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First Law of Thermodynamics
Energy cant be made or destroyed. It's dissipated
Enthalpy Change and its units?
The heat transfer of a reaction at an constant pressure.
Unit are KJ mol-1
Standard enthalpy change of formation?
The enthalpy change when one mole of a compound is formed from its elements in their standard states at 298K and 1 atm
Standard enthalpy change of combustion?
The enthalpy change when one mole of a substance is completely burnt in excess oxygen at 298K and 1 atm
Standard enthalpy change of neutralisation
The enthalpy change when an acid reacts with a base to form one mole of water at 298K and 1 atm
Standard enthalpy change of atomisation
The enthalpy change when one mole of atoms in their gaseous state is formed from an element in its standard state at 298K and 1 atm
Mean bond enthalpy/Bond dissociation enthalply
The enthaply change required to break one mole of covelant bond in the gaseous state
Standard enthalpy change of a reaction
The enthalpy change when the reaction occurs in the molar quantities shown in the balanced equation at 298K and 1 atm
The total enthaply change of a reaction is independent of the route taken
Tenthalpy change when 1 mole
of an ionic crystal lattice is formed from its constituent ions in gaseous form.
1st electron affinity
The enthalpy change when one mole of electrons are added to one mole of gaseous atoms to form one mole of singly charged negative ions in a gaseous state at 298K and 1 atm
1st Ionisation energy?
The enthalpy change when one mole of electrons are removed from one mole of gaseous atoms to form one mole of singly charged positive ions in a gaseous state at 298K and 1 atm
AS Chemistry Unit 1