Question

Identify physical and chemical changes from the phenomena given in the following table.
1) Transformation of ice into water. 2) Cooking of food.
3) Ripening of fruit.
4) Milk turned into curd.
5) Evaporation of water.
6) Digestion of food in the stomach. 7) Size reduction of naphtha balls exposed to air.
8) Staining of Shahbadi or Kadppa tile by lemon juice.
9) Breaking of a glass object on falling from a height.

Answer 1

1. P

2. C

3. C

4. C

5. P

6. C

7. C

8. P

9. C

Explanation:

Note : P- Physical change

: C - Chemical change

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Answer 2

Physical changes:

1. Transformation of ice into water.

5. Evaporation of water.

7. Size reduction of naphtha balls exposed to air.

9. Breaking of a glass object on falling from a height.

Chemical changes:

2. Cooking of food.

3. Ripening of fruit.

4. Milk turned into curd.

6. Digestion of food in the stomach.

8. Staining of Shahbadi or Kadppa tile by lemon juice.

Explanation:

Physical changes do not involve any change in the chemical composition of a substance. In these changes, the state, size, shape, or appearance of a substance may change. Examples of physical changes from the table include transformation of ice into water, evaporation of water, size reduction of naphtha balls exposed to air, and breaking of a glass object.

Chemical changes, on the other hand, involve a change in the chemical composition of a substance. In these changes, one or more new substances are formed with different chemical properties. Examples of chemical changes from the table include cooking of food, ripening of fruit, milk turning into curd, digestion of food in the stomach, and staining of Shahbadi or Kadppa tile by lemon juice.

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