Question

When water solidifies to ice, heat is:
A. Evolved
B. Absorbed
C. No change
D. Depending on the condition it may be absorbed or evolved.

Answer 1

Hint: Element and compounds in nature exist in various forms, namely solid, liquid, and gaseous. These elements interchange into these forms from one form to another. Water exists in the form of ice, water, and water vapor and all these three states have a different energy. As the energy changes based on the reaction the states of water change.

Complete step by step answer:
Elements and compounds in the environment exist in various states namely solid, liquid, and gas. All these three states have different energies and occur in different conditions. As the energy of the compound changes the state of the compound also changes.
The reactions can also be categorized as exothermic and endothermic based on the energy that is released or absorbed. If the energy is absorbed, it causes the temperature and energy of the surroundings to decrease and thus is called endothermic.
The reactions in which the energy is released are termed as exothermic and cause an increase in the atmospheric temperature.
When the energy changes and the compound changes the state the concept of latent energy comes into play. According to this when the compound changes state it breaks or forms bonds and in this intermediate state the temperature of the reaction doesn’t change and the energy gained by heating goes into the breakage of bonds.
The process of changing the liquid to solid is called freezing. Water freezes to ice due to temperature change and this process releases the extra heat that it has in the previous state.

So, the correct answer is Option A .

Note: Solid-state has the atoms of the structure tightly packed as hence has the lowest energy of the three states and the gaseous state has the most energy and the molecules in this state are the most mobile. The energy of the liquid state lies in between the solid and liquid states.