CAIE A Level Chemistry 9701 · Hydrocarbons
A gas stove burns propane, , in a well-ventilated kitchen. A faulty stove in a poorly ventilated room may burn propane with a limited supply of air.
Compare the complete and incomplete combustion of propane in terms of the products formed and the environmental consequences of each.
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.