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 Form 1 Chemistry Topical Questions and Answers on Air and Combustion

Using iron fillings, describe an experiment that can be conducted to show that oxygen is present in air.

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Answer Text:
- Moisten a measuring cylinder and sprinkle some iron fillings in the cylinder.
- Invert the cylinder in a water trough containing water and note the level of water in the cylinder.
- After 2 to 3 days, iron fillings will turn from grey to brown and the water level in the measuring cylinder therefore rises to occupy the space left by oxygen present in air.