1
First law and sign convention
For a closed system (exchanges energy, not matter): Heat and work are counted positive when received by the system, negative when given out. is a state function; and depend on the path taken.
University11 min
First law and reaction enthalpy
The signs of Q and W, going from ΔU to ΔH, and Hess's law applied the right way round: compute a reaction enthalpy without dropping marks.
The essentials
2
Pressure–volume work
Members only
3
Enthalpy
Members only
4
Calorimetry
Members only
5
Enthalpy of formation and Hess's law
Members only