standard enthalpy changes

standard conditions

pressure of 101kPa and temperature of 298K…substance in normal physical state

standard enthalpy change of reaction

enthalpy change when the amounts of the reactants shown in the stoichiometric equation react to give products under standard conditions

standard enthalpy change of formation

enthalpy change when one mole of a compound is formed from its elements under standard conditions

standard enthalpy change of combustion

enthalpy change when one mole of a substance is burnt in excess oxygen under standard conditions

standard enthalpy change of neutralisation

enthalpy change when one mole of water is formed by reaction of acid and alkali under standard conditions

specific heat capacity

energy needed to raise the temperature of 1g of a substance by 1K

heat transfer formula

q=mCt…m is mass…c is the specific heat capacity..t is the change in temperature

assumptions made using heat transfer formula

1cm3 of solution has a mass of 1g…solution has the same specific heat capacity as water

specific heat capacity of water

4.18 J/Cg

enthalpy change formula

H=/mcT