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Evaporation

Rising of hot...

Question

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

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Solution

It is a physical change when water is evaporating to form hot air vapors over the radiator as no new chemical or substance is formed.

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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.

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.

Q. Burning of LPG is considered as both physical and chemical change .Give reason.

Q. (a) Give the main difference between physical changes and chemical changes.
(b) Which of the following are chemical changes and which physical ? Give reason.
(i) a glass bottle breaking
(ii) coal burning in air
(iii) making a cake
(iv) wool being knitted into a sweater

Is clotting of blood physical or chemical change? (with reason)

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