Waec 2023 Chemistry Question 3

Practice essay / theory question 3 from the 2023 Waec Chemistry examination. This question covers General .

Waec 2023 Chemistry Essay / Theory

Topic: General

Question 3 WAEC • 2023 • CHEMISTRY • essay

A compound contains 52.2% C, 13.1% H and Oxygen only. The vapour density of the compound is 23.

Question Parts

( a )

(i) Determine its empirical formula; (ii) Determine its molecular formula; (iii) The compound reacts with sodium metal to produce hydrogen gas and when warmed with acidified KMnO₄ gives a solution which turns from purple to colourless. It also forms a sweet smelling liquid when heated with ethanoic acid in the presence of concentrated H₂SO₄. I. name the functional group present in the compound; II. draw the structural formula of the compound. [H=1.0, C=12.0, O=16.0]

( b )

Outline the chemical equations for the production of ethanol from cooked cassava.

( c )

(i) Explain briefly why a piece of aluminium does not react with water. (ii) How can a pure sample of aluminium chloride crystals be prepared from aluminium.

( d )

Describe how water can be separated from aqueous CuSO₄.

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About This Question

This is Waec 2023 Chemistry Question 3. It is one of the essay questions from the 2023 Waec Chemistry examination.

The question covers General .

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