Question

Write example for each of the following
a) change in colour
b) change in temperature
c) Formation of precipitate.

Answer 1

a) $Fe+CuS{O}_4\to FeS{O}_4+Cu$

Here $CuS{O}_4$ is in blue colour and $FeS{O}_4$ is in green colour.

b) When a cup of hot water and a cup of cold water is mixed the temperature resulting gets changed.

c) $AgN{O}_3+KCl\to AgCl+KN{O}_3$

When silver nitrate reacts with KCl, then formation of precipiate takes place.