Question

(1)
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.​

(a) What changes do you expect?

(2)
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.​

(b) Are these changes chemical in nature?

(3)
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.​

(c) Write a word equation for the chemical change, if any.

Answer 1

(1)
Blue colour of the solution turns to green due to formation of Iron sulphate $\left(FeS{O}_4\right)$
$\text{Iron (Fe)}+CuS{O}_4\text{(blue)}\to$
$FeS{O}_4\text{(greenish)+Copper (Cu)}$

(2)

The changes are chemical in nature because:​

• Formation of new substances like iron sulphate and copper by change in the chemical compositions of iron and copper sulphate respectively.
  $\text{Iron (Fe)}+CuS{O}_4\text{(blue)}\to$
  $FeS{O}_4\text{(greenish)+Copper (Cu)}$

(3)

Iron displaces copper from copper sulphate solution to give iron sulphate and copper.​

​Word equation for the chemical change:
$\text{Iron (Fe)}+CuS{O}_4\text{(blue)}\to$
$FeS{O}_4\text{(greenish)+Copper (Cu)}$