10.3.1 — Air Composition
Cambridge IGCSE Chemistry (0620) · 15 Questions · 20 Total Marks
Section A: Percentages
State the percentage of nitrogen in clean, dry air.
State the percentage of oxygen in clean, dry air.
What percentage of clean, dry air is made up of gases other than nitrogen and oxygen?
A student claims that air is approximately 80% nitrogen and 20% oxygen. State whether this is correct and give the accurate figures.
Clean, dry air consists mainly of two gases. State the name and percentage of each gas.
Section B: Minor Components
Name two gases that make up the remaining approximately 1% of clean, dry air.
Which noble gas is the most abundant in the atmosphere?
State the approximate percentage of carbon dioxide in clean, dry air.
A sample of clean, dry air is found to contain 99% nitrogen and oxygen combined. Name the type of gases that make up the remaining 1% and give one specific example.
Explain why water vapour is NOT listed as a component of clean, dry air, even though it is present in the atmosphere.
Section C: Formulae
Write the chemical formula for the most abundant gas in the atmosphere.
Write the chemical formula for the gas in air that is essential for combustion and respiration.
Write the chemical formula for the greenhouse gas present in small amounts in clean, dry air.
Write the chemical formulae for the two most abundant gases in clean, dry air, and state the percentage of each.
Argon is present in the air. Write its chemical symbol/formula.
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