Question

When solid NH₄NO₃ is dissolved in water, the temperature of the water and beaker gets noticeably colder. The formation of an aqueous solution of ammonium nitrate is:

a) An exothermic process.
b) An endothermic process.
c) A combustion reaction.
d) A thermodynamic cycle.
e) A redox reaction.

Answer 1

The dissolution of solid ammonium nitrate in water, which results in a decrease in temperature, is an endothermic process as it absorbs heat from the surroundings. The correct answer is b) An endothermic process.

Step-by-step explanation:

When solid ammonium nitrate (NH4NO3) is dissolved in water and the temperature of the solution decreases, this is indicative of an endothermic process. An endothermic process is one that absorbs heat from its surroundings, as is the case with ammonium nitrate which is used in instant cold packs for treating injuries.

These packs work by absorbing heat, thereby providing a cold compress that helps to decrease swelling. The absorption of heat by the solute from the water and beaker causes the temperature to drop, making the dissolution of ammonium nitrate in water an endothermic reaction.

When solid NH4NO3 is dissolved in water, the temperature of the water and beaker gets noticeably colder. This is because the dissolution of ammonium nitrate in water is an endothermic process. In this process, heat is absorbed from the surroundings, resulting in a decrease in temperature.