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ICSE Class 7 Chemistry Question 16 of 20

Air & Atmosphere — Question 19

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Question

Question 19

Give the main experimental points only to demonstrate that —

(a) magnesium

(b) candle

gains weight on burning.

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.