Removing nitrogen gas continuously from the chamber
Decreasing temperature and increasing total pressure
Adding a positive catalyst at constant volume
19.
STEM Chemistry Problem 34: 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
10.0 mL of NaOH
12.5 mL of NaOH
50.0 mL of NaOH
20.
STEM Analytical Chemistry Problem 4: 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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