Definitions

Question 1

Relative atomic mass

Answer 1

The average mass of an atom of an element, relative to 1/12th the mass of a carbon-12 isotope

Question 2

First ionisation energy

Answer 2

The energy required to remove one mole of electrons from one mole of gaseous atoms to form 1 mole of gaseous 1+ ions

Question 3

Enthalpy of formation

Answer 3

The enthalpy change when 1 mole of a substance is produced from their constituent elements under standard states and standard conditions

Question 4

Enthalpy of combustion

Answer 4

The enthalpy change when 1 mole of a substance is combusted completely in oxygen under conditions
(DON’T STAY IN STANDARD STATES)

Question 5

Mean bond enthalpy

Answer 5

The average energy required to break one mole of a specific type of bond in gaseous molecules

Question 6

Hess’s law

Answer 6

The total enthalpy change for a reaction is the same, independant of the route taken, provided the initial and final conditions are the same