CAIE A Level Chemistry 9701 · Nitrogen compounds
A student prepares propylamine by heating 1-bromopropane with excess ammonia in ethanol under pressure. The resulting mixture contains propylamine, dipropylamine, and tripropylamine.
Explain why a mixture of amines is produced and state the purpose of using a high pressure and an excess of ammonia.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.