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WAEC WASSCE 2023

WAEC Chemistry 2023 past questions

5 objective questions from the 2023 WAEC Chemistry paper. Answer each one, then reveal the answer and explanation.

All WAEC Chemistry past questions

  1. Question 1

    Electronic configuration

    What is the electronic configuration of beryllium (atomic number 4)?

    1. Option A: 2, 1
    2. Option B: 2, 3
    3. Option C: 2, 2
    4. Option D: 2, 4
    Show the answer to question 1

    Answer: C, 2, 2

    Fill the shells in order, 2 then 8 then 8: beryllium has 4 electrons, arranged 2, 2.

  2. Question 2

    Atomic structure

    An atom of nitrogen has atomic number 7 and mass number 14. How many neutrons are in its nucleus?

    1. Option A: 7
    2. Option B: 14
    3. Option C: 21
    4. Option D: 8
    Show the answer to question 2

    Answer: A, 7

    Neutrons = mass number − atomic number = 14 − 7 = 7.

  3. Question 3

    Chemical symbols

    What is the chemical symbol of antimony?

    1. Option A: Sb
    2. Option B: An
    3. Option C: A
    4. Option D: At
    Show the answer to question 3

    Answer: A, Sb

    Antimony is Sb, from its Latin name stibium.

  4. Question 4

    Gas laws

    A fixed mass of gas occupies 480 cm³ at a pressure of 3 atm. What volume will it occupy at 2 atm if the temperature stays constant?

    1. Option A: 320 cm³
    2. Option B: 480 cm³
    3. Option C: 720 cm³
    4. Option D: 2880 cm³
    Show the answer to question 4

    Answer: C, 720 cm³

    By Boyle's law, P₁V₁ = P₂V₂, so V₂ = 3 × 480 ÷ 2 = 720 cm³.

  5. Question 5

    Organic chemistry

    What is the molecular formula of propene?

    1. Option A: C₃H₆
    2. Option B: C₃H₈
    3. Option C: C₃H₄
    4. Option D: C₃H₇
    Show the answer to question 5

    Answer: A, C₃H₆

    Alkenes follow CₙH₂ₙ, so propene with 3 carbon atoms is C₃H₆.

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