why heating of a napthelene is a physical change
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As the naphthalene is heated, heat energy is converted to kinetic energy. Kinetic energy increases and the molecules vibrate faster about their fixed positions and the temperature increases. Naphthalene is in solid state at any temperature below its melting point.
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It's a physical change, because there is no chemical reaction involved. Naphtalene's temperature is risen and it eventually sublimates, but, it's chemical composition remains the same. If you cool it back down, you'll obtain the same compund.
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