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  1. Asked: September 16, 2021In: Class 7 Science

    When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

    Uma sanker
    Added an answer on September 16, 2021 at 12:42 pm

    1 (a) Melting of wax during burning of a candle is a physical change. (b) Burning of wax and thread is a chemical change. 2. The use of LPG also involves two changes: (a) When the valve is opened, the liquid LPG gets vaporised. This is a physical change. (b) The burning of LPG is a chemical change bRead more

    1 (a) Melting of wax during burning of a candle is a physical change.
    (b) Burning of wax and thread is a chemical change.
    2. The use of LPG also involves two changes:
    (a) When the valve is opened, the liquid LPG gets vaporised. This is a physical change.
    (b) The burning of LPG is a chemical change because the gas on burning produces carbon dioxide gas and gives light and heat

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