Question

The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.
a. Name the substance (i) X (ii) Y and (iii) Z
b. What is the process of conversion of X into Y known as?
c. At which temperature X gets converted into Y?
d. What is the process of conversion of X into Z known as?
e. At which temperature X gets converted into Z?

Answer 1

a. X is a gas or vapour
Y is solid like ice
Z is liquid
b. Firstly X is compressed with large pressure and it turns into liquid (Z) and it freeze so the liquid is converted into solid (ice) Y
c. 0 degree C
d. Firstly X get converted into liquid (Z) and it freeze it gets converted into solid (ice) [Y} and after freezing the solid (ice) [Y] is heated at the temperature of 100 degree C and it converted into liquid (Y)
e. Firstly the temperature goes to 0 degree C and after freeze it will come 100 degree C from 0 degree C

Answer 2

Here are the solutions >>>

(a) The substance X is water since it turns anhydrous copper sulphate blue.

The substance Y is ice since water changes to ice upon cooling.

The substance Z is water vapour since water changes to water vapour upon heating.

(b)  The process of conversion of X into Y is known as freezing.

(c ) The temperature called freezing point of water is 0°C.

(d) Water upon heating gets converted into steam (Z) and the process is known as boiling.

(e ) X gets converted into Z at its boiling point temperature. It is 100°C.

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