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

Question 1

Why is Zinc (30Zn) not considered a transition element according to ministerial IUPAC definition?

Accepted Answer

Its 3d sublevel is completely filled in both atomic state and +2 oxidation state

Answer

It does not conduct electricity

Answer

It only has one radioactive isotope

Answer

It forms colored ionic complexes in aqueous solutions

Question 2

Which transition element compound is utilized as a catalyst in the manufacture of sulfuric acid via the Contact Process?

Accepted Answer

Vanadium(V) oxide (V2O5)

Answer

Titanium dioxide (TiO2)

Answer

Potassium permanganate (KMnO4)

Answer

Iron(III) oxide (Fe2O3)

Question 3

What is the exact chemical deduction according to Egyptian curriculum standards for: Electronic Configuration of the First Transition Series?

Accepted Answer

Chromium (Cr: 24) has an anomalous configuration [Ar] 4s1 3d5 to achieve half-filled d-subshell stability, and Copper (Cu: 29) is [Ar] 4s1 3d10 for completely filled d-subshell stability

Answer

Both Chromium and Copper have fully filled 4s2 orbitals

Answer

Scandium (Sc: 21) exhibits stable oxidation states of +1, +2, and +3

Answer

Zinc (Zn: 30) is considered a typical transition element in all its compounds

Question 4

What is the exact chemical deduction according to Egyptian curriculum standards for: Le Chatelier's Principle in Gas-Phase Equilibrium?

Accepted Answer

Increasing pressure on an equilibrium mixture shifts the reaction toward the side with fewer moles of gas, without changing the equilibrium constant (Kc)

Answer

Increasing temperature always increases the value of Kc for exothermic reactions

Answer

Adding a catalyst shifts the equilibrium position toward products

Answer

Decreasing volume increases the value of Kp for any reaction

Question 5

What is the exact chemical deduction according to Egyptian curriculum standards for: Standard Hydrogen Electrode (SHE) and Galvanic Cells?

Accepted Answer

SHE has an arbitrarily defined standard potential E° = 0.00 V under standard conditions (1 atm H2 gas, 1.0 M H+ solution, 298 K)

Answer

SHE potential changes to 1.00 V when connected to Zinc

Answer

The standard hydrogen electrode uses pure copper wire without platinum black

Answer

SHE can only act as an anode and never as a cathode

Question 6

What is the exact chemical deduction according to Egyptian curriculum standards for: Markovnikov's Rule in Electrophilic Addition to Alkenes?

Accepted Answer

When an asymmetric reagent (HX) adds to an asymmetric alkene, the positive hydrogen ion attaches to the double-bonded carbon with more hydrogen atoms, while the halide adds to the more substituted carbon

Answer

Hydrogen always attaches to the carbon with fewer hydrogen atoms

Answer

Markovnikov's rule applies exclusively to symmetrical alkynes like ethyne

Answer

Addition occurs with the halogen attaching to the terminal methyl group

Question 7

STEM Chemistry Problem 1: 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?

Accepted Answer

25.0 mL of NaOH

Answer

50.0 mL of NaOH

Answer

12.5 mL of NaOH

Answer

10.0 mL of NaOH

Question 8

STEM Electrochemistry Problem 1: 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)?

Accepted Answer

+1.10 V (spontaneous galvanic cell)

Answer

+0.42 V

Answer

-1.10 V (electrolytic cell)

Answer

+0.58 V

Question 9

STEM Faradaic Problem 1: 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)

Accepted Answer

3.175 g of Cu

Answer

6.35 g of Cu

Answer

1.587 g of Cu

Answer

12.70 g of Cu

Question 10

STEM Organic Chemistry Problem 1: 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?

Accepted Answer

Unstable vinyl alcohol intermediate that tautomerizes to Acetaldehyde (Ethanal, CH3CHO)

Answer

Ethyl alcohol (Ethanol) directly in one step

Answer

Acetic acid (Ethanoic acid) directly

Answer

Ethylene glycol through addition

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