Neco Model Questions Vol1 2017 Chemistry Question 3

Practice essay / theory question 3 from the 2017 Neco Model Questions Vol1 Chemistry examination. This question covers Chemical Bonding .

Neco Model Questions Vol1 2017 Chemistry Essay / Theory
Topic: Chemical Bonding
Question 3 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • essay

Magnesium chloride (MgCl₂) is a typical inorganic compound formed between a metal and a non‑metal. The electronegativity values are: Mg = 1.31, Cl = 3.16. Answer the following questions.

Question Parts

( a )
State the type of bond present in MgCl₂ and justify your answer using the given electronegativity values. Explain why MgCl₂ forms a crystal lattice rather than discrete molecules.
( b )
Draw the Lewis dot diagram for the carbonate ion (CO₃²⁻). Indicate the resonance structures and explain the concept of resonance as it applies to this ion.
( c )
Using Pauling’s empirical formula, estimate the percent ionic character of the Mg–Cl bond. Pauling’s formula: % ionic character = \(\left(1- e^{-0.25(Δχ)^2}\right)\times100\) where \(Δχ\) is the electronegativity difference.
( d )
Compare qualitatively the lattice energy of MgCl₂ with that of NaCl and CaO. Discuss how the ionic charges and ionic radii influence the magnitude of lattice energy.

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About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 3. It is one of the essay questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

The question covers Chemical Bonding .

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