How can we say that burning of candle is a chemical change but the glowing of bulb is a physical change
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During burning of candle new substances like carbon dioxide gas and water vapour are produced, hence it is a chemical change as well. Glowing of an electric bulb is a physical change since no new substance with different properties is formed.
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When candle burns, combustion happens at the wick. Combustion means a chemical reaction, so a chemical change.
When the bulb glows, current passes through the filament. This heats the filament and makes it glow. Since there is no change in chemical composition it is a physical change.
When the bulb glows, current passes through the filament. This heats the filament and makes it glow. Since there is no change in chemical composition it is a physical change.
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