Chapter 9 of 19
Revision Notes
Thermodynamics — Revision Notes
NEST · Chemistry
Quick revision notes for Thermodynamics — key concepts, formulas, and definitions for NEST Chemistry preparation.
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Key concepts, formulas, and definitions from Thermodynamics for NEST Chemistry preparation.
Key Topics to Revise
1
5.1 Thermodynamic Terms and Systems
- A thermodynamic system is the part of the universe under study, while surroundings constitute the rest of the universe
- Open system: Exchange of both matter and energy with surroundings (e.g., boiling water in open pan)
- Closed system: Exchange of energy only, no matter exchange (e.g., water in sealed bottle)
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5.2 Applications - Work and Heat Calculations
- For isothermal reversible expansion: w = -nRT ln(Vf/Vi) = -2.303nRT log(Vf/Vi)
- For free expansion (expansion into vacuum): w = 0
- For adiabatic process: q = 0, so ΔU = w
3
5.3 Enthalpy and Calorimetry
- Enthalpy H = U + PV (extensive property and state function)
- At constant pressure: qp = ΔH
- At constant volume: qv = ΔU
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5.4 Standard Enthalpy Changes and Hess's Law
- Standard conditions: 298K, 1 bar pressure, pure substances
- Standard enthalpy of formation (Δf H°): enthalpy change when 1 mol compound formed from elements
- Standard enthalpy of formation of elements in standard state = 0
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Key Concepts
A thermodynamic system is the partEnergy cannot be created or destroyedEnthalpy is the total heat contentWork done by gas during expansionDifferent enthalpy types
Frequently Asked Questions
What topics are covered in Thermodynamics for NEST?
Thermodynamics is an important chapter in NEST Chemistry. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: 5.1 Thermodynamic Terms and Systems, 5.2 Applications - Work and Heat Calculations, 5.3 Enthalpy and Calorimetry, 5.4 Standard Enthalpy Changes and Hess's Law.
How important is Thermodynamics for NEST?
Thermodynamics is a frequently tested chapter in NEST Chemistry. Questions from this chapter appear regularly in previous year papers. There are 269 practice questions available for this chapter.
How to prepare Thermodynamics for NEST?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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