Question

Melting of ice is an example of:
A.Exothermic reaction
B.Endothermic reaction
C.Chemical Combination
D.Chemical Decomposition

Answer 1

Hint: When ice melts it converts into water. A change in the phase of the ice occurs from solid to liquid. In solid the molecules are held together with a strong force of attraction. When the phase of ice changes to liquid, the intramolecular forces of attraction weaken. To make the phase change energy is absorbed by the system.

Complete answer:
The melting of ice is the process in which the ice transforms into water at a certain temperature. The change takes place only when the ice absorbs the heat from the surrounding. Without heat, the phase change cannot occur. The absorbance of heat weakens the force holding the molecules together.
We know that when heat is absorbed during a reaction it is called an Endothermic reaction and when heat is evolved it is termed an Exothermic reaction.
The melting of ice absorbs heat, so it is an example of an Endothermic reaction.
Melting of an is a non-spontaneous reaction and very likely takes place only if the temperature of the system rises. The presence of heat can facilitate the reaction.
Final answer: The correct answer is Option B: Endothermic reaction

Note:
In an endothermic reaction, the internal energy of the reactant increases as it absorbs heat. Remember that the Melting of ice is an isothermal process because the temperature of the system remains constant. It is not an adiabatic process since, $q\text{ }\ne \text{ 0}$ and heat exchange occurs. Also, during an endothermic reaction, the enthalpy change is positive which can be used to define the type of reaction.