Burning a piece of wood in fire can best be described as a CHEMICAL CHANGE BECAUSE THE ATOMS IN WOOD AND OXYGEN ARE REARRANGED.
In chemistry, there are two types of change, these are chemical and physical changes. In physical change, no new substance is formed and the process is usually reversible. In chemical change, chemical reactions usually occur, new substances are formed and the process is not reversible. Burning of wood in air is a chemical change because the atoms of the wood and the oxygen atoms react together to form new substances and the reaction is not reversible.