Question

Rick the correct option:
which of the following are chemical changes ?
1.growth of the plant
2.cooking of food
3.freezing of water
4.rusting of iron ​

Answer 1

Answer:

freezing of water is not a chemical changes

other three are chemical changes

Answer 2

Answer :-

• Chemical Changes are those changes in which new substance is formed .

• Physical changes are those changes in which no new substance is formed only state of that substance is changed.

1) Growth of the plants :-

Here,

Growth of substance is chemical change because When plants grows it only changes its shape, size and etc but the chemical changes occurs inside the plants not outside which is responsible for the growth but no new substance is formed.

2) Cooking of food :-

Here,

Cooking of food is a chemical change because before cooking the food we arrange many items and when we mix up all and cooking it then new substance is formed that is the new dish.

3) Freezing of water :-

Here,

Freezing of water is a physical change because before freezing the water the water is in liquid form but when we freeze it. It changes into Ice in this only state of water is change but no new substance is formed.

4) Rusting of iron :-

Here,

Rusting of iron is a chemical change because to form rust iron is mixed with oxygen and this reaction is called Rusting.

Hence, Option 2 , 3 and 4 are correct option $.$