Question 3(a)(i)
[Maximum number: 1]
This question is about nitrogen and some of its compounds.
Nitrogen is converted into ammonia, , in the Haber process.
Nitrogen is obtained from air.
State the percentage of nitrogen in clean, dry air.
CAIE IGCSE Chemistry Clean Dry Air Composition
Practise recalling the approximate percentage composition of clean dry air and identifying nitrogen, oxygen, noble gases and carbon dioxide correctly.
How this is tested
- state that clean dry air contains approximately 78 percent nitrogen and 21 percent oxygen
- identify most of the remainder as noble gases, especially argon, with a small carbon dioxide fraction
- distinguish elements in air from carbon dioxide as a compound when interpreting tables