EVERYDAY SCIENCE

SCIENCE

CHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which is a physical change?
A
burning coal
B
tearing paper
C
digesting food
D
iron rusting
Explanation: 

Detailed explanation-1: -When we tear a piece of paper, we can see that the chemical content remains the same; only one thing that’s changed is the size of the paper bits that form as we tear the paper further. Its physical state has changed. As a result, tearing a piece of paper is an irreversible physical change.

Detailed explanation-2: -Tearing of paper is a physical change that cannot be reversed because there is no alteration in the chemical composition of paper.

Detailed explanation-3: -Tearing is the act of breaking apart a material by force, without the aid of a cutting tool. A tear in a piece of paper, fabric, or some other similar object may be the result of the intentional effort with one’s bare hands, or be accidental.

Detailed explanation-4: -Physical Changes. A physical change is when a substance changes, but remains the same substance. Change in size. If a piece of paper is cut into two pieces, the paper becomes smaller, but still remains as paper. Change in shape.

Detailed explanation-5: -The changes in which only physical properties of substances are changed and no new substance is formed is called a physical change. It is a reversible change. Example: Boiling and freezing of water.

There is 1 question to complete.