NCERT Question 7 - Chapter 6 Class 7 - Physical and Chemical Changes

Last updated at December 13, 2024 by

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

 

Answer:  

  • When we burn wood, new substances, coal and smoke , are formed. 
  • Further, burning of wood is irreversible , and the chemical composition of wood changes .
  • Therefore, it is a chemical change .
  • But, when we cut wood, only the shape and size of the wood are changed . 
  • No new substance is formed. 
  • Therefore, it is a physical change .
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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo