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Chemistry

Potassium chloride is added to water and stirred. A salt solution is obtained which is then boiled leaving behind a residue

(a) Is the above change physical or chemical?

(b) Name the residue which remains behind after the salt solution is boiled.

(c) Is the change reversible or not reversible?

(d) Are the composition and properties of the original substance altered.

(e) Give a reason why the above experimentation would not be possible, if calcium carbonate is taken, in place of potassium chloride.

Phy & Chem Changes

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Answer

(a) Physical change

(b) Potassium chloride

(c) Reversible, as salt initially added to water is finally recovered after boiling the water.

(d) No

(e) Calcium carbonate reacts with water to form calcium hydroxide, hence a new substance is formed so the change will be chemical not physical.

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