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Chapter 1 - Transition Elements and Iron Metallurgy

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Chapter 3 - Chemical Equilibrium

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Lesson 1 Quiz: Introduction to Organic Chemistry, Wöhler’s Synthesis and Alkanes

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  • Questions count: 20
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1.
STEM Transition Elements Problem 9: 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
2.
STEM Organic Distinction Problem 19: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?
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
Adding litmus paper: ethanol turns blue litmus red
3.
STEM Organic Distinction Problem 41: 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
Heating with concentrated sulfuric acid at 180°C
Adding litmus paper: ethanol turns blue litmus red
Adding sodium metal: only ethanol reacts with sodium
4.
STEM Organic Distinction Problem 15: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?
Adding litmus paper: ethanol turns blue litmus red
Adding sodium metal: only ethanol reacts with sodium
Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change
Heating with concentrated sulfuric acid at 180°C
5.
STEM Faradaic Problem 5: 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
12.70 g of Cu
1.587 g of Cu
6.35 g of Cu
6.
STEM Organic Distinction Problem 18: 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 Analytical Chemistry Problem 21: 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
8.
STEM Chemical Equilibrium Problem 1: 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
Decreasing temperature and increasing total pressure
Removing nitrogen gas continuously from the chamber
Adding a positive catalyst at constant volume
9.
STEM Chemistry Problem 35: 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
50.0 mL of NaOH
25.0 mL of NaOH
10.
STEM Chemical Equilibrium Problem 42: 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
11.
STEM Electrochemistry Problem 44: 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
12.
STEM Transition Elements Problem 28: Why are most compounds of transition metals in the first series colored and paramagnetic?
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
Due to the presence of unpaired electrons in 3d orbitals that absorb specific wavelengths of visible light for d-d excitation
13.
STEM Faradaic Problem 30: 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
6.35 g of Cu
3.175 g of Cu
12.70 g of Cu
14.
STEM Organic Distinction Problem 38: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?
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
Adding litmus paper: ethanol turns blue litmus red
15.
STEM Organic Distinction Problem 9: 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
Heating with concentrated sulfuric acid at 180°C
Adding litmus paper: ethanol turns blue litmus red
Adding sodium metal: only ethanol reacts with sodium
16.
STEM Faradaic Problem 24: 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
17.
STEM Organic Distinction Problem 7: 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
Heating with concentrated sulfuric acid at 180°C
Adding litmus paper: ethanol turns blue litmus red
Adding sodium metal: only ethanol reacts with sodium
18.
STEM Electrochemistry Problem 36: 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
+0.58 V
+1.10 V (spontaneous galvanic cell)
-1.10 V (electrolytic cell)
19.
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)
3.175 g of Cu
1.587 g of Cu
6.35 g of Cu
12.70 g of Cu
20.
STEM Chemistry Problem 19: 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
50.0 mL of NaOH
12.5 mL of NaOH
10.0 mL of NaOH
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