A student dissolves ammonium nitrate in water and measures the temperature. The temperature drops from 22 °C to 14 °C. What type of reaction is this and why?

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Question

A student dissolves ammonium nitrate in water and measures the temperature. The temperature drops from 22 °C to 14 °C. What type of reaction is this and why?

Accepted Answer

Endothermic, because energy was transferred from the surroundings to the reaction — The temperature falling from 22 °C to 14 °C is a drop of 8 °C, which shows the solution lost energy to the dissolving process. A falling temperature never indicates an exothermic change, and the fact that dissolving occurred says nothing on its own about the direction of the energy transfer.

Answer

Exothermic, because the temperature of the solution decreased

Answer

Endothermic, because the dissolving produced a new substance

Answer

Exothermic, because energy was released from the surroundings

Answer

Endothermic, because energy was transferred from the surroundings to the reaction

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