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Thermodynamics — Chapter Summary

CBSE · Class 11 · Chemistry

Summary of Thermodynamics for CBSE Class 11 Chemistry. Part of the CBSE Class 11 Chemistry syllabus. Thermodynamics studies energy changes in chemical.

116 questions92 flashcards10 formulas & key relations5 concepts

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Overview

Thermodynamics studies energy changes in chemical and physical processes. It connects heat, work, internal energy, enthalpy, entropy, and Gibbs energy, and explains when a process is spontaneous and how much useful work can be obtained from it. The universe is treated as the system plus the surround

Key Concepts

A system is the part

A system is the part of the universe where observations are made. Everything else is the surroundings. The boundary is the real or imaginary wall that

An open system exchanges both matter

An open system exchanges both matter and energy with the surroundings. A closed system exchanges energy but not matter. An isolated system exchanges n

Internal energy U is the total

Internal energy U is the total energy of the system, including chemical, electrical, mechanical, and other forms. It is a state function, so its chang

The first law is the law

The first law is the law of conservation of energy and is written as ΔU = q + w. Heat and work are path functions, but their sum gives the change in i

For expansion or compression against constant

For expansion or compression against constant external pressure, w = -p_ex(V_f - V_i). For reversible change, w_rev = -∫ p_ex dV. For reversible isoth

Learning Objectives

  • Define system, surroundings, boundary, and classify open, closed, and isolated systems.
  • Explain internal energy, heat, work, and the first law of thermodynamics.
  • Use sign conventions correctly for heat and work in chemical thermodynamics.
  • Relate work to pressure-volume change and distinguish reversible, irreversible, and free expansion.
  • Define enthalpy and relate it to internal energy through ΔH = ΔU + Δn_g RT.

Frequently Asked Questions

What are the important topics in Thermodynamics for CBSE Class 11 Chemistry?
Key topics in Thermodynamics include Basic thermodynamic terms, Internal energy, heat, work, and the first law, Work, pressure-volume work, and reversible processes, Enthalpy and relation between ΔH and ΔU. Study these first, then practise questions on each for Class 11 exams.
How should I revise Thermodynamics for Class 11 exams?
Learn the core ideas first, then work through the 116 practice questions on Thermodynamics. Revise 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.

More resources for Thermodynamics

All CBSE Class 11 Chemistry Chapter Summary

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