Notes of Chapter 07: Thermochemistry of “Chemistry XI” for FSc Part 1 published by Punjab Textbook Board, Lahore. These notes are very helpful to prepare Chemistry paper of FSc Part 1 for Federal Board, Multan Board, Faisalabad Board, Sargodha Board, Gujranwala Board, DG Khan Board, Rawalpindi Board or any other board of Punjab, Pakistan.

It is matter of common observation that energy in the form of heat, either evolved or absorbed as a result of chemical change. This is mostly due to the breaking of bonds in reactions and formation of new bonds in the product …

• Introduction
• Spontaneous and non-spontaneous reactions
• System, surrounding and state function
• Internal energy and first law of thermodynamics
• Enthalpy
• Hess's law of constant heat summation