3.1.8.1 Born-Haber Cycles
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What is a Born - Haber cycle?
A cycle consisting of many different reactions to predict the energy change in a reaction
Which direction do the arrows point in a born-haber cycle?
Positive sign: point upwards Negative sign: point downwards
What is the enthalpy of formation?
The enthalpy change when one mole of a compound is formed from its elements in their standard states, under standard conditions
What is electron affinity?
The energy change involved in adding one mole of electrons to one mole of gaseous atoms to produce one mole of gaseous -1 ions
What is bond dissociation enthalpy?
The energy needed to break one mole of the bond to give seperated atoms, in gaseous states
What is bond association enthalpy?
The energy needed to form one mole of the bond to give seperated atoms, in gaseous states
What is the enthalpy of atomisation?
The enthalpy change when one mole of gaseous atoms are formed from an element in its standard state
What is the lattice dissociation enthalpy?
The enthalpy change when one mole of a solid ionic lattice dissociates into isolated gaseous ions
What is the lattice association enthalpy?
The enthalpy change when one mole of an ionic lattice is made from its isolated ions
What is the enthalpy of hydration?
The enthalpy change when one mole of gaseous ions dissolves in sufficient water to give a solution of infinite dilution
What is the enthalpy of solution?
The enthalpy change when one mole of an ionic substance dissolves in water to give a solution of infinite solution
What happens when a metal is placed into an aqueous solution of its own ions?
An equilibrium is set up
What does a high oxidation number suggest?
That it is a good oxidising agent
What does acidic translate to in reactions?
Add H+ ions to the equation
What occurs when an ionic compound is dissolved in water?
The lattice is broken up to give seperate ions Postive ions (cations) are hydrated Negative ions (anions) are hydrated
What do ionic solids dissolve in?
Polar solvents
What does the ionic model assume?
Ions are perfect spheres Charges are distributed evenly Ions are packed together in a regular way