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Chemistry definition

Enthalpy changes

TermDefinition
Enthalphy change of formation The enthalpy change when 1 mole of a compound is formed from it's constituent elements under standard conditions with all reactants and products in their standard states
The bond dissociation enthalpy The enthalpy change when all the bonds of the same type in 1 mole of gaseous molecules are broken
Enthalphy change of atomisation of an element The enthalpy change when 1 mole of gaseous atoms is formed from an element in its standard state
Enthalphy change of atomisation of a compound The enthalpy change when 1 mole of a compound in its standard state is converted into gaseous atoms
The first ionisation enthalpy The enthalpy change when 1 mole of gaseous 1+ ions is formed from 1 mole of gaseous atoms
The second ionisation enthalpy The enthalpy change when 1 mole of gaseous 2+ ions is formed from 1 mole of gaseous 1+ ions
First electron affinity The enthalpy change when 1 mole of gaseous 1- ions is made from 1 mole of gaseous atoms
Second electron affinity The enthalpy change when 1 mole of gaseous 2- ions is made from 1 mole of gaseous 1- ions
The enthalpy of hydration The enthalpy change when 1 mole of aqueous ions is formed from gaseous ions
The enthalpy change of solution The enthalpy change when 1 mole of solute is dissolved in sufficient solvent that no further enthalpy change occurs on further dilution.
Lattice formation enthalpy The enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions under standard conditions
Lattice dissociation enthalpy The enthalpy change when 1 mol of a solid ionic compound is completely dissociated inot its gaseous ions under standard conditions
Enthalpy change Is the heat energy transferred in a reaction at constant pressure
Standard conditions 100kPa 298K 1moldm^3 all substances in their standard states
Exothermic reaction give out energy to surroundings so the products have less energy than the reactants. -ve deltaH
Endothermic reaction take in energy from surroundings so products have more energy than the reactants. +ve deltaH
Enthalpy change of combustion The enthalpy change when 1 mole of a substance is completely burned with oxygen under standard conditions with all reactants and products in their standard states
Hess's Law The enthalpy change is the same independent of the route taken.
Created by: Carrie Wong ^.^