Question

melting, boiling, and bending are considered physical changes, but burning is a chemical change. explain why this is so.

Answer 1

So, when you make something boiling or melting, it's still the same substance. Water don't change into something else, just change it's state of matter. When you burn something, one substance reacts with another. For example, when you burn carbon in oxygen, you get carbon dioxide. That's the difference.