Exothermic and Endothermic Reactions

Endothermic: a reaction that takes in energy from the surroundings to the reacting chemicals e.g  ice packs, combustion

Exothermic: a reaction that gives out energy from the reacting chemicals to the surroundings e.g handwarmers, respiration, neutralisation

Handwarmers 

 Used only once: uses oxidation of iron to release energy. Iron turns to hydrated iron…