Question

Name the change in the following examples. 1.Bursting of cracker. 2.conversion of milk into yoghurt. 3.stretching of spring.​

Answer 1

Answer:

1. Chemical
2. Physical
3. Chemical
4. Physical

Answer 2

hey mate !

Before answering these questions you must know that what a physical and chemical change is .

A change which is reversible and in which no new substance is formed is called a Physical change.

A change which is irreversible and in which a new substance is formed is called a Chemical change..

Explanation:

1. Whenever something is burnt it's a chemical change because it couldn't be reversed and a new substance is formed.

Busting of crackers is a chemical change because in this process the cracker cannot be reversed in its original form, and also a new substance, ash is formed .

2. Have you ever heard the hindi phrase

" fata hoa doodh kabhi silta nahi dobara"

means milk converted into yogurt cannot be made milk again. Means it's too a chemical change. The new substance formed here is yogurt

3. Stretching of spring is a reversible change because as soon as you leave the spring it will be converted in its original size, and also there is no new substance formed . Means it's a physical change.

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