Is burning a candle a physical or chemical reaction. Also dissolving NaCl, mixing NaCl and AgNO3?

Question

Also, tearing Mg ribbon, adding HCl to Mg, grinding CuSO4 + 5H20,
heating CuSO4 + 5H20, and mixing NaHCO3 + vinegar

Answer 1

The wax that actually burns is a chemical reaction (rapid oxidation). Some wax simply melts and drips down the candle. That's a physical change.

Tearing, grinding, heating, and dissolving are physical changes.

HCl+Mg, NaHCO2+vinegar, and NaCl+AgNO3 are chemical reactions.

Answer 2

Chemical. But if you look closer (quantum level, superstrings, etc.), it's also physical.