Question

define physical and chemical adsorption​

Answer 1

Adsorption

Adsorption is the process of sticking of molecules on the surface .

Physical adsorption

Physical adsorption refers to the process by which molecules stick to the surface of a body by physical change.

It is a reversible change and it is a physical change.

Chemical adsorption

Chemical adsorption refers to the process by which molecules stick to the surface of a body by chemical interactions.

It is a chemical change and stronger than the physical adsorption.

Answer 2

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♣️Physical Adsorption

1. This is usually takes place at low temperature and decreases with increase in temperature.

2. The forces of attraction holding the adsorbate are Vander Waal’s forces

3. Heat of adsorption is low

4. It is reversible

5. It is not very special energy

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♣️Chemical Adsorption

1. This takes place at high temperature

2. The forces of attraction holding the adsorbate are chemical bond forces

3.Heat of adsorption is high

4. It is irreversible

5. It is highly specific

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