Waec Model Questions Vol1 2020 Chemistry Question 3

Practice essay / theory question 3 from the 2020 Waec Model Questions Vol1 Chemistry examination. This question covers Ionic bonding, Covalent bonding, Molecular geometry, Hybridisation, Lattice energy .

Waec Model Questions Vol1 2020 Chemistry Essay / Theory
Topics: Ionic bonding Covalent bonding Molecular geometry Hybridisation Lattice energy
Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • essay

Consider the statements and data given below about chemical bonding:

Question Parts

( a )
Explain, with appropriate reasoning, why sodium chloride (NaCl) forms an ionic bond rather than a covalent bond.
( b )
Ammonia (NH₃) is a covalent molecule. State the type of covalent bond present, describe its molecular geometry and hybridisation, and predict whether the molecule is polar or non‑polar, giving reasons.
( c )
The lattice energy of magnesium oxide (MgO) is 3790 kJ mol⁻¹, whereas that of sodium chloride (NaCl) is 787 kJ mol⁻¹. Using the concepts of ionic charge and ionic radii, explain the large difference in their lattice energies.

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About This Question

This is Waec Model Questions Vol1 2020 Chemistry Question 3. It is one of the essay questions from the 2020 Waec Model Questions Vol1 Chemistry examination.

The question covers Ionic bonding, Covalent bonding, Molecular geometry, Hybridisation, Lattice energy .

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