definitions

Question 1

standard enthalpy change of formation

Answer 1

the energy transferred when 1 mole of the compound is formed from its elements under standard conditions

Question 2

standard enthalpy of atomisation

Answer 2

the enthalpy change when 1 mole of gaseous atoms is formed from the element in standard state

Question 3

first ionisation energy

Answer 3

energy required to remove 1 mole of electrons to from 1 mole of gaseous +1 ions
Mg(g) -> Mg(g)+ +e-

Question 4

first electron affinity

Answer 4

enthalpy change that occurs when 1 mole of gaseous atoms gains 1 mole of electros from 1 mole of gaseous -1 ions
O(g) + e- -> O(g)-

Question 5

Lattice energy

Answer 5

when 1 mole of an ionic crystal lattice is formed from its constituent ion in gaseous state

Question 6

enthalpy of solution

Answer 6

when 1 mole of an ionic solid dissolves in large enough water to ensure dissolved ions are well separated and don’t interact with each other

Question 7

enthalpy change of hydration

Answer 7

when 1 mole of gaseous ions become hydrated such that further dilution causes no further heat change

Question 8

enthalpy change of reaction

Answer 8

enthalpy change when quantities react in standard conditions and standard state

Question 9

enthalpy change of combustion

Answer 9

when 1 mole of a substance burned completely in oxygen under standard conditions

Question 10

enthalpy change of neutralisation

Answer 10

when acid and alkali react under standard conditions to produce 1 mole of water

Question 11

bond enthalpy

Answer 11

energy required to break 1 mole of stated bond in a gaseous state under standard conditions

Question 12

bronzed Lowry acid

Answer 12

a substance that can donate a proton (a base accepts proton)