A student set up an experiment to investigate the rusting of iron. They placed a small mass of damp iron filings at the bottom of a boiling tube and inverted it over a beaker of water.
After a week, the water level rose and then stopped. Some oxygen still remained in the boiling tube.
Give one reason why not all of the oxygen reacted.
Practise Edexcel GCSE Chemistry Earth and atmospheric science with exam-style questions for Foundation and Higher tier. 62 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
