Question

5. How is boiling an endothermic change?​

Answer 1

Answer:

Boiling is an endothermic reaction or process as heat is being supplied to and absorbed by the liquid system being boiled

Explanation:

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Answer 2

Answer:

Boiling, or the transition from liquid to gas, is a physical change that results in a change of energy in the substance being boiled. If you think about "boiling" from a kinetic molecular theory standpoint, energy in the molecules/atoms must change in order to go from a liquid state to a gaseous state. A change in matter from one physical state to another requires either the input or output of energy often in the form of heat, or thermal, energy. Many physical or chemical processes require such changes in thermal energy. The process is deemed exothermic if it gives off heat and endothermic if it takes in heat. Whether it takes in or gives off is related to the final physical state and randomness of the molecules/atoms.