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Cooling from Evaporation

Explain why b...

Question

Explain why burning of wax is a chemical change

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Solution

Dear Student,

In a chemical change, new subtances are formed and the composition of the substance changes.

The wax acts as a fuel when we light the candle and is basically a chemical substance called carbon. The carbon combines with oxygen to form another chemical substance called carbon dioxide. Also the unburnt carbon is deposited as black substance called soot. This signifies a chemical change.

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Q. When a candle burns, is it possible to get the wax back
(a) after the wax melts?
(b) after the wax burns?
(HINT: Are these phyusical changes or chemical changes?)

Q. Is burning of a substance always a chemical change? Explain how burning of candle involves both physical and chemical change.

Q. Assertion :The burning of a candle is both a physical and a chemical change. Reason: Burning of candle melts the wax and hence physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.

Which of the given statements is correct?

Statement 1: Melting of wax is a physical change as the molten wax can be solidified on cooling.

Statement 2: Burning of wax is a chemical change, as once the wax has been burnt, it cannot be brought back to its original form.

Q. Statement I: The melting of wax is a physical change.
Statement II: The burning of wick for the production of heat and light is a chemical change.

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