Chemistry
Give reasons:
When magnesium is burnt in air, there is an increase in mass after the reaction.
Matter
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Answer
When magnesium is burnt in air, it forms magnesium oxide. The mass of magnesium oxide is found to be more than the mass of magnesium because the mass of oxygen used is not taken into consideration. If that is considered the total mass of the reactants and the products are found to be almost equal.
2Mg + O2 2MgO
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