Question

Chemical changes are___________
A) temporary, reversible and a new substance is produced.
B) irreversible, permanent and a new substance is produced.
C) always accompanied by exchange of light.
D) never accompanied by exchange of light and heat energy. ​

Answer 1

Answer:

(B)

irreversible, permanent and a new substance is produced.

kuki

Chemical changes take place on the molecular level. A chemical change produces a new substance. It is a permanent and irreversible change. Examples of chemical changes include combustion (burning), cooking an egg, rusting of an iron pan, and mixing hydrochloric acid and sodium hydroxide to make salt and water.

Answer 2

Answer:

Chemical changes are

B) irreversible, permanent and a new substance is produced