Enthalpy Definitions Flashcards
What is the enthalpy of formation?
The enthalpy change when one mole of a substance is formed from its constituent elements with all substances in their standard states
What is the enthalpy of combustion?
The enthalpy change when one mole of a substance undergoes complete combustion in oxygen with all substances in their standard states
What is the enthalpy of neutralisation?
The enthalpy change when one mole of water is formed in a reaction between an alkali and acid under standard conditions
What is the first ionisation energy?
The first ionisation energy is the enthalpy change when each atom in one mole of gaseous atoms loses an electron to form one mole of gaseous 1+ ions
What is the 1st electron affinity?
The first electron affinity is the enthalpy change when each atom in one mole of atoms gains one electron to form one mole of gaseous 1- ions
What is the enthalpy of atomisation?
The enthalpy change when one mole of gaseous atoms is produced from an element in its standard state
What is the hydration enthalpy?
The enthalpy change when one mole of gaseous ions becomes hydrated
What is the enthalpy of solution?
The enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and do not interact with each other
What is the bond dissociation enthalpy?
The enthalpy change when one mole of covalent bonds is broken in the gaseous state
What is the lattice enthalpy of formation?
The enthalpy change when one mole of a solid ionic compound is formed from its constituent ions in the gas phase
What is the lattice enthalpy of dissociation?
The enthalpy change when one mole of a solid ionic compound is broken up into its constituent ions in the gas phase
What is the enthalpy of vaporisation?
The enthalpy change when one mole of a liquid is turned into a gas
What is the enthalpy of fusion?
The enthalpy change when one mole of a solid is turned into a liquid
What is the mean bond enthalpy?
The average enthalpy change needed to break one mole of covalent bonds in the gas phase over several compounds (Bonds broken- bonds formed)
What does the purely ionic model of a lattice assume?
That all the ions are spherical and have their charge evenly distributed around them
