CHEMISTRY - CHEMICAL EQUATIONS

Balancing Equations Worksheet

  • 10 questions
  • Difficulty: Hard
  • Board: CAIE
  • Attempt online on the examination portal

Here are the first 3 questions. Click “View all questions” to see the complete assessment.

Q1.

When FeS₂ + O₂ → Fe₂O₃ + SO₂ is balanced using the smallest whole-number coefficients, what is the coefficient of O₂?

  1. A) 7
  2. B) 13
  3. C) 11
  4. D) 9

Q2.

Which sequence gives the smallest whole-number coefficients for Fe(NO₃)₃ → Fe₂O₃ + NO₂ + O₂, in the order shown?

  1. A) 6, 3, 18, 4
  2. B) 4, 2, 12, 3
  3. C) 2, 1, 6, 3
  4. D) 4, 2, 6, 6

Q3.

Aluminium reacts with sulfuric acid according to Al + H₂SO₄ → Al₂(SO₄)₃ + H₂. After balancing with the smallest whole-number coefficients, what is the coefficient of H₂?

  1. A) 2
  2. B) 4
  3. C) 6
  4. D) 3

Q4.

Ammonia is oxidised according to NH₃ + O₂ → NO + H₂O. What is the coefficient ratio O₂ : H₂O when the equation is balanced using the smallest whole numbers?

  1. A) 4 : 5
  2. B) 3 : 4
  3. C) 6 : 5
  4. D) 5 : 6

Q5.

Balance P₄ + KOH + H₂O → PH₃ + KH₂PO₂ using the smallest whole-number coefficients. What is the sum of all five coefficients?

  1. A) 10
  2. B) 9
  3. C) 11
  4. D) 12

Q6.

Chlorine reacts with hot concentrated sodium hydroxide according to Cl₂ + NaOH → NaCl + NaClO₃ + H₂O. When balanced with the smallest whole-number coefficients, what is the coefficient of NaCl?

  1. A) 3
  2. B) 6
  3. C) 4
  4. D) 5

Q7.

Which equation correctly represents the complete combustion of butane, C₄H₁₀, using the smallest whole-number coefficients?

  1. A) C₄H₁₀ + 6O₂ → 4CO₂ + 5H₂O
  2. B) 2C₄H₁₀ + 10O₂ → 8CO₂ + 5H₂O
  3. C) 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
  4. D) 4C₄H₁₀ + 13O₂ → 16CO₂ + 20H₂O

Q8.

In the equation Ca₃(PO₄)₂ + SiO₂ + C → P₄ + CaSiO₃ + CO, what are the smallest whole-number coefficients of Ca₃(PO₄)₂, SiO₂ and C, respectively?

  1. A) 1, 3, 5
  2. B) 2, 3, 10
  3. C) 2, 6, 10
  4. D) 4, 6, 5

Q9.

The figure shows an unbalanced chemical equation. Which sequence gives the smallest whole-number coefficients for the substances from left to right?

Diagram for question 9: The figure shows an unbalanced chemical equation. Which sequence gives the smallest whole-number…
  1. A) 12, 3, 12, 6
  2. B) 10, 3, 10, 6
  3. C) 10, 6, 10, 3
  4. D) 5, 3, 5, 3

Q10.

The figure shows copper reacting with dilute nitric acid. Which sequence gives the smallest whole-number coefficients for the five substances from left to right?

Diagram for question 10: The figure shows copper reacting with dilute nitric acid. Which sequence gives the smallest whole-number…
  1. A) 2, 6, 2, 1, 3
  2. B) 3, 6, 3, 1, 3
  3. C) 1, 4, 1, 2, 2
  4. D) 3, 8, 3, 2, 4

What this assessment covers

Concepts Tested

  • Chemical Equations

Question Mix

  • Hard questions included

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