A2 - Enthalpy Changes

Question 1

What is activation energy?

Answer 1

The minimum energy required for a reaction to take place.

Question 2

What is the standard enthalpy change of reaction?

Answer 2

The enthalpy change that accompanies a reaction in the molar quantities shown in a chemical equation under standard conditions, with all reactants and products in their standard states.

Question 3

What is the standard enthalpy change of formation?

Answer 3

The enthalpy change that takes place when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states.

Question 4

What is the standard enthalpy change of combustion?

Answer 4

The enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, with all reactants and products in their standard states.

Question 5

What is the enthalpy change of neutralisation?

Answer 5

The energy change that accompanies the reaction of an acid by a base to form one mole of H2O (l), under standard conditions, with all reactants and products in their standard states.