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The substance X normally exists in a phy...

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 substances X.
(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 temperture X gets converted into Z ?

Text Solution

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(a) The substance X is water since it turns anhydrous copper sulphate blue.
(b) The substance Y is ice since water changes to ice upon excessive cooling. The process of conversion of X into Y is known as freezing.
(c ) The temperature called freezing point of water is `0^(@)C` or 273 K.
(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` or 373 K.
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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 substances (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 ?

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