Chemical equations — KCSE Chemistry

KCSE Chemistry · 59 practice questions · 4 syllabus objectives

26 easy22 medium11 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Write word equations and balanced symbol equations for chemical reactions

Include state symbols (s, l, g, aq) in chemical equations and explain their meaning

Interpret chemical equations in terms of moles, masses and volumes of reactants and products

Chemical equations

Sample Questions

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1
easySHORT ANSWER3 marks

Name the balanced chemical equation for the reaction between sodium bicarbonate and acetic acid, and identify the products formed. (3 marks)

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Part (a) — 2 marks
NaHCO₃(s) + CH₃COOH(aq) → CH₃COONa(aq) + H₂O(l) + CO₂(g) (2 mks)
Part (b) — 1 mark
Products: sodium acetate, water, and carbon dioxide (1 mk)
2
easySHORT ANSWER4 marks

Identify a word equation and write the corresponding balanced symbol equation for the reaction of iron(III) oxide with carbon to produce iron and carbon dioxide. (4 marks)

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Part (a) — 1 mark
Iron(III) oxide + Carbon → Iron + Carbon dioxide (1 mk)
Part (b) — 3 marks
2Fe₂O₃(s) + 3C(s) → 4Fe(s) + 3CO₂(g) (3 mks)
3
easySHORT ANSWER2 marks

Identify the balanced symbol equation for the reaction of sodium with water to produce sodium hydroxide and hydrogen gas. (2 marks)

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Part (a) — 2 marks
2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g) (2 mks)
4

State the meaning of the state symbols (s), (l), (aq), and (g) used in chemical equations. (4 marks)

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