Waec Model Questions Vol1 2018 Chemistry Question 3

Practice practical question 3 from the 2018 Waec Model Questions Vol1 Chemistry examination. This question covers Chemical Bonding .

Waec Model Questions Vol1 2018 Chemistry Practical

Topic: Chemical Bonding

Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • practical

A sample of an unknown metal oxide was analysed by heating in a crucible. The mass of the sample before heating was 1.456 g and after heating the mass of the residue (metal) was 1.018 g. The loss in mass is due to the removal of oxygen. Using the data provided, answer the following:

Question Parts

( a )

Calculate the mass of metal and the mass of oxygen that was lost on heating.

( b )

Determine the number of moles of metal and oxygen and deduce the empirical formula of the oxide. (Atomic weight of the metal is 55.85 g mol⁻¹.)

( c )

From the empirical formula, calculate the oxidation state of the metal in the oxide.

( d )

Based on the physical properties of the oxide (high melting point, insoluble in water, non‑conducting as a solid but conducts when molten), state the type of chemical bond present and give a brief justification.

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About This Question

This is Waec Model Questions Vol1 2018 Chemistry Question 3. It is a practical question from the 2018 Waec Model Questions Vol1 Chemistry examination.

The question covers Chemical Bonding .

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