What is the difference between a physical change and a chemical change

A physical change in something doesn't change what the it is. For example, if you break glass, it will still be glass. In a chemical change where there is a chemical reaction, a new thing is formed and energy is either given off or absorbed. For example, when you burn a log. The carbon in the log is reacting to the oxygen to create ashe and smoke

physical rearranges molecules but doesn't affect their internal structures while chemical is any change that results in the formation of new chemical substances