Grade 10 Physical Sciences · Chemical Change · Paper 2 (Chemistry)

Representing Chemical Change Grade 10

Real Representing Chemical Change past paper questions and answers from 2018 to 2026, with each memo split into the ticks examiners give. Try one, mark yourself, and see exactly which skill cost you marks.

past paper questions: 82 past paper questions
skills: 5 skills
videos: 5 videos

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Question 4.5 · May/June 2025 · Paper 2 · National (DBE) · 3 marks

In the flow diagram below, a primary alcohol P is used as a starting reactant to form different organic compounds under different reaction conditions. Diagram for this question

4.5 Write down a balanced equation using MOLECULAR FORMULAE for the complete combustion of butane.(3)

Work it out on paper first. Then mark yourself with the official memo, one tick at a time.

Representing Chemical Change skills

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More Representing Chemical Change Grade 10 questions and answers

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4. Question 4.1.3 · November 2023 · Paper 2 · National (DBE) · 3 marks
4.1 Consider the cracking reaction below.

$C_{16} H_{34} \to C_{6} H_{14} + C_{6} H_{x} + 2 C_{y} H_{z}$
Compound $C_{6} H_{14}$ undergoes complete combustion.
4.1.3 Using MOLECULAR FORMULAE, write down the balanced equation for this reaction.(3)
Show the memo (3 ticks)Memo
1. ✓
  Reactant: $O_{2}$ $2 C_{6} H_{14} + 19 O_{2}$
  1 mark · Write a chemical equation
2. ✓
  Products $\to 12 CO_{2} + 14 H_{2} O$
  1 mark · Write a chemical equation
3. ✓
  Balancing $2 C_{6} H_{14} + 19 O_{2} \to 12 CO_{2} + 14 H_{2} O$
  1 mark · Balance a chemical equation
5. Question 2.4.2 · May/June 2022 · Paper 2 · National (DBE) · 3 marks
The letters A to H in the table below represent eight organic compounds.
2.4 For compound G, write down:
2.4.2 A balanced equation, using molecular formulae, for its complete combustion(3)
Show the memo (3 ticks)Memo
1. ✓
  Reactants $2 C_{4} H_{10} + 13 O_{2}$
  1 mark · Write a chemical equation
2. ✓
  Products $\to 8 CO_{2} + 10 H_{2} O$
  1 mark · Write a chemical equation
3. ✓
  Balancing $2 C_{4} H_{10} + 13 O_{2} \to 8 CO_{2} + 10 H_{2} O$
  1 mark · Balance a chemical equation
6. Question 4.4.1 · November 2019 · Paper 2 · National (DBE) · 2 marks
A section of the periodic table is shown below. Imaginary symbols are used to represent some of the elements.
4.4 Write down the formula of the compound formed when:
4.4.1 D combines with G(2)
Show the memo (1 tick)Memo
1. ✓
  Formula $D_{2} G_{3}$ (accept $Al_{2} O_{3}$ )
  2 marks · Write names and formulae of compounds
7. Question 5.5.2 · November 2018 · Paper 2 · National (DBE) · 4 marks
Study the physical and chemical processes below and answer the questions that follow.

X: $H_{2} O(s) \to H_{2} O(g)$

Y: $CaCO_{3} (s) Δ CaO(s) + CO_{2} (g)$

Z: Iron + Oxygen $\to$ Iron(III) oxide
5.5 For process Z, write down:
5.5.2 A BALANCED CHEMICAL EQUATION (Show the phases of ALL reactants and products.)(4)
Show the memo (4 ticks)Memo
1. ✓
  Reactants $4 Fe(s) + 3 O_{2} (g)$
  1 mark · Write a chemical equation
2. ✓
  Products $\to 2 Fe_{2} O_{3} (s)$
  1 mark · Write a chemical equation
3. ✓
  PhasesFe(s), $O_{2}$ (g), $Fe_{2} O_{3}$ (s)
  1 mark · Write a chemical equation
4. ✓
  Balancing $4 Fe(s) + 3 O_{2} (g) \to 2 Fe_{2} O_{3} (s)$
  1 mark · Balance a chemical equation
8. Question 2.6 · September 2026 · Paper 2 · Provincial · 3 marks
The table below shows organic molecules (A–D) from different homologous series.
2.6 Compound A undergoes complete combustion. Write down the balanced equation for this reaction by using MOLECULAR FORMULAE.(3)
Show the memo (3 ticks)Memo
1. ✓
  Reactants $2 C_{6} H_{14} + 19 O_{2}$
  1 mark · Write a chemical equation
2. ✓
  Products $\to 12 CO_{2} + 14 H_{2} O$
  1 mark · Write a chemical equation
3. ✓
  Balancing $2 C_{6} H_{14} + 19 O_{2} \to 12 CO_{2} + 14 H_{2} O$
  1 mark · Balance a chemical equation
9. Question 4.2.3 · September 2026 · Paper 2 · Provincial · 3 marks
A primary, a secondary and a tertiary alcohol are used in three different reactions. The flow diagram below represents these reactions.
4.2 For REACTION II: ( $C_{5} H_{12} O$ secondary alcohol)
4.2.3 Use molecular formulae to write down the balanced combustion reaction of compound C in sufficient oxygen.(3)
Show the memo (3 ticks)Memo
1. ✓
  Reactants $C_{5} H_{12} + O_{2}$
  1 mark · Write a chemical equation
2. ✓
  Products $\to CO_{2} + H_{2} O$
  1 mark · Write a chemical equation
3. ✓
  Balancing $C_{5} H_{12} + 8 O_{2} \to 5 CO_{2} + 6 H_{2} O$
  1 mark · Balance a chemical equation
10. Question 4.2.2 · September 2026 · Paper 2 · Provincial · 3 marks
Study the flow diagram below and answer the questions that follow.
4.2 Consider reaction III.
4.2.2 Using MOLECULAR FORMULAE, write down the balanced equation for the reaction.(3)
Show the memo (3 ticks)Memo
1. ✓
  Reactants $C_{4} H_{10} + O_{2}$
  1 mark · Write a chemical equation
2. ✓
  Products $\to CO_{2} + H_{2} O$
  1 mark · Write a chemical equation
3. ✓
  Balancing $2 C_{4} H_{10} + 13 O_{2} \to 8 CO_{2} + 10 H_{2} O$
  1 mark · Balance a chemical equation

Representing Chemical Change Grade 10 videos

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