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Shobha Tripathi
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Shobha Tripathi
Asked: September 16, 20212021-09-16T09:17:46+00:00 2021-09-16T09:17:46+00:00In: 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.

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      Uma sanker
      2021-09-16T12:42:00+00:00Added 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 because the gas on burning produces carbon dioxide gas and gives light and heat

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