Edexcel IGCSE Chemistry 2.9 gas composition of air
Practise air-composition questions by matching gases to percentage values and explaining what remains after oxygen is removed.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- Identify nitrogen as about 79-80% of dry air and the most abundant gas.
- Recall oxygen as about 21% of dry air and argon as about 1% by volume.
- Use approximate percentages to explain why gas left after oxygen removal is mostly nitrogen.
2.9 Gas composition of air question 1
This question is about gases.
Question (a)
(a)
The table gives information about five gases.
Use information from the table to answer these questions.
Each gas may be used once, more than once or not at all.
[ 2 ]
Question (i)
(i)
Give the name of the gas that is about 79% of the atmosphere by volume.
[ 1 ]
Question (ii)
(ii)
Give the name of the gas that is not normally found in the atmosphere.
[ 1 ]
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