Question

why burning candle is both physical and chemical change

Answer 1

burning candle is physical change as the melted wax can be collected and new candle can be made.
burning candle is chemical change as the rope in between gets burned.
I hope my answer helps you.

Answer 2

because melting of wax is physical change and burning of wick in the candle is chemical change as we can use again wax but cannot wick