Neco Model Questions Vol1 2025 Chemistry Question 3

Practice essay / theory question 3 from the 2025 Neco Model Questions Vol1 Chemistry examination. This question covers Chemical Bonding .

Neco Model Questions Vol1 2025 Chemistry Essay / Theory

Topic: Chemical Bonding

Question 3 NECO_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

A sample of an unknown solid compound X is a white crystalline material with a high melting point (≈ 800 °C). It dissolves readily in water to give a colourless solution that conducts electricity. On evaporating the solution, colourless crystals of X reappear. Spectroscopic analysis shows that X contains only sodium (Na), chlorine (Cl) and oxygen (O) atoms.

Question Parts

( a )

Identify the predominant type of chemical bonding present in X and justify your choice using the observations given.

( b )

A 100 g sample of X was analysed and found to contain 23.0 g Na, 35.5 g Cl and 48.0 g O. Determine the empirical formula of X, showing all steps of your calculation.

( c )

Discuss how the nature of the bonding you identified in part (a) influences each of the following physical properties of X: (i) its high melting point, (ii) its solubility in water, and (iii) the electrical conductivity of its aqueous solution.

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About This Question

This is Neco Model Questions Vol1 2025 Chemistry Question 3. It is one of the essay questions from the 2025 Neco Model Questions Vol1 Chemistry examination.

The question covers Chemical Bonding .

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