Thermodynamics

Question 0

Define enthalpy of atomisation

Answer 0

The enthalpy change when one mole of gaseous atoms is formed from their elements under standard conditions and in standard states

Question 1

Define enthalpy of formation

Answer 1

Enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions. All reactants and products in standard states

Question 2

Define first ionisation energy

Answer 2

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

Question 3

Define the first electron affinity

Answer 3

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

Question 4

Define bond dissociation enthalpy/ mean bond enthalpy

Answer 4

The enthalpy change when one mole of gaseous molecules each breaks a covalent bond to form two free radicals, averaged over a range of compounds

Question 5

Define lattice formation enthalpy

Answer 5

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

Question 6

Define enthalpy of hydration

Answer 6

Enthalpy change when water molecules surround one mole of gaseous ions

Question 7

Define enthalpy of solution

Answer 7

Enthalpy change when one mole of solute dissolves completely in sufficient solvent to form a solution in which the molecules or ions are far enough apart not to interact with eachover