Enthalpy Glossary Flashcards
Standard enthalpy of reaction
The energy that accompanies a reaction in the molar quantities shown in chemical equation, under standard conditions + states
Standard ethalpy of formation
The enthalpy change that accompanies the formation of 1 mole of a compound from its elements in their standard states + under stamdard conditions
Standard enthalpy of combustion
The enthalpy change that accompanies the complete combustion of 1 mol of a substance under standard conitions + states
Enthalp of neutralisation
The enthalp change when 1 mole of water is formed from its ions in dilute solution under standard conditions + states ( always -57kj mol-1)
Standard conditions
101kpa
298k ( 25c)
1 mol dm-3 ( if solution)
Eqution to find enthalpy change
Enthalpy change = enthalpy of products- enthalpy of reactants
Definition of enthalpy
A measure of the heat content of a substance at a constant pressure
Enthalpy change definition
The energy transferred between a system and its surroundings at abconctant pressure( final temp= starting temp)
Eqution for energy transfer ( q)
Q= M x C x temp change
C= 4.18 ( constant)
Equation for enthalpy change
q / mole
mole is the limiting factor in the equation
Bond enthalpy
Enthalpy change to break 1 mole of covalent bonds in gaseous state
