Physical chemistry

Cards (8)

What is enthalpy? 
Enthalpy is the heat energy of a system
What are standard conditions?
100kPa, 298K
What is the enthalpy change of formation?
The enthalpy change of formation is the heat released or absorbed when one mole of a compound is formed from its reactants under standard conditions.
What is the enthalpy change of combustion? 
The energy change that takes place when one mole of a substance reacts completely with oxygen.
What is the enthalpy change of neutralisation?
Its the enthalpy change that accompanies the reaction of an acid by a base to form one mole of H2O(l), under standard conditions. This value is the same for all neutralisation reactions if strong acids and bases are used
What is the equation for energy change?
q=mcΔT
What is the equation for energy change in kj per mole?
ΔH = mcΔT/1000n, where n is the number of moles.
When creating a Hess cycle for enthalpy of formation, which direction do the arrows point?
From the elements to the reactants and products