CBSE 11 Chemistry · U5

Chemical Thermodynamics

CBSE Class 11 Chemistry Unit V: thermodynamic terms, first law, internal energy and enthalpy, calorimetry, Hess law, reaction enthalpies, entropy, spontaneity and Gibbs energy.

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A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.

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Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Topic 5.1

Thermodynamic Terms and State Functions

System, surroundings, boundary, open/closed/isolated systems, heat, work, energy, extensive and intensive properties, and state functions

Topic 5.2

First Law, Heat, Work, Internal Energy and Enthalpy

First law of thermodynamics, sign convention, expansion work, pressure-volume work, internal energy and enthalpy relation

Topic 5.3

Calorimetry, Heat Capacity and Specific Heat

Heat capacity, specific heat, calorimetry at constant volume and constant pressure, and measurement of internal-energy and enthalpy changes

Topic 5.4

Hess Law and Reaction Enthalpies

Hess law, thermochemical equations, enthalpy of formation, combustion, atomization, sublimation, phase transition, bond dissociation and lattice-related reasoning

Topic 5.5

Entropy, Spontaneity and Gibbs Energy

Entropy change, spontaneity, Gibbs energy change, relation between enthalpy, entropy and temperature, and qualitative equilibrium connection