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Meaning of the term hydrocarbon
Alkanes and alkenes are hydrocarbons.
Define the term ‘hydrocarbon’.
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Marking points
- 1 States that a hydrocarbon contains carbon and hydrogen atoms only.
Full-mark answer
A hydrocarbon is a substance whose molecules contain carbon and hydrogen atoms only.
Why this answer loses marks
A hydrocarbon contains carbon and hydrogen.
This omits “only”, so it does not rule out molecules that also contain other elements.