Question

(3) To show that change noticed on putting an iron nail in coppe
VIKAS SCIENCE WORKBOOK : STANDARD 7
66
sulphate solution is a chemical change.
Beaker
Copper sulphate
solution
(Blue colour)
Iron sulphate
solution
(Green colour)
Iron nail
(Brown colour)
Iron nail
(a) Initial state
(b) Final state​

Answer 1

Explanation:

When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. The acetone, petrol or perfume take this latent heat of vaporisation from our palm.

Answer 2

Answer:

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