If you are burning a log in the fireplace, what kind of change is the log going through?

Answer 1

When you burn a log in the fireplace, it undergoes a chemical change. During burning, the wood reacts with oxygen in the air in a process called combustion, producing new substances such as carbon dioxide and water vapor, along with heat and light. The original substances (the wood, primarily cellulose and lignin) are transformed into these new substances, indicating a chemical change has occurred. Additionally, physical changes also occur, such as the log reducing in size and forming ash.