Question

(iv) What do you observe when :
(a) A candle is burnt.
(b) A magnesium ribbon is burnt in air.​

Answer 1

Answer:

• As the candle burns, solid wax becomes liquid and then evaporates to become a gas. The gaseous wax burns in oxygen to produce water, carbon dioxide, heat and light. The burning candle also produces carbon, in the form of the black soot we see on the spoon

• The ribbon burns with a bright white light. Intense heat is also produced in this reaction. Here, when magnesium burns, it reacts with the oxygen found in air to form a powdery ash called magnesium oxide.

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