0653.C2.4.02 — Describe the formation of covalent bonds 4 Describe the formation of covalent bonds in in simple molecules, including H2, Cl 2, simple molec: past paper questions
Real questions on 0653.c2.4.02 — describe the formation of covalent bonds 4 describe the formation of covalent bonds in in simple molecules, including h2, cl 2, simple molec
The newest 10 of 10 written questions. Open one to see it on the real paper.
- 0653/41 · October/November 2025 · Q6b[2]
Complete the dot-and-cross diagram in Fig. 6.2 to show the bonding in an ethene molecule. Show only the outer-shell electrons. C C H H H H
See it on the paper → - 0653/42 · October/November 2025 · Q5b(i)[2]
Complete the dot-and-cross diagram in Fig. 5.1 to show the bonding in a carbon dioxide molecule. Show only the outer-shell electrons. C O O (b) (i)
See it on the paper → - 0653/41 · May/June 2025 · Q6a[4]
Dilute nitric acid and solid copper oxide react to form copper nitrate. Copper oxide is an insoluble base and copper nitrate is a soluble salt. Describe how to produce pure, dry crystals of copper nitrate.
See it on the paper → - 0653/32 · February/March 2025 · Q5d(ii)[1]
State the number of electrons shared between the carbon atoms in a molecule of ethane.
See it on the paper → - 0653/43 · October/November 2024 · Q8a[3]
The formula for methanol is CH 3 OH. Complete the dot-and-cross diagram in Fig. 8.1 to show the bonding in methanol. Show outer-shell electrons only. C O H H H H
See it on the paper → - 0653/43 · October/November 2024 · Q8b(i)[1]
State one difference in the bonding of ethene and of ethane. (i)
See it on the paper → - 0653/32 · February/March 2024 · Q5d[2]
Hydrogen chloride, HCl , is a covalent molecule. Complete Fig. 5.2 to show the dot-and-cross diagram for a molecule of hydrogen chloride. Show only the electrons in the outer shells. H Cl Fig. 5.2
See it on the paper → - 0653/43 · October/November 2023 · Q5c[2]
The structure of carbon dioxide is shown in Fig. 5.2. Fig. 5.2 State the number of electrons that are shared between the carbon atom and one oxygen atom in a molecule of carbon dioxide. Give a reason for your answer. number of electrons reason
See it on the paper → - 0653/43 · October/November 2023 · Q5d[2]
Complete Fig. 5.3 to show the dot‑and‑cross diagram of a molecule of nitrogen. Show all of the outer shell electrons. N N Fig. 5.3
See it on the paper → - 0653/32 · February/March 2023 · Q8a(iii)[1]
Complete Fig. 8.1 to show the dot‑and‑cross diagram of a molecule of methane. Show only the outer shell electrons. H H C H H Fig. 8.1
See it on the paper →
What examiners said
Some candidates wrote some very good descriptions of this process which suggested that they had experience of carrying out the preparation themselves. Some candidates clearly knew in principle how to carry out the procedure but could not express the correct sequence of steps clearly enough. Many descriptions referred to ‘heating to crystallisation point’, but no credit was available for this witho...
— Examiner report, May/June 2025, 0653/41 Q6(a) (Cambridge)
This question proved challenging for most candidates. Only a few responses were correct, with the answer of two electrons. The most common incorrect answer was six electrons, the number shared by the two carbon atoms with hydrogen in the molecule. Since the bond in the question is a carbon–carbon single bond, the number of shared electrons is two.
— Examiner report, February/March 2025, 0653/32 Q5(d)(ii) (Cambridge)
Many candidates gained full credit for this question. Partial credit was awarded to those candidates who showed one pair of electrons being shared. Incorrect responses included two pairs of electrons in the bond and incorrect or missing electrons in the rest of the molecule.
— Examiner report, February/March 2024, 0653/32 Q5(d) (Cambridge)
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