Archive
9th of September 2015
Chemistry
Q:

1) is boiling of water to form water vapour a chemical change.why or why not.support your answer with example.

2) how is chemical and physical change both taking place simultaneously in a burning candle.

Mayank Dak - CBSE - Class X

Wednesday, September 09, 2015 at 18:27:PM

A:

1) Boiling of water to form water vapour is a physical change. Over here there is only a change in the state of matter and no chemical change has occured.

2)Melting of wax is a physical change and burning of candle is a chemical change  because heat energy is produced along with water vapour and carbon dioxide.

Wednesday, September 09, 2015 at 18:34:PM