Showing that air contains about one-fifth oxygen
1 mark · EasyName one substance (other than a metal) that can be used to remove oxygen from air in an experiment to determine its percentage.
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Phosphorus
Also accept: phosphorus
Common mistakes: Sulfur; Hydrogen
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Marking points
I1 · 1 mark · Identifies phosphorus as a suitable non-metal
Worked solution
Phosphorus is a non-metal that can be used to remove oxygen from air in such an experiment.