Chemistry - Unit 4.1 Definitions

Lattice Enthalpy

The enthalpy change when one mole of an ionic compound is converted into gaseous ions

Enthalpy of atomisation

The enthalpy change when one mole of gaseous atoms is formed from the element in its standard state

First Electron Affinity

The enthalpy change when one mole of gaseous atoms is converted into gaseous ions with a single negative charge

Standard enthalpy of formation

The enthalpy change when one mole of compound is formed from its elements under standard conditions

Bond dissociation energy

The enthalpy required to break one mole of bond under standard conditions

Why is the second electron affinity of oxygen positive?

A second electron is being added to an already negative ion so there is a repulsion between the O- and the e-

Enthalpy of hydration

The enthalpy change when one mole of gaseous ions dissolve in water to produce one mole of aqueous ions

Enthalpy of solution

The enthalpy change when one mole of a solute dissolves in water