Topic 8 - Energetics

Question 1

Standard enthalpy of combustion (ΔcHꝊ)

Answer 1

the enthalpy change when 1 mol of a substance is burned completely, in an excess of oxygen, under standard conditions

Question 2

Standard enthalpy of neutralisation (∆neutHꝊ)

Answer 2

the enthalpy change when 1 mol of water is formed during neutralisation of an acid and a base under standard conditions

Question 3

Standard enthalpy of formation (ΔfHꝊ)

Answer 3

the enthalpy change when 1 mol of a compound is formed from its elements under standard conditions with all reactants and products in their standard states

Question 4

Standard enthalpy of reaction (ΔrHꝊ)

Answer 4

the quantity of heat energy released/absorbed when 1 mol of substance is formed/combusted during a chemical reaction under standard conditions of temperature and pressure