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Burning wood is a chemical reaction because combustion (burning) is an oxidation reaction.
Burning cotton smells like burning paper because it is extracted from plant same as the paper.
Burning wool smells like burning hair because it is extracted from animals like sheep etc. and is actually the hair of the animal.
if you pee and then have a burning sensation it normally means you have a bladder infection
Burning is a chemical change but water doesn't burn.
Have some burning bushes dying while others are doing great. Why?