Which of the following is a chemical change?
melting of wax
addition of salt to water
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Melting of wax is a chemical as well as a physical change.
In a burning candle, there are both physical and chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.
In a burning candle, there are both physical and chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.
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Explanation:
ADDITION OF SALT AND WATER
Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed. Physical change can obtained be reversed. Allowing the water to evacuate will return the salt to a solid state.
MELTING OF WAX
Melting of wax is a temporary and wax can settle again the on cooling and turns into a solid. Hence, the change is only physical and the state of matter changes. Burning of the candle is permanent because once it is burn it cannot be converted into the candle.
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