Question

potassium chloride is added to water and stirred. A salt solution is obtained which is the
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.
dj 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 ​

Answer 1

a) Physical Change

b) KCl (Potassium Chloride)

c) Reversible Change

d) No

e) If we take CaCO3 (Calcium Carbonate) instead of KCl, then on heating the solution, it undergoes Chemical Change (Thermal Decomposition Reaction) and get converted into Calcium oxide and Carbon dioxide.

CaCO3 → CaO + CO2

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Answer 2

Answer:

(a) it is a physical change.

(b) the residue was the Potassium Chloride which remains behind salt solution is boiled

(c)The change is reversible.

(d)No, .............not altered

(e) Because if we will take CaCO3 after heating a new substance would formed as product...

Explanation:

(a)...Besause it has all the properties of physical change.