Question

What happens to the wax ? Activity 4.6 class 7

Answer 1

Answer:

The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapor (H2O) and carbon dioxide (CO2).

Answer 2

Happens to the wax

• Carbon and hydrogen combine to form wax. When a candle burns, the oxygen in the air and the hydrogen and carbon from the wax mix to form carbon dioxide and water vapour. These two gases make up the majority of the material in the candle.
• Actually, the wax rises as it begins to melt and pool around the cotton wick of the candle. It is absorbed by the wick, burns, and finally evaporates into the air as either carbon dioxide or water vapour.
• Wax melts when it is heated. Wax is solid before melting, and when it is heated, it becomes liquid.
• The molten wax soaks up or is absorbed by the wick. The molten wax in the wick is vaporised by the heat of the flame. The flame burns the wax vapours. This procedure continues until all the wax has been used up or the candle has burned out.
• Wax melting on its own results in a transformation from a solid to a liquid. No new products are produced when a substance's physical state changes. When a candle burns, the wax progressively melts and eventually freezes (Physical change) Wax melting is a physical change as a result.

#SPJ2