Question

reversible change.
(d) Burning of a matchstick is a physical change.
le) Water cycle in nature is an irreversible change.
Rewrite the statements correctly by changing the underlined words.
(a) Tearing of paper is a chemical change.
(b) Metals contract on heating.​

Answer 1

Answer:

Question given:

Rewrite the statements correctly by changing the underlined words.

(a) Tearing of paper is a chemical change.

(b) Metals contract on heating.

Answer:

a)Tearing of paper is a Physical Change.

$\sf\underline\red{Reason:-}$

As after tearing the paper no new substance is formed. So we can say that tearing paper is not a Physical Change.

Answer:

b)Metals expands on heating.

$\sf\underline\red{Reason:-}$

That is False that Metals contract on heating.

It is a well known property.

If the metal tries to expand inwards ,it will compress itself, and increase its density.Therefore on heating the metals expands.

Answer 2

Rewrite the statements correctly by changing the underlined words.

(a) Tearing of paper is a chemical change.

➜ Tearing of paper is a Physical Change.

(b) Metals contract on heating.

➜ Metals expands on heating.

(d) Burning of a matchstick is a chemical change.

➜Burning of a matchstick is a physical change

e) Water cycle in nature is an irreversible change.

➜Water cycle in nature is an reversible change