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Simple molecules and covalent bonds: CAIE IGCSE Chemistry questions

Every CAIE IGCSE Chemistry exam question on 2.5 Simple molecules and covalent bonds, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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407 questions

  1. Q6

    June 2024 · Paper 1

    1 mark2.5 Simple molecules and covalent bonds
    The whole paper ↗
    June 2024 Paper 1, question 6: A covalent molecule, M, contains four shared pairs of electrons. What is M? A ammonia, NH3 B hydrogen chloride, HCl C methane, CH4 D water, H2O

  2. Q8

    June 2024 · Paper 2

    1 mark2.5 Simple molecules and covalent bonds
    The whole paper ↗
    June 2024 Paper 2, question 8: How many electrons are shared in one molecule of nitrogen and in one molecule of ethene? nitrogen ethene A 2 12 B 2 8 C 6 12 D 6 8

  3. Q1(b)

    June 2024 · Paper 3

    2 marks2.5 Simple molecules and covalent bonds
    The whole paper ↗
    June 2024 Paper 3, question 1(b): Complete Fig. 1.2 to show the dot-and-cross diagram for structure C. Show the outer shell electrons only. O H H Fig. 1.2 [2] [Total: 8]

  4. Q3(b)(ii)

    June 2024 · Paper 4

    2 marks2.5 Simple molecules and covalent bonds
    The whole paper ↗
    June 2024 Paper 4, question 3(b)(ii): Complete the dot-and-cross diagram in Fig. 3.1 of a molecule of fluorine. Show outer shell electrons only. F F Fig. 3.1 [2]

  5. Q3(b)(iv)

    June 2024 · Paper 4

    3 marks2.4 Ions and ionic bonds2.5 Simple molecules and covalent bonds
    The whole paper ↗
    June 2024 Paper 4, question 3(b)(iv): Explain in terms of structure and bonding why sodium fluoride has a much higher melting point than fluorine. [3]

  6. Q5

    Specimen · Paper 1

    1 mark2.5 Simple molecules and covalent bonds
    The whole paper ↗
    Specimen Paper 1, question 5: A covalent molecule M contains a total of four shared electrons. What is M? A ammonia, NH3 B hydrogen chloride, HCl C methane, CH4 D water, H2O

  7. Q5(a)

    Specimen · Paper 3

    2 marks2.6 Giant covalent structures2.5 Simple molecules and covalent bonds
    The whole paper ↗
    Specimen Paper 3, question 5(a): Complete Table 5.1 to show the electrical conductivity of solid diamond and molten sulfur. [2]

  8. Q5(b)

    Specimen · Paper 3

    1 mark2.5 Simple molecules and covalent bonds
    The whole paper ↗
    Specimen Paper 3, question 5(b): State one piece of evidence from Table 5.1 that shows that sulfur is a simple molecular substance. [1]

  9. Q7(b)(iii)

    Specimen · Paper 3

    2 marks2.5 Simple molecules and covalent bonds
    The whole paper ↗
    Specimen Paper 3, question 7(b)(iii): Complete the dot-and-cross diagram in Fig. 7.1 of a molecule of chlorine. Show outer shell electrons only. Cl Cl Fig. 7.1 [2] [Total: 7]

  10. Q6(c)(ii)

    Specimen · Paper 4

    2 marks2.5 Simple molecules and covalent bonds
    The whole paper ↗
    Specimen Paper 4, question 6(c)(ii): Draw a dot-and-cross diagram to show a molecule of ethene, CH2=CH2. Show outer shell electrons only. [2]
All 10 questions on Simple molecules and covalent bonds, as a list
  1. June 2024, Paper 1, Q6 (1 mark): A covalent molecule, M, contains four shared pairs of electrons. What is M? A ammonia, NH3 B hydrogen chloride, HCl C methane, CH4 D water, H2O
  2. June 2024, Paper 2, Q8 (1 mark): How many electrons are shared in one molecule of nitrogen and in one molecule of ethene? nitrogen ethene A 2 12 B 2 8 C 6 12 D 6 8
  3. June 2024, Paper 3, Q1(b) (2 marks): Complete Fig. 1.2 to show the dot-and-cross diagram for structure C. Show the outer shell electrons only. O H H Fig. 1.2 [2] [Total: 8]
  4. June 2024, Paper 4, Q3(b)(ii) (2 marks): Complete the dot-and-cross diagram in Fig. 3.1 of a molecule of fluorine. Show outer shell electrons only. F F Fig. 3.1 [2]
  5. June 2024, Paper 4, Q3(b)(iv) (3 marks): Explain in terms of structure and bonding why sodium fluoride has a much higher melting point than fluorine. [3]
  6. Specimen, Paper 1, Q5 (1 mark): A covalent molecule M contains a total of four shared electrons. What is M? A ammonia, NH3 B hydrogen chloride, HCl C methane, CH4 D water, H2O
  7. Specimen, Paper 3, Q5(a) (2 marks): Complete Table 5.1 to show the electrical conductivity of solid diamond and molten sulfur. [2]
  8. Specimen, Paper 3, Q5(b) (1 mark): State one piece of evidence from Table 5.1 that shows that sulfur is a simple molecular substance. [1]
  9. Specimen, Paper 3, Q7(b)(iii) (2 marks): Complete the dot-and-cross diagram in Fig. 7.1 of a molecule of chlorine. Show outer shell electrons only. Cl Cl Fig. 7.1 [2] [Total: 7]
  10. Specimen, Paper 4, Q6(c)(ii) (2 marks): Draw a dot-and-cross diagram to show a molecule of ethene, CH2=CH2. Show outer shell electrons only. [2]

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