Question

answer in brief

1.why is combustion co considered as a chemical change ?

2.we should not burn coal in aclosed room.why? ​

Answer 1

Answer:

1.Combustion is considered as a chemical change because while combustion a reaction with oxygen takes place and also combustion is an irreversible change.

2.Coal shouldn't be burnt in a closed room as coal is a form of carbon and on burning carbon , it reacts with oxygen and forms Carbon dioxide (CO2) which if inhaled by us can cause problems.

Answer 2

Combustion is a chemical change because new substances with new properties are formed. The original substance can not be got back.

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