Energetics

Question 1

Enthalpy change of reaction

Answer 1

enthalpy change when molar quantities of reactants stated in the chemical equation react to form products at 298K and 1 bar

Question 2

Enthalpy change of formation

Answer 2

enthalpy change when one mole of compound is formed from its constituent element sin their standard states at 298K and 1 bar

Question 3

Enthalpy change of combustion

Answer 3

enthalpy change when one mole of a substance is completely burned in excess oxygen at 298K and 1 bar

Question 4

Enthalpy change of neutralisation

Answer 4

enthalpy change when and acid reacts with a base to form one mole of water at 298K and 1 bar

Question 5

Enthalpy change of atomisation

Answer 5

enthalpy change to form one mole of a gaseous atom from the element in its standard state at 298K and 1 bar

Question 6

Enthalpy change if hydration

Answer 6

enthalpy change when one mole of the gaseous ions is dissolved in a large amount of water to form one mole of aqueous ions at 298K and 1 bar

Question 7

Enthalpy change of solution

Answer 7

enthalpy change when one mole of a substance is completely dissolved in a large excess of solvent to form an infinitely dilute solution at 298K and 1 bar

Question 8

Bond energy

Answer 8

enthalpy change to break one mole of a covalent bond between two atoms in the gaseous state

Question 9

First ionisation energy

Answer 9

enthalpy change to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous singly charged anions

Question 10

First electron affinity

Answer 10

enthalpy change when one mole of gaseous atoms gains one mole of electrons to form one mole of singly charged gaseous anions

Question 11

Lattice energy

Answer 11

enthalpy change when one mole of pure solid ionic compound is formed from its constituent gaseous ions.