Born harber and entropy Flashcards
What is lattice formation enthalpy?
The enthalpy change when one mol of a solid ionic compound is fromed from its gaseous ions
what is lattice dissociation enthalpy?
The enthalpy change when one mol of a solid ionic compound is completely dissociated into its gaseous ions
what is the enthalpy change of atomisation of an element?
the enthalpy changhe when 1 mole of gaseous atoms is formed from an element in it’s standard state
What is enthalpy change of atomisation of a compound
The enthalpy change when 1 mole of a compound in it’s standard states is converted to gaseous atoms
what is the first electron affinity
the enthalpy change when 1 mole of gaseous -1 ions is made from 1 mole of gaseous atoms
what is the enthalpy change of hydration
the enthalpy change when 1 mole of aqueous ions is formed from gasoeous ions
what is the enthalpy change of solution
the enthalpy change when 1 mole of ionic substance dissolves in enough solvent to form an infinetly dilute solution
what two things happen when a solid ionic lattice dissolves?
1- bonds between the ions break to give gaseous ions this is endothermic
2-bonds between ions and water are made this is exothermic
what is entropy?
a measure of how much disorder there is in a system how many ways particles can arrange themselves and their energy
what happens to the entropy as you go from solid to gas
the entropy of that system increases
what does increasing the number of particles do to entropy
it increases the entropy as there are more particles and so more ways they can arrange themselves and their energy
what does dissolving a solid do to entropy
it increases the entropy of a system
what is free energy change
a measure used to predict weather a reaction is feasible
what is the reaction if the free energy change is 0 or negative
the reaction is feasible
how do you calculate enthalpy change of solution
lattice dissociation enthalpy + enthalpies of hydration
