Students at a bonfire noticed that a large amount of gas and ash were produced as they watched the logs of wood burn.

Which statement best explains the type of change that occurred as the logs of wood burned?

A.)

A physical change occurred because the atoms in the wood changed from a solid state to a gaseous state as the atoms in the wood burned.

B.)

A chemical change occurred because the atoms in the wood reacted with oxygen and rearranged to form new combinations of atoms and molecules.

C.)

A physical change occurred because the ash and gas produced can easily be turned back into wood.

D.)

A chemical change occurred because a chemical reaction occurs any time heat is added to a substance.