Question

3. Water cycle is a natural change. Classify it as a (i) physical or chemical change
(ii) a reversible or irreversible change. Also, justify your answer.
4. How can we say that burning of candle is a chemical change but the glowing
of bulb is a physical change?​

Answer 1

Answer:

your answer is here:-

Explanation:

3(i) it is a physical change because in whole process of water cycle only form of water change not the chemical structure of water.

ice - water - water vapour -water(liquid)- ice

(ii) it is reversible change because in the water cycle the ice change into water and water change into vapour and again through rain water vapour change into water and after decreasing of temperature it change into ice .

4 burning of candle is a chemical change because after burning it change into light energy , and glowing of bulb is a physical change because in bulb due to electricity the the temperature rise and the element start radiating and after stoping the electricity the bulb stop glowing.

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