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Burning of candle, digestion of food, melting of a paraffin wax, heat on camphor, drying of white wash, souring of milk, passage of current through copper

metal, passage of current through acidified water, burning of kerosene oil and burning of petroleum gas are physical or chemical changes?


Melting of a paraffin wax, drying of white wash, passage of current through copper and passage of current through acidified water are physical changes.. Rest all are chemical changes.
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Melting of was is a physical changes ....cz its not burning its melting.... So how its a chemical change..can u plzz explain me @ ruhaniC
Plz read my answer again. I have said buring of wax is a phyical change.
Sry @ruhaniC...my mistake:)
Happens :)
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