3.2.1 - Enthalpy Changes Definitions

Question 1

What is standard enthalpy change of reaction?

Answer 1

Enthalpy change that occurs between molar quantities of reactants, as shown in the chemical equation, under standard conditions to give products in their standard state.

Question 2

What is standard enthalpy change of formation?

Answer 2

This is the enthalpy change when one mole of a compound is formed from its elements under standard conditions,both compound and elements are in their standard states.

Question 3

What is standard enthalpy change of combustion?

Answer 3

This is the enthalpy change when one mole of an element or compound reacts completely with oxygen under standard conditions.

Question 4

What is standard enthalpy change of neutralisation?

Answer 4

This is the enthalpy change when one mole of water is formed from a neutralisation reaction.