5.2.1- Lattice Enthalpy

Question 1

What is enthalpy of formation?

Answer 1

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

Question 2

What is enthalpy of combustion?

Answer 2

Enthalpy change when one mole of a substance undergoes complete combustion in oxygen with all substances in standard states

Question 3

What is enthalpy of neutralisation?

Answer 3

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

Question 4

What is first ionisation energy?

Answer 4

Enthalpy change when each atom in one mole of gaseous atoms loses one electron to form one mole of gaseous 1+ ions

Question 5

What is second ionisation energy?

Answer 5

Enthalpy change when each ion in one mole of gaseous 1+ ions loses one electron to form one mole of gaseous 2+ ions

Question 6

What is first electron affinity?

Answer 6

Enthalpy change when each atom in one mole of gaseous atoms gains one electron to form one mole of gaseous 1- ions

Question 7

What is second electron affinity?

Answer 7

Enthalpy change when each ion in one mole of gaseous 1- ions gains one electron to form one mole of gaseous 2- ions

Question 8

What is enthalpy of atomisation?

Answer 8

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

Question 9

What is hydration enthalpy?

Answer 9

Enthalpy change when one mole of gaseous ions became hydrated (dissolved in water)

Question 10

What is enthalpy of solution?

Answer 10

Enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and do not interact with each other

Question 11

What is bond dissociation enthalpy?

Answer 11

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

Question 12

What is lattice enthalpy of formation?

Answer 12

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

Question 13

What is lattice enthalpy of dissociation?

Answer 13

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

Question 14

What is enthalpy of vaporisation?

Answer 14

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

Question 15

What is enthalpy of fusion?

Answer 15

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

Question 16

What are the factors affecting enthalpy of hydration and lattice enthalpy?

Answer 16

-size of ions
-charge