The newest 7 of 7 written questions. Open one to see it on the real paper.
Pentene is a member of a homologous series. State what is meant by a homologous series.
See it on the paper →State what is meant by unsaturated compound. (b) Alkenes are unsaturated compounds.
See it on the paper →State how the information in Table 6.2 shows that alkenes are hydrocarbons.
See it on the paper →Complete the sentence about hydrocarbons. Hydrocarbons are molecules that contain and only.
See it on the paper →Methane is a member of the alkane homologous series. Describe what is meant by the term homologous series.
See it on the paper →Ethane and ethene are not in the same homologous series. Explain what is meant by the term homologous series.
See it on the paper →The hydrocarbon C 18 H 38 is an alkane. The alkanes are a homologous series. Explain what is meant by the term homologous series.
See it on the paper →Some candidates referred to double bonds when stating what is meant by unsaturated. Other candidates were more precise in referring to this double (or triple) bond, describing it occurring between carbon atoms and frequently also wrote C=C in their answer.
— Examiner report, May/June 2025, 0653/42 Q6(b) (Cambridge)
Most candidates were familiar with the term hydrocarbons and knew that it is essential to use the word ‘only’ when referring to them containing only hydrogen and carbon atoms.
— Examiner report, May/June 2025, 0653/43 Q6(b)(iii) (Cambridge)
Many candidates had learned the definition of homologous series and so were awarded full credit. It was important to avoid phrases such as “compounds that have the same properties” which was not accepted as an alternative for “similar chemical properties”.
— Examiner report, February/March 2024, 0653/42 Q8(b) (Cambridge)
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