Thermodynamics Flashcards
Bond dissociation enthalpy
All bonds of same type in 1 mole of gaseous molecules are broken
Enthalpy change of atomisation if an element
1 mole of gaseous atoms is formed from an element in its standard state
Enthalpy change atomisation of a compound
1 mole of a compound in its standard state is converted to gaseous atoms
First ionisation enthalpy
1 mole of gaseous +1 ions is formed from 1 mole of gaseous atoms
Second ionisation enthalpy
1 mole of gaseous 2+ ions formed from 1 mole of gaseous 1+ ions
First electron affinity
1 mole of gaseous 1- ions made from 1 mole of gaseous atoms
Second electron affinity
1 mole gaseous 2- ions made from 1 mole gaseous 1- ions
Enthalpy change of hydration
1 mole of aqueous ions formed from gaseous ions
Enthalpy change of solution
1 mole of solute is dissolved in sufficient solvent that no further enthalpy change occurs on further dilution
Enthalpy change formation
1 mole compound formed from elements in standard states under standard conditions
Order of BH cycles
1) enthalpy formation
2) atomisation
3) ionisation
4) electron affinity
5) enthalpy formation
What does entropy tell you
The level of disorder
What three things affect entropy
1) physical state
2) dissolving
3) no. of particles
Which state is there the most entropy/disorder?
Gaseous state
What is the formula for entropy?
DeltaS system + deltaS surroundings
