When copper oxide (CuO) is heated in a test tube with carbon (C), the following reaction occurs:

2CuO + C → 2Cu + CO₂

Here's what happens:

* Reduction: Carbon acts as a reducing agent. It takes oxygen from the copper oxide, leaving behind pure copper.

* Oxidation: Carbon gets oxidized, forming carbon dioxide (CO₂).

So, the products formed are:

* Copper (Cu): A reddish-brown solid metal.

* Carbon dioxide (CO₂): A colorless gas.

This reaction is a classic example of a reduction-oxidation (redox) reaction, where one substance gains electrons (reduction) and another loses electrons (oxidation).