011-40705070  or  
Call me
Download our Mobile App
Select Board & Class
  • Select Board
  • Select Class
 

Burning of candle is physical change or chemical change

Asked by Jassimrat Kaur(student) , on 28/9/11


Become Expert
Score more in Science
Start Now with Video Lessons, Sample Papers, Revision Notes & more for Class-VI - CBSE 

EXPERT ANSWER
Hi,
 
Burning of candle is both physical and chemical change. Burning of candle melts the wax and hence physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.
Thus both the changes are accompanied in the burning of candle.
 

Posted by Prerna Bansal(MeritNation Expert)on 29/9/11

This conversation is already closed by Expert

More Answers

it is physical change. because after the candle is burnt new material is not formed

Posted by Sakshi Ragit(student)on 28/9/11

As we know
Chemical Change- is when something can not be changed back to its normal self
Physical Change- is when it can turn back in to its normal self

So burning of candle is involves both physical and chemical changes.
The wick is burnt, so by definition involves a chemical change. Specifically, this is the reaction of the fibre and oxygen in the air forming carbon oxides and water.
And the physical changes are the wax being melted and some of it vapourised; the same chemical change as above also takes place, as some of this vapour is burnt along with the wick.

In other way : you can say the wax has to be vapourised in order to react with oxygen. The wick is just there to soak up the melting wax and lift it up to reach the oxygen.
The flame is above the top of the candle: the vapourised wax is what is burning.

Posted by Mukesh Kumar Ro...(student)on 28/9/11

 it is both chemical as well as physical change as

  • burning is a chemical change always
  • change in the state of wax is a physical change...

thumbzz up plzzz

Posted by Bebo Miracle(student)on 28/9/11

The physical changes in the candle is that the wax melts, then freezes back into solid state again, and the chemical changes are that the wick burns, soot, and smoke. water vapor and carbon dioxide are formed. and When the wax burns, and the wax combines with the oxygen to form CO2, carbon monoxide, carbon particles (incomplete burning/oxidation) and water. After it burns, you can 't get the wax back.

hence it is both physical and a chemical change
 

Posted by thecoolhermoini...(student)on 28/9/11

 Burning a candle involves both physical and chemical changes. 

The wick is burnt, so by definition involves a chemical change. Specifically, this is the reaction of the fibre and oxygen in the air forming carbon oxides and water. 
The physical changes are the wax being melted and some of it vapourised; the same chemical change as above also takes place, as some of this vapour is burnt along with the wick.
New answer: the wax has to be vapourised in order to react with oxygen. The wick is just there to soak up the melting wax and lift it up to reach the oxygen. The flame is above the top of the candle: the vapourised wax is what is burning.
Chemical Change- is when something can not be changed back to its normal self 
Physical Change- is when it can turn back in to its normal self
 




Posted by Angel Sharma(student)on 28/9/11

Hi!

As all told it is both physical and chemical change.

Cheers!

Posted by Nandhiga Ramani(student)on 30/9/11

Ask a QuestionHave a doubt? Ask our expert and get quick answers.
Show me more questions

close