Which of the following r chemical change?Why?
1.Biogas is produced by decomposition of plant and animal waste by anaerobic bacteria
2. Biogas is burned as fuel

Dear user,Chemical Change :Chemical change is,as the name suggests change in the chemical stateor change in chemical composition or formation of a totally newsubstance from an existing compound.Talking in terms of molecula,it isactually formation or breakdown of bonds between atoms. For example:rusting of iron gasoline burning (water vapor and carbon dioxide form),biogas(breakdown of biodegradable waste).Therefore both are chemical change.

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IS THE CHEMICAL CHANGE
 
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