Standard Enthalpy Change of Reaction - Change in enthalpy when molar quantities of reactants react together at 298 K and 1 bar, Standard Enthalpy Change of Formation - Change in enthalpy when one mole of a compound is formed from its constituent elements in their standard physical states at 298 K and 1 bar, Standard Enthalpy Change of Combustion - Heat evolved when one mole of a substance is completely burnt in excess oxygen at 298 K and 1 bar, Standard Enthalpy Change of Neutralisation - Enthalpy change when an acid and a base react to form one mole of water at 298 K and 1 bar, Standard Enthalpy Change of Atomisation - Heat absorbed when one mole of gaseous atoms is formed from its element in its standard state at 298 K and 1 bar, First Ionisation Energy, I.E - The energy required to remove one mole of the outermost electron from one mole of gaseous atoms of the element to form one mole of gaseous ions with a single positive charge., First Electron Affinity - The energy evolved when one mole of gaseous atoms accepts one mole of electrons to form one mole of gaseous singly charged negative ions, Lattice energy - Heat evolved when one mole of the solid ionic compound is formed from its isolated gaseous ions at 298K and 1 bar., Standard Enthalpy Change of Hydration - Heat evolved when one mole of the gaseous ions dissolved in water to form hydrated ions of infinite dilution at 298 K and 1 bar, Standard Enthalpy Change of Solution - Change in enthalpy when one mole of a substance is dissolved in water to form a solution of infinite dilution at 298K and 1 bar., Bond energy - (applies to covalent compound) is the energy required to break one mole of covalent bonds between two atoms in a gaseous state.,

Definitions = Enthalpy Change

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