Ch9 - Enthalpy kw

Standard enthaply change of atomisation

The enthalpy change that takes place when 1 mole of gaseous atoms forms from the element in its standard state.

Standard enthalpy change of combustion

The enthaply change when 1 mole of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their standard states.

Standard enthaply change of formation

The enthalpy change that takes place when 1 mole of a compound is formed from its constituent elements in thei standard states under standard conditions.

Standard enthaply change of hydration

The enthaply change that takes place when 1 mole of isolated gaseous ions is dissolved in water forming 1 mole of aq ions under standard conditions.

Standard enthalpy change of neutralisation

The enthaply change that accompanies he reaction of an acid by a base to form 1 mole of H2O(l), under standard conditions, with all reactants and products in their standard states.

Standard enthalpy change of reaction

The enthalpy change that accompanies a reaction to the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states.

Standard enthaply change of solution

The enthalpy change that takes when 1 mole of a compound s completely dissolved in water under standard conditions.

Standard Conditions

Pressure = 100kPa

Stated temp (298K/25 degrees C)

Concentration = 1moldm^-3 (aq solutions)

Standard State

Physical state of a substance under standard conditions of 100kPa and a stated temp (usually 298 K).

Activation energy

Minimum energy which particles need to collide to start a reaction