Energetics
What is enthalpy (H):
Hess law and some calculations:
http://www.chem.tamu.edu/class/majors/tutorialnotefiles/enthalpy.htm
http://grandinetti.org/Teaching/Chem121/Lectures/Enthalpy/index.html
Entropy and the second law of thermodynamics:
http://www.secondlaw.com/two.html#time
http://www.ausetute.com.au/enthchan.html
http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/energy1.htm#enrg1
Hess law and some calculations:
http://www.chem.tamu.edu/class/majors/tutorialnotefiles/enthalpy.htm
http://grandinetti.org/Teaching/Chem121/Lectures/Enthalpy/index.html
Entropy and the second law of thermodynamics:
http://www.secondlaw.com/two.html#time