Ch 05 - Thermodynamics11th Chemistry
Thermodynamics vs. Mechanics
Why does thermodynamics focus entirely on bulk matter and completely ignore the behavior of individual molecules?
Why does thermodynamics focus entirely on bulk matter and completely ignore the behavior of individual molecules?
Macroscopic Science: Thermodynamics deals with macroscopic (bulk) properties like pressure, volume, and temperature.
Averages: It is based on the average measurable properties of a large number of molecules, rather than tracking the coordinates and velocities of each mass point (which is the domain of mechanics and kinetic theory).
State-Dependent: It only cares about the initial and final states, not the rate or specific pathway of change.
Prism Memory Hook
Thermodynamics is about the FOREST (bulk), not the TREES (molecules).
System, Surroundings, and Universe
When studying a chemical reaction in a laboratory beaker, how do we correctly define the 'System', 'Surroundings', and 'Universe'?
When studying a chemical reaction in a laboratory beaker, how do we correctly define the 'System', 'Surroundings', and 'Universe'?
System: The specific part of the universe under observation (e.g., the reaction mixture inside the beaker).
Surroundings: Everything else in the universe that can interact with the system (e.g., the beaker walls, the room air).
Universe: System + Surroundings.
Boundary: The real or imaginary surface separating the system from its surroundings.
Prism Memory Hook
Universe = System + Surroundings.
Open, Closed, and Isolated Systems
What specifically distinguishes an open, closed, and isolated system when keeping a hot liquid in a container?
What specifically distinguishes an open, closed, and isolated system when keeping a hot liquid in a container?
Open System: Exchanges BOTH matter and energy (heat/work) with surroundings (e.g., open cup).
Closed System: Exchanges ENERGY (heat/work) but NOT matter (e.g., sealed copper flask).
Isolated System: Exchanges NEITHER energy NOR matter (e.g., sealed thermos flask/adiabatic walls).
Distinction: A closed system can still cool down by losing heat, while an isolated system retains its heat completely.
Prism Memory Hook
Open = All, Closed = Energy only, Isolated = None.
Also in this chapter
42 more cards to study in Prism
- 4State Variables vs. Path Functions
- 5Extensive vs. Intensive Properties
- 6Internal Energy (U)
- 7First Law of Thermodynamics
- 8IUPAC Sign Conventions for q and w
- 9Pressure-Volume Work (Irreversible)
- 10Work for Reversible Isothermal Expansion
- 11Enthalpy (H) Equation
- 12Free Expansion of an Ideal Gas
- 13Thermodynamic Reversibility
- 14Enthalpy vs Internal Energy for Gases
- 15Thermodynamic Cyclic Processes
- 16Specific Heat Capacity Equation
- 17Heat at Constant Volume vs. Pressure
- 18Mayer's Relation for Ideal Gases
- 19Standard Enthalpy of Reaction
- 20Bomb Calorimetry (Constant Volume)
- 21Standard Reference States (Zero Enthalpy)
- 22Standard Enthalpy of Formation
- 23Conventions for Thermochemical Equations
- 24Hess's Law of Constant Heat Summation
- 25Standard Enthalpy of Combustion
- 26Enthalpies of Phase Transitions
- 27Enthalpy of Solution
- 28Enthalpy of Atomization ($\Delta_a H^\ominus$)
- 29Mean Bond Enthalpy
- 30Born-Haber Cycle
- 31Entropy Change Formula
- 32Enthalpy of Dilution
- 33Gibbs Equation
- 34Spontaneity vs. Enthalpy
- 35Entropy (S)
- 36Temperature Dependence (Both Neg)
- 37Second Law of Thermodynamics
- 38Gibbs Energy and Equilibrium Constant
- 39Third Law of Thermodynamics
- 40Gibbs Free Energy (G)
- 41Spontaneity Criteria via $\Delta G$
- 42Reaction Enthalpy from Bond Enthalpies
- 43Temperature Dependence of Spontaneity
- 44Entropy of Phase Transitions
- 45Kirchhoff's Equation
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