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Condensation

Burning of a ...

Question

Burning of a matchstick
Changing of seasons
Souring of milk
Digestion of food
Blinking of eyes
Melting of ice
Cooking of food
Growing of seedling
Ploughing of field
Ripening of fruits
Reversible changes or irreversible changes??

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Solution

1) Burning of matchstick : Irreversible change
2) Changing of season : Reversible
3) Souring of milk : Irreversible
4) Digestion of food : Irreversible
5) Blinking of eyes : Reversible
6) Melting of ice : Reversible
7) Cooking of food : Irreversible
8) Growing of seedling : Irreversible
9) Ripening of fruits : Irreversible

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Similar questions

Q. Categorise these changes as reversible or irreversible.
a. Melting of an ice candy
b. Cooking of food
c. Souring of milk

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Digestion of food is a Q irreversible change. ( )
2. Rusting of iron is a reversible change. ( )
3. Melting of wax is a reversible change. ( )
4. Curding of milk is an irreversible change. ( )
5. Melting of ice cream is a reversible change. ( )

Q. Fill in the blanks with the correct words.
1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
4. Breaking of glass is a .................... (physical/chemical) change.
5. .................... (Heating/Cooling) causes steam to change into water.

Q. (a) Differentiate between physical and chemical changes.
(b) Give reasons:
(i) Ripening of fruit is a desirable change.
(ii) Curdling of milk is a slow change.
(ii) Digestion of food is an irreversible change.

Q. Classify the following as slow or fast change:
(i) Bearing of heat
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curdling of milk
(x) Formation of day and night.

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