Heat packs that contain iron and water packets: Exposing the solution to air results in the oxidation of the iron (creates rust). The oxidation of the iron is an exothermic process. Heat packs that ...

If you take some citric acid solution and combine it with ... when you’ve twisted your ankle. However, exothermic reactions don't always release heat, sometimes the energy is released as light.

But it generates heat, so can be described as exothermic. Although aqueous solutions of 'slaked' lime are alkaline, its solubility in water is so low that the solution would not be a caustic ...