Bond Enthalpies Flashcards
Define the enthalpy of atomisation.
The enthalpy change when 1 mole of gaseous atoms are formed from their elements in their standard state under standard conditions (298K, 1atp)
Define the enthalpy of combustion.
The enthalpy change when 1 mole of a substance is burned completely in excess oxygen under standard conditions.`(298K, 1atp)
Define the enthalpy of formation.
The enthalpy change when 1 mole of a substance is formed from its elements in their standard state under standard conditions. (298K, 1atp)
Define the enthalpy of neutralisation.
The enthalpy change when an acid reacts with an alkali to form 1 mole of water under standard conditions. (298K, 1atp)
Define the enthalpy of reaction.
The enthalpy change of a reaction according to the equation.
Define enthalpy change.
The heat energy transferred in a reaction at constant pressure.
What is the equation for energy transferred and what does each component mean?
Q = mcAT (A=delta). Q = energy transferred m = mass of water c = specific heat capacity AT = Temperature change
What is the equation for enthalpy changes?
AH = Q/moles
Define the first ionisation energy.
The enthalpy change when 1 mole of electrons is removed from 1 mole of gaseous atoms to form 1 mole of gaseous ions.
Define the first electron affinity.
The enthalpy change when 1 mole of electrons is added to 1 mole of gaseous atoms under standard conditions.
Define Lattice energy.
The enthalpy change when 1 mole of crystalline solid is formed from its ions in their gaseous state. (298K, 1atp)
Define Bond dissociation enthalpy
The enthalpy change when 1 mole of covalent bonds in their gaseous state are broken, to form gaseous atoms, under standard conditions.
Define Hess’ Law
The enthalpy change is independent of the path taken.
Define salvation energy
The enthalpy change when 1 mole of gaseous ions dissolves in excess water.
