Question

(d) changing of water into water vapour
7. Which of these is an irreversible change?
(a) burning of a matchstick
(b) inflating tyres
(C) lighting a bulb
(d) inflating a balloon
8. Most chemical changes are
(a) reversible
(b) temporary
(c) irreversible (d) heat absorber​

Answer 1

Answer:

7. (a) burning of a matchstick

8.(c) irreversible

Explanation:

burning of a matchstick is an irreversible change because once a matchstick is burnt , it cannot be used again.

Answer 2

Answer:

A) burning of matchstick

C) IRREVERSIBLE