Thermodynamics

Question 1

Lattice enthalpy

Answer 1

enthalpy change when 1 mole of a solid ionic compound is formed from its constituent gaseous ions

Question 2

Atomisation enthalpy

Answer 2

enthalpy when 1 mole of gaseous atoms is formed from the element in its standard states

Question 3

first ionisation energy

Answer 3

energy needed to remove one electron from each atom in a mole of gaseous atoms of an element

Question 4

first electron affinity

Answer 4

enthalpy change when one electron is added to each gaseous atom in 1 mole to form one mole of gaseous ions

Question 5

standard enthalpy change of solution

Answer 5

is the enthalpy change when one mole of compound is dissolved in water under standard conditions

Question 6

standard enthalpy change of hydration

Answer 6

enthalpy change when one mole of aqueous ions is formed from their gaseous ions under standard conditions

Question 7

enthalpy of formation

Answer 7

The enthalpy of formation (ΔHfꝋ) is the enthalpy change when 1 mole of a compound is formed from its elements under standard conditions

Question 8

bond enthalpy

Answer 8

The amount of energy required to break one mole of a specific covalent bond in the gas phase is called the bond dissociation energy
Bond dissociation energy (E) is usually just simplified to bond energ

Question 9

equation representing formation of sodium chloride

Answer 9

Na(s) + 1/2Cl2 —->NaCl(s)

Question 10

equation representing atomisation of sodium

Answer 10

Na(s) —-> Na(g)

Question 11

equation representing enthalpy of atomisation of chlorine

Answer 11

1/2Cl(s) —> Cl2(g)

Question 12

equation representing first ionisation energy of sodium

Answer 12

Na(g) —-> Na+ (g) + e-

Question 13

equation representing first electron affinity of chlorine

Answer 13

Cl(g) + e- —> Cl- (g)