The table shows some information about five gases.
| Gas | Formula | Boiling point in ∘C^\circ\text{C}∘C |
|---|---|---|
| ammonia | NH3\text{NH}_3NH3 | -33 |
| propane | C3H8\text{C}_3\text{H}_8C3H8 | -42 |
| carbon dioxide | CO2\text{CO}_2CO2 | -78 |
| argon | Ar\text{Ar}Ar | -186 |
| helium | He\text{He}He | -269 |
Choose gases from the table to answer this question.
You may use each gas once, more than once, or not at all.
Refer to the following relative atomic masses: H=1\text{H} = 1H=1, He=4\text{He} = 4He=4, C=12\text{C} = 12C=12, N=14\text{N} = 14N=14, O=16\text{O} = 16O=16, Ar=40\text{Ar} = 40Ar=40.
Name the gas that is a hydrocarbon.
Name the gas that turns damp red litmus paper blue.
Name the gas that is produced during aerobic respiration.
Name the noble gas in the table that has the higher boiling point.
Name the gas that has the highest boiling point.
Determine the two gases that have the same relative formula mass.
29 exam-style questions on Edexcel IGCSE Chemistry Elements, compounds and mixtures. Each one has a worked solution and a mark scheme showing where the marks go.