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Thermodynamics

CBSE · Class 11 · Chemistry

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

116 questions92 flashcards5 concepts

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Key Topics to Revise

1

1. Basic thermodynamic terms

  • The universe is composed of the system plus the surroundings.
  • A system is that part of the universe in which observations are made.
  • Surroundings mean everything other than the system.
2

2. Internal energy, heat, work, and the first law

  • Internal energy is the total energy of the system, including chemical, electrical, and mechanical energy.
  • Internal energy changes when heat is transferred, work is done, or matter enters or leaves the system.
  • Work done on the system increases internal energy; work done by the system decreases it.
3

3. Work, pressure-volume work, and reversible processes

  • In chemistry, the most common work is pressure-volume work.
  • For expansion against constant external pressure, work is negative because the system does work on the surroundings.
  • For compression, work is positive because work is done on the system.
4

4. Enthalpy and relation between ΔH and ΔU

  • Enthalpy is a useful state function for reactions at constant pressure.
  • Enthalpy is defined as H = U + pV.
  • At constant pressure, heat absorbed by the system equals the enthalpy change.

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Full Notes

Key Concepts

A system is the partAn open system exchanges both matterInternal energy U is the totalThe first law is the lawFor expansion or compression against constant

Frequently Asked Questions

What are the important topics in Thermodynamics for CBSE Class 11 Chemistry?
Thermodynamics covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Thermodynamics — CBSE Class 11 Chemistry?
Understand the core concepts first, then work through the 116 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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