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Science Test Space
Class 8
Matter around us
Textbook questions
8.
Answer very briefly I
Question:
4
m.
1.
Diffentiate between absorption and adsorption.
Absorpti
on:
Absorption is an endothermic process.
It is surface phenomenon, i.e. it occurs only at the surface of the adsorbent.
Adsorption is an exothermic process.
It is bulk phenomenon, i.e., occurs throughout the body of the material.
Absorption is an endothermic process.
Adsorption is an exothermic process.
It is bulk phenomenon, i.e., occurs throughout the body of the material.
It is surface phenomenon, i.e. it occurs only at the surface of the adsorbent.
Adsorpti
on:
It is surface phenomenon, i.e. it occurs only at the surface of the adsorbent.
It is bulk phenomenon, i.e., occurs throughout the body of the material.
Adsorption is an exothermic process.
Absorption is an endothermic process.
It is surface phenomenon, i.e. it occurs only at the surface of the adsorbent.
Absorption is an endothermic process.
Adsorption is an exothermic process.
It is bulk phenomenon, i.e., occurs throughout the body of the material.
2.
Define Sublimation.
The conversion of a
molecules
substance
elements
atoms
from the
solid to the solid
solid to the liquid
solid to the vapour
solid to the gaseous
state without becoming liquid is called sublimation.
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