Alarge white and gray log that smells like pine is burned in a fire pit. after being completely burned, all that remains of the log is a small pile of soft white-gray ashes that no longer smell of pine. describe the evidence that a chemical change has occurred.

A chemical change has occurred because the wood has turned into a substance that can't be changed back to it's original form. The wood has turned to ash, chemical changes are non reversible.

While the pile of ashes and log have similar colors, the change in size, odor, and hardness, and the difference in combustibility indicate that a chemical change has resulted in a substance with a different identity. Furthermore, the ashes cannot be converted back into a log.