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Chemical Thermodynamics

NIOS · Class 12 · Chemistry

Quick revision notes for Chemical Thermodynamics — NIOS Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions30 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

1

Basic Terminology in Thermodynamics

  • System: The specific part of the universe under study (e.g., reactants and products in a beaker)
  • Surroundings: Everything outside the system (e.g., the beaker, lab, atmosphere)
  • Isolated System: No exchange of matter OR energy with surroundings (e.g., ideal thermos flask)
2

Exothermic and Endothermic Reactions

  • Exothermic reactions RELEASE heat to surroundings — the system loses energy, so ΔH is NEGATIVE
  • Endothermic reactions ABSORB heat from surroundings — the system gains energy, so ΔH is POSITIVE
  • Examples of exothermic: Combustion of fuels, neutralization reactions, adding water to quicklime (CaO)
3

Thermochemical Equations

  • Thermochemical equations specify: balanced chemical equation + physical states + ΔH value
  • Physical states are represented as: (g) = gas, (l) = liquid, (s) = solid, (aq) = aqueous solution
  • Allotropic forms must be specified: C(graphite) or C(diamond)
4

First Law of Thermodynamics and Internal Energy

  • First Law: Energy can neither be created nor destroyed; total energy of universe (or isolated system) is constant
  • Mathematical form: ΔU = q + w (IUPAC convention)
  • ΔU = change in internal energy, q = heat absorbed BY the system, w = work done ON the system

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Full Notes

Key Concepts

A system is the partState functions depend only on initialExtensive properties depend on system sizeExothermic reactions release heat to surroundingsEnergy cannot be created or destroyed

Frequently Asked Questions

What are the important topics in Chemical Thermodynamics for NIOS Class 12 Chemistry?
Key topics in Chemical Thermodynamics include Chemical Thermodynamics - Complete Chapter Overview, Chemical Thermodynamics Concept Overview, Diagram showing the relationship between system, surroundings, and universe. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Thermodynamics — NIOS Class 12 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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