Exam Body

Year

Subject

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WAEC 2024 Chemistry | Essay

Prepare for your exams with WAEC questions? Reviewing past/model questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Essay) questions designed to simulate the real exam environment.

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Question 1 View Details

Question Parts

(a)

What is an electrochemical cell?

(b)

State three differences between an electrochemical cell and an electrolytic cell.

(c)

Explain briefly what would be observed when powdered zinc is added to a solution of copper (II) tetraoxosulphate (IV) in a beaker.

(e)

Name two gases which should be prepared in a fume chamber.

(f)

Give three factors that favour cracking.

(g)

Give the reason why noble gases are chemically inert.

(h)

State four properties of a homologous series.

(i)

What is global warming?

(j)

State one cause of global warming.

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Question 2 View Details

Question Parts

(a)

(i) Define each of the following terms; I. Deliquescence; II. efflorescence

(a)

(ii) Give one example of a substance that undergoes each of the processes in 2a(I)

(b)

(i) What is meant by ionization energy?

(b)

(ii) The second ionization energy value of sodium is greater than the first ionization energy. Briefly give an explanation for this observation.

(c)

(i) State Charle's law

(c)

(ii) Sketch a graph to illustrate Charles' law.

(c)

(iii) A gas occupies \( 150 \mathrm{~cm}^{3} \) at 21 °C. What would be its volume if the temperature is raised to \( 45{ }^{\circ} \mathrm{C} \) and the pressure is kept constant?

(d)

(i) Write chemical equations to illustrate what happens when each of the following oxides is dissolved in water: (I) sodium oxide; (II) phosphorus (III) oxide; (III) chlorine (VII) oxide; (IV) magnesium oxide.

(d)

(ii) Arrange the solutions in 2d(i) in order of increasing acidity.

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Question 3 View Details

Question Parts

(a)

(i) Write balanced chemical equations for the production of lead (II) chloride by: I. direct combination of constituent elements; II. double decomposition; III. displacement reaction.

(a)

(ii) State conditions that would increase the rate of reaction for each of the reactions stated in 3a(i).

(b)

Consider the following reaction equation: \( \mathrm{SSO}_{3(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{SO}_{3(\mathrm{~g})} ; \Delta \mathrm{H}= \) positive

(c)

Using structural diagrams, explain why cyclopropane is not an isomer of \( n \)-propane.

(d)

A saturated organic compound X containing three carbon atoms reacted with butanoic acid in the presence of dilute \( \mathrm{H}_{2} \mathrm{SO}_{4}^{-} \) to form a sweet smelling compound \( \mathbf{Y} \).

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Question 4 View Details

Question Parts

(a)

(i) Write a balanced chemical equation for each of the following reactions: (i) ammonia gas with copper (II) oxide; (ii) ammonia gas with oxygen gas; (iii) aqueous potassium iodide with chlorine gas; (iv) iron with dilute tetraoxosulphate (VI) acid; (v) aqueous lead (II) trioxonitrate (V) with hydrogen chloride gas.

(b)

(i) Describe briefly the process involved in the extraction of tin from tin ore.

(b)

(ii) Mention three uses of hydrogen.

(b)

(iii) State two physical properties of hydrogen.

(b)

State the class of oxide to which each of the following compounds belong; (i) \( \mathrm{Na}_{2} \mathrm{O} \); (ii) ZnO ; (iii) \( \mathrm{SO}_{2} \); (iv) \( \mathrm{CO}_{2} \); (v) \( \mathrm{N}_{2} \mathrm{O} \).