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

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

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