Oxygen, as Oxidation is the very definition of "burning".
Yes, anything that burns (combust) is a chemical change
you can smoke just about anything that burns.
Something that burns or is flammable would be a chemical change.
A fire burns.
There is Chemical, heat, and electrical burns.
Chemical
Chemical change
yes 3rd degree chemical burns
Chemical change
Flammability is a chemical property.
Chemical burns may be prevented by wearing protective clothing, including gloves and eyeshields.
Chemical change-- a new substance is formed.