(a) Describe the nature of glass?
(b) What are the differences between physical adsoprtion and chemical adsorption?

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Solution

(a)
The nature of glass:
Glass is a super cooled liquid. It is also called psuedo solid. It is an amorphous solid and behaves like fluids and very slowly floats under gravity. The lower sides of glass panes of windows, photoframes, cupboards and showcases become slightly thicker and upper ends become thinner.
(b) The differences between physical adsoprtion and chemical adsorption:

Physical adsoprtion Chemical adsorption
It has low heat of adsorption (20 to 40 kJ/mol).
It has high heat of adsorption (40 to 200 kJ/mol).
Several layers of adsorbed particles are formed.
Only one layer of adsorbed particles is formed.
It is relatively weak.
It is relatively strong.

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Similar questions

Which statements are correct ?

i) physical adsorption is due to Vander Waal’s forces

ii) physical adsorption decreases at high temperature

iii) physical adsorption is irreversible

iv) enthalpy for a chemical adsorption is generally lesser than that of physical adsorption

Which statement is/are correct?

i) Physical adsorption is due to Vander Waal's forces

ii) Physical adsorption decreases at high temperature

iii) Physical adsorption is irreversible

iv) Enthalpy for a chemical adsorption is generally lesser than that of physical adsorption

Which statement is/are correct?

i) Physical adsorption is due to Vander Waal's forces

ii) Physical adsorption decreases at high temperature

iii) Physical adsorption is irreversible

iv) Enthalpy for a chemical adsorption is generally lesser than that of physical adsorption

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Physical adsoprtion	Chemical adsorption
It has low heat of adsorption (20 to 40 kJ/mol).	It has high heat of adsorption (40 to 200 kJ/mol).
Several layers of adsorbed particles are formed.	Only one layer of adsorbed particles is formed.
It is relatively weak.	It is relatively strong.