Question

A newspaper turns yellow in sunlight. Is this a physical or chemical change?

Answer 1

It is a chemical change. I always think of a chemical/physical change as if you could  reverse it back as it started off, for example if you stepped on a can you can reverse the can back probably not exactly like it was before but you can still reverse it so this would be a physical change, and if you baked a pizza you could not reverse the dough and everything else back.