Module 3 DEFINITIONS

Question 1

First ionisation energy

Answer 1

Energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole of gaseous 1+ ions.

Question 2

Metallic bonding

Answer 2

Strong electrostatic attraction between cations and delocalised electrons

Question 3

Enthalpy of reaction

Answer 3

Enthalpy change that accompanies a reaction in molar quantities shown in equation under standard conditions.

Question 4

Enthalpy of formation

Answer 4

Enthalpy change when one mole of compound formed from elements under standard state and conditions.

Question 5

Enthalpy of combustion

Answer 5

Enthalpy change when one mole of substance reacts completely with oxygen under standard conditions. In standard states.

Question 6

Enthalpy of neutralisation

Answer 6

Energy change that accompanies the reaction of an acid by a base to form one mole of water. Under standard conditions and standard state.

Question 7

Average bond Enthalpy

Answer 7

Energy required to break one mole of a specified bond in a gaseous molecule (endothermic)

Question 8

Bond breaking

Answer 8

Endothermic

Question 9

Bond making

Answer 9

Exothermic

Question 10

Heterogeneous catalyst

Answer 10

Catalyst and reactant in different states

Question 11

Homogeneous catalyst

Answer 11

Catalyst and reactants in same states