Thermodynamics Flashcards
What is enthalpy of formation
the energy change when 1 mole of a compound is formed from its elements under standard conditions
What are standard conditions
a temperature of 298 K and a pressure of 100 kPa
what is the enthalpy of formation sodium chloride
Na(s) + ½Cl2 (g) → NaCl (s)
what is ionisation enthalpy
the amount of energy required to remove an electron from a gaseous atom of an element to form a gaseous ion under standard conditions
What type of reaction is ionisation enthalpy
always endothermic as energy is need to overcome the attraction between an electron and the nucleus
what is the the first ionisation energy of gaseous sodium
Na (g) → Na+ (g) + e–
what is ethalpy change of atomisation
the energy change when 1 mole of gaseous atoms is formed from its element under standard conditions
What type of reaction is atomisation
always endothermic as energy is always required to break any bonds between the atoms in the element, to break the element into its gaseous atoms
what is the standard enthalpy change of atomisation for sodium
Na (s) → Na (g)
what is Bond enthalpy
The amount of energy required to break one mole of a specific covalent bond in the gas phase
what is lattice formation enthalpy
the energy released when one mole of an ionic solid is formed from its constituent ions in the gaseous state under standard conditions
what is lattice dissociation enthalpy
the enthalpy change when one mole of an ionic compound is separated into its gaseous ions under standard conditions.
what is electron affinity
the energy change when one mole of electrons is gained by one mole of gaseous atoms of an element to form one mole of gaseous ions under standard conditions
what is the first electron affinity of chlorine
Cl (g)+ e– → Cl- (g)
