Question

Process that cause the materials to change like candle

Answer 1

Answer:

When the candle burns,

wax ⟶CO2+ heat + light (vapours)

This is a chemical change, it can't be reversed. Whereas, melting of wax is a physical change.

wax(e)⇌wax(solid)

When cooling is done, the wax solidifies again.

Another example is LPG (which contains butane) the compressed liquid is converted to the gaseous state since this is the change in the state of the substance, it is a physical change. Whereas the burning of gas is a chemical change as it can't be reversed back.

LPG ⟶CO2+ heat.

Explanation:

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