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Thermodynamics

Punjab Board · Class 11 · Chemistry

Quick revision notes for Thermodynamics — Punjab Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions25 flashcards5 concepts

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A diagram illustrating the three types of thermodynamic systems: open, closed, and isolated, showing the exchange of matter and energy with the surroundings.
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Key Topics to Revise

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1. Basic Thermodynamic Terms: System, Surroundings, and Types of Systems

  • The SYSTEM is the part of the universe under study. The SURROUNDINGS is everything else. Together, System + Surroundings = Universe.
  • OPEN SYSTEM: Both matter AND energy can be exchanged with surroundings. Example: Reactants in an open beaker.
  • CLOSED SYSTEM: Only ENERGY can be exchanged, NOT matter. Example: Reactants in a sealed copper vessel.
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2. Internal Energy, Work, Heat, and the First Law of Thermodynamics

  • INTERNAL ENERGY (U) is the total energy of the system — sum of all kinetic and potential energies of all particles.
  • Internal energy is a STATE FUNCTION. We can only measure CHANGE in internal energy (ΔU), not absolute U.
  • WORK (w): When external pressure pex compresses a gas from Vi to Vf, work done on system = w = −pex × ΔV.
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3. Enthalpy (H), Heat Capacity, and Relationship Between ΔH and ΔU

  • ENTHALPY (H) = U + pV. It is a state function defined to handle constant pressure processes.
  • At constant pressure: ΔH = qp. Heat absorbed at constant pressure equals change in enthalpy.
  • Relationship: ΔH = ΔU + ΔngRT, where Δng = moles of gaseous products − moles of gaseous reactants.
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4. Enthalpy Changes: Standard Enthalpy, Formation, Combustion, Hess's Law

  • STANDARD STATE: Pure form of a substance at 1 bar pressure and specified temperature (usually 298 K). Denoted by superscript ⊖.
  • STANDARD ENTHALPY OF REACTION (Δr H⊖): Enthalpy change when reaction occurs with all substances in standard states.
  • STANDARD ENTHALPY OF FORMATION (Δf H⊖): Enthalpy change when 1 mole of a compound is formed from its elements in their most stable reference states.

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Full Notes

Key Concepts

In thermodynamicsInternal energy is the sumWork (w) in chemistry primarily refersEnthalpy H = U + pVCalorimetry measures heat changes

Frequently Asked Questions

What are the important topics in Thermodynamics for Punjab Board Class 11 Chemistry?
Key topics in Thermodynamics include Thermodynamics - Complete Chapter Overview, Thermodynamics — Complete Chapter Overview, Thermodynamics Concepts Overview. These are the concepts Punjab Board Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Thermodynamics — Punjab Board Class 11 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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