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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 1 Quiz: First Transition Series, Electronic Configurations and Economic Significance

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  • Questions count: 20
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1.
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
50.0 mL of NaOH
10.0 mL of NaOH
2.
STEM Transition Elements Problem 26: 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
3.
STEM Chemistry Problem 22: 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
10.0 mL of NaOH
25.0 mL of NaOH
50.0 mL of NaOH
4.
STEM Transition Elements Problem 33: Why are most compounds of transition metals in the first series colored and paramagnetic?
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
Because of the total absence of electrons in the d-subshell
5.
STEM Organic Chemistry Problem 31: 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?
Acetic acid (Ethanoic acid) directly
Ethylene glycol through addition
Unstable vinyl alcohol intermediate that tautomerizes to Acetaldehyde (Ethanal, CH3CHO)
Ethyl alcohol (Ethanol) directly in one step
6.
STEM Analytical Chemistry Problem 44: 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
Thiosulfate anion producing SO2 and yellow sulfur precipitate
Sulfite anion (SO32−) producing sulfur dioxide gas (SO2)
Carbonate anion (CO32−) producing CO2
7.
STEM Chemistry Problem 25: 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
8.
STEM Analytical Chemistry Problem 36: 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
Carbonate anion (CO32−) producing CO2
Thiosulfate anion producing SO2 and yellow sulfur precipitate
9.
STEM Organic Chemistry Problem 5: 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?
Acetic acid (Ethanoic acid) directly
Ethyl alcohol (Ethanol) directly in one step
Unstable vinyl alcohol intermediate that tautomerizes to Acetaldehyde (Ethanal, CH3CHO)
Ethylene glycol through addition
10.
STEM Analytical Chemistry Problem 33: 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
Thiosulfate anion producing SO2 and yellow sulfur precipitate
Carbonate anion (CO32−) producing CO2
Sulfite anion (SO32−) producing sulfur dioxide gas (SO2)
11.
STEM Chemical Equilibrium Problem 8: 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
Adding a positive catalyst at constant volume
Removing nitrogen gas continuously from the chamber
Decreasing temperature and increasing total pressure
12.
STEM Organic Distinction Problem 28: 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 sodium metal: only ethanol reacts with sodium
Adding litmus paper: ethanol turns blue litmus red
Heating with concentrated sulfuric acid at 180°C
13.
STEM Chemical Equilibrium Problem 16: 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?
Removing nitrogen gas continuously from the chamber
Decreasing temperature and increasing total pressure
Increasing temperature and decreasing pressure
Adding a positive catalyst at constant volume
14.
STEM Faradaic Problem 7: 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
3.175 g of Cu
6.35 g of Cu
15.
STEM Chemical Equilibrium Problem 36: 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
16.
STEM Organic Chemistry Problem 32: 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
Ethyl alcohol (Ethanol) directly in one step
Ethylene glycol through addition
17.
STEM Organic Distinction Problem 22: 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
18.
STEM Analytical Chemistry Problem 30: 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
19.
STEM Organic Chemistry Problem 44: 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
Ethyl alcohol (Ethanol) directly in one step
Ethylene glycol through addition
20.
STEM Electrochemistry Problem 37: 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)?
+0.42 V
+1.10 V (spontaneous galvanic cell)
+0.58 V
-1.10 V (electrolytic cell)
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