Question

During which change is heat energy absorbed

Answer 1

Answer: In Endothermic reaction heat energy is absorbed. It is absorbed by the system from the surroundings.

Explanation: In any physical or chemical reaction, when heat is absorbed by the system then temperature of its surrounding is decreases, then this type of reaction are called as endothermic reaction.

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Answer 2

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Your question: During which change is heat energy absorbed

My Answer: Change of phase

More Details:

A phase change is a physical process in which a substance goes from one phase to another. Usually the change occurs when adding or removing heat at a particular temperature, known as the melting point or the boiling point of the substance.

However, If we are talking about which phase change is heat energy absorbed by a substance, then your answer would be Evaporation:

The process of converting a liquid to a gas is called evaporation. 600 cal is needed to convert 1g of water to water vapor at 0 °C or 540 cal at 100 °C.

The thermal energy absorbed by the molecules of a liquid during evaporation is used only to give them the movement needed to escape from the liquid's surface and become a gas. This energy, which is later released as heat when the vapor is liquid again, is called latent heat of vaporization.