how can we say that Burning of candle is a chemical changes but the glowing of bulb is a physical changes
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bcz burning of a candle z an irreversible change while glowing of a bulb z reversible.
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very good ques .....
actually On burning candle, wax melts which is a physical change. Also, the wax near the flame burns and gives CO2, soot, light and heat which is a chemical change. Hence, burning of candle is a physical as well as chemical change....
glowing of a bulb is a physical change because when u switch it on it glows and again if u switch it off it comes back to initial state. so it is reversible ...
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