Energetics

What does enthalpy refer to?

All the heat energy that is stored in a chemical system.

Define activation energy

Minimum energy required for a chemical reaction to take place.

Define standard enthalpy change of combustion.

Enthalpy change when one mole of a substance reacts completely with oxygen under standard conditions.

All the chemicals are in standard states.

Products of complete combustion

CO2 and water.

Define standard enthalpy change of neutralisation.

Enthalpy change when one mole of water is formed in a neutralisation reaction under standard conditions.

Define standard enthalpy change of formation

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

Be accurate with elements 

Define standard enthalpy change of reaction.

enthalpy change when a reaction takes place in the molar quantities showed by the balanced chemical equation under standard conditions.

All chemicals in standard states.