Question

When a candle burns both physical and chemical changes occur Explain in short but with full meaning

Answer 1

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When candle burns, both physical and chemical changes take place

Physical change ➡️ Melting of wax

Chemical change ➡️ Burning of wax

Eating of food is another example where both physical and chemical changes occur simultaneously.

Physical change ➡️ Breaking of larger food particles into smaller particles .

Chemical change ➡️ Digestion of food





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Answer 2

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Answer :



The burning of a candle involves a physical as well as a chemical change .


Reason :


1. The wax under the wick melts . The molten wax flows down and solidifies . These are changes in state and , therefore , physical changes .


2. A part of the molten wax that vaporises burns to form carbon dioxide and water vapour . The burning of wax is a chemical change .



$\bold{physical \: change}$


1. A physical change is temporary .

2. A physical change is reversible .

3. No new substances are formed after a physical change .

4. After a physical change, the mass of the substances remains unaltered .

5. Example : Melting of ice , evaporation of liquid , freezing of water etc .



$\bold{chemical \: change}$



1. A chemical change is permanent .

2. A chemical change is Irreversible .

3. New substances are formed after a chemical change .

4. The mass of the individual substance undergoing a chemical change is altered .

5. Example : Photosynthesis , fermentation , respiration etc .




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