Lecture 4 - Born-Haber Cycles Flashcards
what does a born-haver cycle show?
the enthalpy changes that occur when an ionic lattice is formed
arrows going up show?
endothermic process
arrows got down show?
exothermic process
define enthalpy of lattice dissociation
the enthalpy change when one mole of an ionic compound is separated into its constituent gaseous ions
define Enthalpy of lattice formation
the enthalpy change when one mole of an ionic compound is formed from its constituent gaseous ions
what are the 2 factors that affect lattice enthalpy
- charge of the jones, higher charge more attracted to eachother
- radius of the ions, smaller ions packed in lattice closely so are more attracted to each other
whats Enthalpy of formation, ΔfHo?
The enthalpy change when 1 mole of a compound is formed from its constituent elements with all reactants and products in standard states under standard conditions
whats Ionisation enthalpy, ΔIEHo?
The first ionisation enthalpy is the enthalpy change when one electron is removed from one mole of gaseous atoms to form one mole of gaseous ions with a 1+ charge
whats Enthalpy of atomisation, ΔatHo?
The enthalpy change for the formation of one mole of gaseous atoms from the element in its standard state
whats Enthalpy of vaporisation, ΔvapHo?
The enthalpy change for the vaporisation of a liquid substance into a gas
whats Bond dissociation enthalpy, ΔdissHo?
The enthalpy change when one mole of a covalent bond is broken under standard conditions in the gaseous state
whats the bond dissociation enthalpy of a diatomic element ?
twice the value for the enthalpy of atomisation of that element
whats Electron affinity, ΔeaHo?
The enthalpy change when one electron is added to one mole of gaseous atoms to form one mole of gaseous ions with a 1- charge
