Waec Model Questions Vol1 2024 Chemistry Question 3

Practice essay / theory question 3 from the 2024 Waec Model Questions Vol1 Chemistry examination. This question covers Chemical Bonding .

Waec Model Questions Vol1 2024 Chemistry Essay / Theory
Topic: Chemical Bonding
Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • essay

A compound AB is formed between element A (electronegativity 2.1) and element B (electronegativity 3.5). The measured lattice energy of the solid AB is 750 kJ mol⁻¹. The compound is soluble in water and conducts electricity when molten.

Question Parts

( a )
State the type of chemical bond present in AB and justify your answer using the given electronegativity difference and lattice energy.
( b )
Calculate the percent ionic character of the A–B bond using the formula % ionic = (1 – e^{‑0.25(Δχ)²}) × 100, where Δχ is the electronegativity difference.
( c )
Explain why AB conducts electricity when molten but does not conduct in the solid state.

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About This Question

This is Waec Model Questions Vol1 2024 Chemistry Question 3. It is one of the essay questions from the 2024 Waec Model Questions Vol1 Chemistry examination.

The question covers Chemical Bonding .

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