Energetics Flashcards
What is enthalpy change
heat or energy change under constant pressure
What is the equation for energy change
energy change= mass x specific heat capacity x temp change
What is hess law
The enthalpy change for a reaction is independent of the the route taken
What is Enthalpy change of formation
Enthalpy change when 1 mole of a compound is formed from is constituent elements in their standard state and under standard conditions
Enthalpy change of formation arrows go
upwards
how to workout bond enthalpy
Reactants - products both in positive form
What is enthalpy change of combustion
Enthalpy change when 1 mole of a compound is burned completely in oxygen when all reactants and products are in their standard state and under standard conditions
What is enthalpy change of combustion
Enthalpy change when 1 mole of a compound is burned completely in oxygen when all reactants and products are in their standard state and under standard conditions
Enthalpy change of combustion arrows go
downwards
Enthalpy of atomisation/bond enthalpy
When 1 mol of gaseous atoms are formed from an element in their standard state
Enthalpy of 1st ionisation
when 1 mol of gaseous +1 ions are formed from 1 mol of gaseous atoms
Enthalpy of electron affinity
When 1 mol of gaseous -1 ions are formed from 1 mol of gaseous atoms
Enthalpy of lattice formation
when 1 mol of solid ionic compound is formed from its from its gaseous ions
Enthalpy of lattice dissociation
When 1 mol of solid ionic compound separates into its gaseous ions
Enthalpy of hydration
when 1 mol of aqueous ions is formed from 1 mol of gaseous ions
