Question

4. Give two examples where burning of a substance is an undesirable change.

Answer 1

Part 1: Undesirable change:

• Undesirable changes are the changes that we do not want to occur and cause harm to our environment.
• Souring of milk is an example of undesirable change.

Part 2: Examples where the burning of a substance is an undesirable change:

• The burning of fossil fuels produces harmful gases which pollute the environment
• Bursting of crackers is also an example of undesirable change