SLO 1.3 - Energy, Enthalpy, and the First Law of Thermodynamics

Key Concepts and Skills

• System and surroundings: Interpret the meaning of sign (+ or -) on heat, work and internal energy Path and state functions: Describe the difference between state functions (internal energy) and path function (heat and work)
• Calorimetry: Use the principles of constant-pressure calorimetry to calculate heats of combustion
• Heat capacity: Leverage the relationship between internal energy, enthalpy, and heat capacities to solve for various quantities. Comment on the relationship between heat capacities for perfect (ideal) and non-perfect gases.
• Reversibility: Compare quantities like “work performed” in reversible and irreversible processes.
• Processes: Calculate the change in internal energy, enthalpy, heat, and work for various processes (i.e. reversible, isothermal compression)
• Adiabatic: Relate values of pressure, volume, and temperature in an adiabatic expansion or compression process
• Exact Differentials: Manipulate the exact differentials for enthalpy and energy to solve for various parameters and relate to measurable quantities (i.e. Joule-Thomson coefficient)

Reading

• From the textbook:
  • Chapter 2
• POGIL Activities
  • Fundamental 6: Work
  • Fundamental 10: Processes
• Other:
  • Reversible vs. Irreversible Processes
  • Adiabatic Processes
  • Adiabatic Processes
  • Engel and Reid (alternative textbook): Chapter 2
  • McQuarrie (alternative textbook): Chapter 19

Important Terms

Sample Assessment Question

External Videos, Tutorials, Simulations

• Joule-Thomson Simulation
• PhET - Reversible Processes
• Isothermal Expansion
• P-V Diagrams
• Work in Reversible vs. Irreversible Process

Practice Problems

• From the textbook:
  • Exercises: 2A.5, 2B.2, 2C.5, 2C.6, 2D.1, 2D.5, 2E.2
  • Problems: 2A.1, 2B.3, 2D.8, 2E.1
• From other external sources:
  • Reversibility

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