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 Form 1 Chemistry Topical Questions and Answers on Air and Combustion

In an experiment. A piece of magnesium ribbon was cleaned with steel wool. 2.4g of the clean magnesium ribbon was placed in a crucible and completely burnt in oxygen. After cooling, the product weighed 4.0g.
(a) Explain why it was necessary to clean the magnesium ribbon?
(b)what observation was made in the crucible after burning?

 (11m 2s)
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