The oxidation of the iron is an exothermic process. Heat packs that contain supersaturated sodium acetate: These are reusable, the packs are boiled to dissolve sodium acetate. Inside is a metal ...

Two dry solids --- barium hydroxide and ammonium nitrate --- are mixed to produce an endothermic reaction. The temperature of the mixture drops approximately 45oC and is cold enough to freeze the ...

The equation for this is: Note that the removal of water from hydrated copper(II) sulfate requires heat, and so is an endothermic process. The reverse process (the addition of water to anhydrous ...

For AQA GCSE Combined Science, the specifics of the Haber process don't need to be known ... the position of equilibrium moves in the endothermic direction to reduce the temperature.