CAIE A Level Chemistry 9701 · Nitrogen and sulfur
In the manufacture of reactive metals, nitrogen gas is sometimes used to blanket the molten metal and exclude air. A student suggests that nitrogen is an ideal choice because it is completely unreactive. Describe the reasons why nitrogen is so unreactive, and explain why the student's suggestion is not quite correct.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.