When copper (II) chloride (CuCl₂) and aluminum (Al) are combined, they undergo a single displacement reaction, resulting in the formation of aluminum chloride (AlCl₃) and copper (Cu).

Here's the balanced chemical equation:

3CuCl₂ + 2Al → 2AlCl₃ + 3Cu

Explanation:

* Aluminum is more reactive than copper, meaning it can displace copper from its compound.

* The aluminum atoms lose electrons and become Al³⁺ ions, while copper ions (Cu²⁺) gain electrons and become copper atoms.

* The reaction is exothermic, meaning it releases heat.

Observations:

* You would observe a reddish-brown solid (copper) forming on the surface of the aluminum.

* The solution would turn colorless if the copper (II) chloride was initially dissolved in water.

Note: This reaction is often used in demonstrations as a visual example of single displacement reactions.