3.2: Standard Enthalpy Change Definitions

Question 1

What is meant by the standard enthalpy change of reaction?

Answer 1

The enthalpy change that accompanies a reaction in the molar quantities shown in a chemical equation, under standard conditions.

Question 2

What is meant by the standard enthalpy change of formation?

Answer 2

The enthalpy change that takes place when one mole of a compound is formed from its elements, under standard conditions.

Question 3

What is meant by the standard enthalpy change of combustion?

Answer 3

The enthalpy change that takes place when one mole of a substance reacts completely with oxygen, under standard conditions.

Question 4

What is meant by the standard enthalpy change of neutralisation?

Answer 4

The enthalpy change that accompanies a reaction of an acid by a base to form one mole of water, under standard conditions with all reactants and products in their standard states.