(a)[1]
State which gas from the list is green.
(b)[1]
The gases shown are diatomic molecules. State the name of another element that forms diatomic molecules and is gaseous at room temperature and pressure.
(c(i))[1]
When separate samples of each gas are put into a container, they will diffuse. Describe why these gases diffuse.
(c(ii))[2]
State which of these four gases diffuses most quickly. Explain your answer.
(d(i))[1]
Nitrogen, oxygen and other substances are found in clean, dry air. State the percentage of nitrogen in clean, dry air.
(d(ii))[1]
Other than nitrogen and oxygen, identify another element found in clean, dry air.
(d(iii))[1]
Identify a compound found in clean, dry air.
(d(iv))[2]
Nitrogen and oxygen can be separated from liquid air. State the name of this process.