Chemistry
Give the main experimental points only to demonstrate that —
(a) magnesium
(b) candle
gains weight on burning.
Air
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Answer
(a) Magnesium gains weight on burning due to the mass of the oxygen of the air which has combined with magnesium forming magnesium oxide.
(b) Candle gains weight on burning due to mass of oxygen of the air which has combined with carbon and hydrogen of the candle CxHy producing water vapour and carbon dioxide.
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