Dry, unpolluted air is a mixture of different gases, mainly nitrogen and oxygen.
State the approximate percentage by volume of nitrogen in dry, unpolluted air.
Neon makes up about 0.0018% of dry air. State the chemical symbol for neon and explain why it is extremely unreactive.
Give the name or formula of a gas formed when fossil fuels containing sulfur impurities are burned, which is a major cause of acid rain.
A student carried out an experiment to determine the percentage of oxygen in a sample of air using the apparatus shown below.
The student recorded the following results after leaving the experiment to run for one week:
Some of the iron turned into rust. Write the word equation for this reaction.
Use the student's results to calculate the percentage of oxygen by volume in this sample of air. Give your answer to one decimal place.
The student left the apparatus in place for an additional week. How could they use a further measurement to confirm that all of the oxygen had reacted during the first week?
