Physical VS Chemical!
Properties and Changes
Carving wood (Why? Because the wood can now be a sculpture, but it is still wood)
Cutting paper (Why? Because the paper can be in more pieces, but it is still paper)
Burning a flammable item (Why? Because the item is now turned into ashes, not like regular)
Digesting Food (Why? Because for example, let's say you are eating an apple. When you chew the apple, it is still an apple! But when the apple goes through your stomach, it is not an apple anymore.)
(Why all these? Because you are observing the items characteristics and ways, but you aren't adding another substance.)
(Why all these? Because you are observing the characteristic and seeing the results, then you will compare the to the substance.)