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Bang Goes the Theory presenter Dr Yan asked several members of the public if iron wool will become heavier or lighter when burnt in air. Dr Yan demonstrates iron wool burning and the product of the reaction while asking the audience what they think is happening in terms of a reaction. The mass of the iron wool before and after is compared and the presenter gives a scientific explanation as to why. The analogy is made between the mass gained when the iron is burnt compared to when it rusts.
Could be a starter or plenary when pupils are conduct experiments burning magnesium in air or reacting iron and sulphur.
Clip 25 from the Bang Goes the Theory teachers pack. To download the pdf please go to bbc.co.uk/schools/teachers/bang/.
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