0653.C2.4.03 — Describe the properties of simple molecular compounds: (a). low melting points and boiling points (b). poor electrical conductivity: past paper questions
Real questions on 0653.c2.4.03 — describe the properties of simple molecular compounds: (a). low melting points and boiling points (b). poor electrical conductivity
The newest 10 of 10 written questions. Open one to see it on the real paper.
- 0653/43 · May/June 2025 · Q4a(i)[2]
Identify the compound in Table 4.1 that is a solid at 25 °C and has only covalent bonding. Explain your choice. explanation compound
See it on the paper → - 0653/43 · May/June 2025 · Q4a(ii)[1]
Identify the compound in Table 4.1 that is a simple molecular compound. Explain your choice. explanation compound
See it on the paper → - 0653/33 · May/June 2024 · Q2b(i)[1]
Identify the gas produced in the reactions shown in Fig. 2.2.
See it on the paper → - 0653/33 · May/June 2024 · Q2b(ii)[3]
Suggest the identity of metal A and the identity of metal B. Explain your answer. metal A metal B explanation
See it on the paper → - 0653/42 · May/June 2024 · Q2a[2]
separation process description crystallisation separating an insoluble solid from a mixture of a solid in water filtration separating dyes from a mixture of dyes in a coloured ink chromatography separating a salt from an aqueous solution (a) For each separation process, draw one straight line to the correct description...
See it on the paper → - 0653/42 · May/June 2024 · Q2b[3]
Pure water is separated from a mixture of soluble salt and water by distillation. Fig. 2.1 shows the apparatus used. thermometer pure water soluble salt and water Fig. 2.1 Explain how pure water is separated from this mixture by distillation. ,
See it on the paper → - 0653/42 · February/March 2024 · Q2c[3]
Table 2.1 shows the boiling points of nitrogen and potassium nitrate. Table 2.1 boiling point / °C nitrogen –196 potassium nitrate 400 Explain why potassium nitrate has a much higher boiling point than nitrogen.
See it on the paper → - 0653/42 · February/March 2023 · Q5a[2]
Name the solute and the solvent in aqueous magnesium sulfate. solute solvent
See it on the paper → - 0653/42 · February/March 2023 · Q5c[4]
Magnesium sulfate is made in reactions between solid magnesium or solid magnesium compounds and dilute acid. Complete Table 5.1 to show the substances used and the products formed in these reactions. Table 5.1 substances used products formed solid dilute acid magnesium sulfate + magnesium magnesium sulfate + magnesium...
See it on the paper → - 0653/11 · October/November 2022 · Q4[1]
Which row is the correct result for a sample containing only fat and starch?
See it on the paper →
What examiners said
Some candidates found this demanding. For the correct identification of B, a reference to melting point was needed to explain why it is solid at 25 °C and the link to covalent bonding as it does not conduct electricity.
— Examiner report, May/June 2025, 0653/43 Q4(a)(i) (Cambridge)
Some candidates gained credit for identifying compound C as a gas (due to its boiling point) and linked that with the phrase simple molecular compound.
— Examiner report, May/June 2025, 0653/43 Q4(a)(ii) (Cambridge)
This was a challenging question for many candidates. The best answers referred to the structural differences between potassium nitrate and nitrogen, the difference in the attractive forces in these substances and the difference in the energy required to separate particles. Candidates needed to refer to both substances when making these comparisons and so full credit could not be awarded for a desc...
— Examiner report, February/March 2024, 0653/42 Q2(c) (Cambridge)
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