Class 7
Chapter 6 Class 7 - Physical and Chemical Changes
  • The process of obtaining crystals of pure substances from their solutions is called crystallisation. 
  • It is the process used to obtain salt from seawater .
  • It is a physical change. No new substance is formed.

For example- 

Copper Sulphate crystals can be obtained from the solution of pure Copper Sulphate .

This solution is also known as blue vitriol .

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo