Thermodynamics Definitions A2 Chemistry

Front 1

The standard (molar) enthalpy of formation

Back 1

The enthalpy change when one mole of compound is formed from its constituent elements under standard conditions, all products and reactants are in their standard states

Front 2

The standard enthalpy of atomisation

Back 2

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

Front 3

Ionisation energy

Back 3

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

Front 4

First electron affinity

Back 4

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

Front 5

Latrice enthalpy of formation

Back 5

The enthalpy change when one mole of solid ionic compound is formed from its gaseous ions

Front 6

State Hess’s Law

Back 6

The total enthalpy change of a reaction is independent of the route it takes

Front 7

Enthalpy of lattice dissociation

Back 7

When one mole of ionic compound separates into its gaseous ions

Front 8

State standard conditions

Back 8

100kPa and 298K or 25C

Front 9

Is the enthalpy of lattice formation positive or negative

Back 9

Negative

Front 10

The enthalpy of lattice dissociation is positive or negative

Back 10

Positive

Front 11

Enthalpy change

Back 11

Hear change measured at constant pressure