Thermodynamics Flashcards
What does Hess’s law state
The enthalpy change is independent of the route taken
Def of Standard enthalpy of formation
The enthalpy change when 1 mol of a substance is formed from its elements under standard states and conditions
Def standard enthalpy of combustion
The enthalpy change when 1 mol of a Substance is combusted in excesses oxygen under standard states and conditions
Def standard enthalpy of atomisation
The enthalpy change when 1 mol of gaseous atoms is formed from a compound under standard states and conditions
Def electron affinity
Enthalpy change when one mole of gaseous atoms gain 1 mol of electrons to form one mol of a gaseous 1- ion
Def lattice enthalpy of formation
Enthalpy change when 1 mol of solid ionic lattice is formed from its constituent ions
Def lattice enthalpy of dissociation
Enthalpy change when 1 mol of solid ionic lattice is broken into gaseous ions
Def enthalpy of hydration
1 mol of gaseous ions become hydrated in water to infinite dilution
Def Enthalpy of solution
1 mol of a solute dissolves completely into a solvent to infinite dilution
Whats the perfect ionic model
Assumes ions are perfectly spherical and have the same charge
Why is the perfect ionic model inaccurate
Ions are not perfectly spherical
Not often the same charge
Gain covalent characteristics
Def entropy
Disorder of a system
What state has the most entropy
Gas
Def Gibbs free energy with an equation
£G = £H - T£S
£ - Sum of or delta
If the value for Gibbs = 0 it means
Reaction is just feasible
