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Evaporation

Classify risi...

Question

Classify rising of hot air over a radiator as a physical or a chemical change. Give reasons.

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Solution

Rising of hot air over a radiator is a physical change. Water in a radiator converts to vapours. Hot air becomes lighter and rises.

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Q. Question 38
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change in the colour of black tea on adding lemon juke to it.
(e) Churning of milk cream to get butter.

Rising of hot air over a radiator is a chemical or physical change? Give reason.

Q. Question 38
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change in the colour of black tea on adding lemon juke to it.
(e) Churning of milk cream to get butter.

CLASSIFY THE FOLLOWING AS PHYSICAL OR CHEMICAL CHANGES.GIVE REASONS FOR YOUR ANSWERS:

a.CUSTARD BEING PREPARED

b.CARBON BURNING IN AIR TO GIVE CARBON DIOXIDE.

c.BURNING OF PETROL.

Q. Classify the following change as chemical or physical
a) When a spider's saliva is used to make its web
Give reason also

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