Question detail
In a classroom experiment, students compare the flammability of methane and octane. Which result is most likely?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Carbon compounds as fuels and feedstock
Question
- A. Methane burns faster than octane.
- B. Octane burns faster than methane.
- C. Both burn at the same rate.
- D. Neither burns in air.
Answer
The correct option is Methane burns faster than octane..
Explanation
The correct option is Methane burns faster than octane.. Methane burns faster than octane. is correct because it directly supports the approved learning objective to investigate the properties of different hydrocarbons. (WS 1.2, 4.1). This belongs to Properties and combustion of hydrocarbons within Carbon compounds as fuels and feedstock, so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Misidentifying Hydrocarbon Types
Students often assume all hydrocarbons are alkanes and ignore the presence of alkenes and other unsaturated compounds in crude oil.
Remind students that crude oil contains a wide range of hydrocarbons, including alkanes, alkenes, and other unsaturated species; they should distinguish these by their general formulas (CₙH₂ₙ₊₂ for alkanes, CₙH₂ₙ for alkenes) and by recognising unsaturation through tests such as bromine water.
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