Question

When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished.
(a) Name the substance X.
(b) How does this substance extinguish the fire?
(c) Name another substance which behaves like X.

Answer 1

Answer:

(a) Sodium hydrogen carbonate.

(b) The heat of fire decomposes sodium bicarbonate to produce carbon dioxide gas. This carbon dioxide covers the fire like a blanket and cuts off supply of air to the burning substance. Due to this the fire gets extinguished.

(c) Potassium hydrogen carbonate.

Explanation:

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Answer 2

X is Sodium hydrogen carbonate

Explanation:

(a) Sodium hydrogen carbonate is the dry powder used as a fire extinguisher.

(b) When heated to a high temperature, the chemical properties of this salt make it produce lots of carbon dioxide, thus removing oxygen surrounding the fire. When oxygen supply is cut off, the fire is put out.

(c) Sodium bicarbonate also behaves like Sodium hydrogen carbonate and helps extinguish fire.