Match the following: 1. Turning of milk into curd (a) Desirable change 2. Change of seasons (b) Chemical change 3. Change in length (c) Slow change 4. Swinging of pendulum (d) Heating 5. Blooming of flowers (e) Periodic change

1-b Turning of milk into curd is a chemical change. Milk has a different composition than curd. This change is a permanent and an irreversible change. 2-c Revolution of the Earth on its tilted axis around the sun causes the change in seasons. Change of seasons is a slow change. 3-d Change in length is due to heating. Because, heating causes expansion of metals. 4-e Swinging of pendulum is a periodic change because they change regularly with time. 5-a Blooming of flowers is a desirable change. As everyone loves flowers. On fertilisation, flowers turn into fruits which have seeds in them. Column A Column B 1. Turning of milk into curd (b) Chemical change 2. Change of seasons (c) Slow change 3. Change in length (d) Heating 4. Swinging of pendulum (e) Periodic change 5. Blooming of flowers (a) Desirable change

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Ripening of fruit is a change taking place around us.

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Important Questions on Physical and Chemical Changes

MEDIUM

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Useful substance in preparation of freezing mixture is

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

All the changes are undesirable.

HARD

Science>Chemistry>Physical and Chemical Changes>Physical Changes

On cold chilly day Rakesh tried to open the metallic cap of an ink bottle. He found that metallic cap is struck. His mother told him to pour hot water on it. He poured hot water on the cap for a minute. He again tried to open the metallic cap. Now the metallic cap opened easily. He surprised and asked his observation to his elder brother Samir. Being a student of science Samir explained such things properly.
Answer the following questions based on above information :
(i) What are the values displayed by Samir?
(ii) Why was it easy to open metallic cap when warmed with water?
(iii) What kind of change does take place in the cap of bottle and why?

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Science>Chemistry>Physical and Chemical Changes>Physical Changes

Which of the following cause(s) change?

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Science>Chemistry>Physical and Chemical Changes>Physical Changes

The term change means to become _____. (similar / different)

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Science>Chemistry>Physical and Chemical Changes>Physical Changes

Give two examples of periodic change.

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Science>Chemistry>Physical and Chemical Changes>Physical Changes

Match the following:

1. Turning of milk into curd	(a) Desirable change
2. Change of seasons	(b) Chemical change
3. Change in length	(c) Slow change
4. Swinging of pendulum	(d) Heating
5. Blooming of flowers	(e) Periodic change