Thermodynamics

Question 1

Enthalpy of formation

Answer 1

Enthalpy change when one mole of a substance is formed from its constituent elements in their standard states

Question 2

Enthalpy of combustion

Answer 2

Enthalpy change when one mole of a substance undergoes combustion under oxygen in standard states

Question 3

Enthalpy of neutralisation

Answer 3

Enthalpy change when one mole is formed in a reaction between an acid and an alkali under standard conditions

Question 4

Ionization energy

Answer 4

Enthalpy change when one atom in one mole of gaseous atoms loses one electron to form one mole of gaseous ion

Question 5

Electron affinity

Answer 5

Enthalpy change when each atom in one mole of gaseous atoms gains one electron to form one mole of gaseous ions

Question 6

Enthalpy of atomisation

Answer 6

Enthalpy change when one mole of gaseous atoms loses is produced from an element in its standard state

Question 7

Hydration enthalpy

Answer 7

Enthalpy change when one mole of gaseous ion becomes hydrated

Question 8

Enthalpy of solution

Answer 8

Enthalpy change when one mole of an ionic solid dissolves in an amount of water so dissolved ions are separated

Question 9

Bond dissociation Enthalpy

Answer 9

Enthalpy change when one mole of covalent bonds is broken in the gaseous state

Question 10

Lattice enthalpy of formation

Answer 10

Enthalpy change when one mole of a solid ionic compound is formed from its constituent ions in the gas phase

Question 11

Lattice Enthalpy of dissociation

Answer 11

Enthalpy change when one mole of a solid ionic compound is broken up into its constituent ions in the gas phase

Question 12

Enthalpy of vaporization

Answer 12

Enthalpy change when one mole of a liquid is turned into a gas

Question 13

Enthalpy of fusion

Answer 13

Enthalpy change when one mole of a solid is turned into a liquid