Ammonium Nitrate is a highly significant inorganic chemical compound. It is a white crystalline solid that is highly soluble in water and is extensively used in agriculture worldwide.
It is an endothermic compound when dissolved in water (it makes the water cold).
Improper storage of large quantities can lead to massive accidental explosions.
It is solid at room temperature.
The chemical formula for Ammonium Nitrate is $NH_4NO_3$. It is an ionic salt composed of two polyatomic ions:
The process of dissolving it breaks its ionic bonds, which absorbs heat energy from the surrounding water, making it an endothermic reaction. This is how instant cold packs work.
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