Chemical Thermodynamics — Chapter Summary
Maharashtra Board · Class 12 · Chemistry
Summary of Chemical Thermodynamics for Maharashtra Board Class 12 Chemistry. Part of the Maharashtra Board Class 12 Chemistry syllabus.
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Overview
Chemical Thermodynamics is a fundamental branch of chemistry that deals with energy changes during physical and chemical transformations. This chapter explores how energy is transformed from one form to another in chemical reactions, helping us understand whether reactions occur spontaneously and ho
Key Concepts
A system is the part
A system is the part of universe under study, while surroundings include everything else. Systems can be open (exchange both matter and energy), close
State functions (like P
State functions (like P, V, T, U, H, S, G) depend only on the current state, not on how that state was reached. Path functions (like Q and W) depend o
States that energy cannot be created
States that energy cannot be created or destroyed, only converted. Mathematically: ΔU = Q + W, where ΔU is change in internal energy, Q is heat added
Defined as H = U +
Defined as H = U + PV. For reactions at constant pressure, ΔH = Qp (heat absorbed at constant pressure). Related to internal energy by ΔH = ΔU + ΔngRT
A measure of molecular disorder
A measure of molecular disorder or randomness in a system. ΔS = Qrev/T for reversible processes. Entropy increases from solid → liquid → gas phases an
Learning Objectives
- Understand basic thermodynamic terms like system, surroundings, and state functions
- Apply the First Law of Thermodynamics to calculate internal energy changes
- Calculate enthalpy changes for various physical and chemical processes
- Use Hess's Law to determine reaction enthalpies from known data
- Understand entropy as a measure of disorder and its role in spontaneity
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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