* Combustion: Burning wood is a process called combustion, which is a rapid chemical reaction between a fuel (wood) and an oxidant (oxygen).

* Chemical Change: The wood undergoes a chemical change, transforming into ash, carbon dioxide, water vapor, and other byproducts. The original wood molecules are broken down, forming new molecules.

* Energy Release: This reaction releases a significant amount of energy in the form of heat and light.

The chemical equation for the simplified combustion of wood can be represented as:

```

Wood (C6H10O5)n + Oxygen (O2) → Carbon Dioxide (CO2) + Water (H2O) + Heat + Light

```

Key points:

* The chemical bonds in wood are broken, and new ones are formed in the products.

* The process involves a change in the chemical composition of the wood.

* The reaction requires an activation energy (heat) to initiate.

So, while wood burning seems like a physical change, it is fundamentally a chemical reaction because it involves a change in the chemical composition of the wood.