Describe5 marksStandard
A catalytic converter fitted to a petrol engine removes nitrogen oxides, and , from the exhaust gases.
Describe and explain how the catalytic converter removes nitrogen oxides from the exhaust gases.
CAIE A Level Chemistry 9701 · Nitrogen and sulfur
Nitrogen and sulfur: describe question
How this question is marked
5 marks, so the mark scheme is looking for about 5 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.
More Nitrogen and sulfur questions
- 5 marks · Oxides of nitrogen are present in the exhaust gases of internal combustion engines and are removed by catalytic converters. Describe the…
- 4 marks · Nitrogen gas (N2) is relatively unreactive, yet oxides of nitrogen such as NO and NO2 are formed in internal combustion engines and…
- 5 marks · When welding reactive metals such as titanium, the metal is often heated in an atmosphere of nitrogen rather than air. Using your…
- 5 marks · Molten magnesium is produced in an atmosphere of nitrogen gas to prevent it from reacting with oxygen in the air. Using your knowledge of…
- 5 marks · Compare the chemical reactivity of dinitrogen, N2, with that of ammonia, NH3. In your answer, include: an explanation of the lack of…
- 5 marks · Nitrogen, N2, is an element and ammonia, NH3, is one of its compounds. They behave very differently. (a) Nitrogen is unreactive at room…
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.