The reaction of iron and copper chloride occurs because of a single displacement reaction driven by the difference in reactivity between the two metals.

Here's the breakdown:

* Iron (Fe) is more reactive than Copper (Cu). This means iron has a stronger tendency to lose electrons and form positive ions.

* Copper chloride (CuCl₂) contains copper ions (Cu²⁺).

* When iron is added to a copper chloride solution, the more reactive iron displaces the less reactive copper. Iron atoms lose electrons, forming iron(II) ions (Fe²⁺), and the copper ions gain electrons to become copper atoms (Cu).

This is represented by the following chemical equation:

Fe(s) + CuCl₂(aq) → FeCl₂(aq) + Cu(s)

Key points:

* The reaction is spontaneous because it releases energy (exothermic).

* You will observe a reddish-brown solid (copper) forming on the surface of the iron as the reaction progresses. The solution will also change color as the iron chloride forms.

This reaction is a classic example of how reactivity series can be used to predict the outcome of chemical reactions.