- The Heat of Reaction is the heat absorbed in a reaction at standard state condition between the numbers of moles of reactants shown in the equation for the reaction.
- The Heat of reaction is represented by the symbol ∆H.
- The unit of ∆H is kJmol-1.
- If the reaction is exothernic, ∆H shows a value of negative. If the reaction is endothernic, ∆H shows a value of positive.
- The 4 heat of reaction that you need to know in the syllabus
- Heat of Precipitation
The heat of precipitation of a substance is the heat change when 1 mole of precipitate formed from its solution of ion under standard state condition.
- Heat of Displacement
The Heat of Displacement of an element is the heat change when 1 mole of the element was displaced from its compound under standard state condition.
- Heat of Neutralisation
Heat of neutralisation is the heat change when 1 mol of water is formed by the neutralisation of hydrogen ions by hydroxide ions with measurements made under standard conditions.
- Heat of Combustion
The Heat of Combustion of a substance is the heat energy evolved when 1 mole of the substance is completely burnt in oxygen.