What is polymer ?

Question :What is polymer ?

It's define as the Very large molecules (macromolecule)  having molecular mass (10-10u) .it is formed by joining of several smaller units (Monomers) through the chemical bonds by the process of polymerization example of Polymer is : Silk, Rubber ,wool etc.

Questions: What is different between physiorption and chemisorption 

Physiorption : 

• it is mainly formed  due to the Vander waal forces.
• It's not specific in the nature 
• It's reversible in nature 
• It's enthalpy of adsorption is low as campared to chemisorption (approximately 20 — 40 KJmol-¹ )
• It's more easily liquefible gases are absorbed readily as well it's depend on Nature of gas .
• Low temperature is favourable for it 
• No appreciable activation energy is required .
• It's results into multimolecular layers on the absorbent surface under the higher pressure .

Chemisorption : 

• It is formed sure to the formation of chemical bonds 
• It is highly specific in the nature 
• It's ireversible in nature 
• It is enthalpy of adsorption is high (approximately 80 —240 KJ mol-¹) 
• It is also depends on the nature of gases  .the gases which can react  with the absorbent show the chemisorptions.
• It is favourable for high temperature 
• Sometime high activation energy is required .
• It results into unimolecular layers