Enthalpy H - is the heat content that is stored in a chemical system
Exothermic - refers to a reaction in which the enthalpy of the products is smaller than the enthalpy of the reactant; resulting in heat loss to the surroundings
Negative enthalpy change!
eg Self heating cans, Oxidation of fuels, Respiration
Endothermic - refers to a reaction in which the enthalpy of the proudcts is greater than the enthalpy of the reactant; resulting in heat being took in from the surroundings,
Postive enthalpy change!
eg Self cooling cans, Thermal decompostion of limestone, Photosysthensis
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