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CAIE A Level Chemistry 9701 · Nitrogen compounds

Nitrogen compounds: suggest question

Suggest7 marksChallenge

A student plans to prepare methylamine, CHX3NHX2\ce{CH3NH2}, by heating iodomethane with ammonia in ethanol in a sealed tube.

(a) Write an equation for the formation of methylamine in this reaction.

(b) Suggest why the reaction is carried out in a sealed tube rather than in an open flask.

(c) The reaction mixture also contains ammonium iodide, NHX4I\ce{NH4I}. Suggest how this substance is formed.

(d) The student repeats the experiment using an excess of iodomethane. Suggest the organic product that is formed in addition to methylamine, and explain how it is formed.

0 words · 7 marks

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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.

Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.

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