SLO 4.1 Molecular Interactions

Students will use knowledge of molecular composition and geometry to describe molecular interactions

:key: Key Concepts and Skills

  • Specific Heat Capacity: Explain the differences between heat and temperature. Describe how specific heat capacity is related to the temperature of a substance.
  • Intermolecular Forces: Define, give examples of, and rank relative strength of the various molecular attractions known collectively as “intermolecular forces”: dispersion, dipole-dipole attractions, and hydrogen-bonding. Describe the difference between intermolecular and intramolecular forces.
  • Heat of Vaporization/Fusion: Describe the relationship between intermolecular forces, phase changes, and heat of vaporization and heat of fusion.
  • Heating Curve: Describe the components of a heating curve and explain what it represents. Do this by describing the observed differences in heat exchange due to changes in temperature and bond making/breaking process
  • Predict Properties of Molecules: Predict the relative boiling/melting point of a substance and explain trends based on intermolecular forces. Evaluate errors with statements made about intermolecular forces in molecules and predictions of boiling points and trends

:books: Reading

  • From the textbook:
    • 7.3 The First Law of Thermodynamics: There Is No Free Lunch
    • 7.4 Quantifying Heat and Work
    • 7.6 Enthalpy: The Heat Evolved in a Chemical Reaction at Constant Pressure
    • 7.7 Constant-Pressure Calorimetry: Measuring ΔHrxn
    • 12.2 Solids, Liquids, and Gases: A Molecular Comparison
    • 12.3 Intermolecular Forces: The Forces That Hold Condensed States Together
    • 12.5 Vaporization and Vapor Pressure
    • 12.6 Sublimation and Fusion
    • 12.7 Heating Curve for Water
  • POGIL Activities
    • CA-25: What Determines a Boiling Point?
    • CA-J: What Factors Affect the Amount of Heat Transferred to a System?
  • Other:

:paperclip: Important Terms

Intermolecular Forces Heat Curve
Intramolecular Forces Heat Capacity
Dispersion forces Fusion
Dipole-Dipole forces Vaporization
Hydrogen Bonding Freezing
Ion-Dipole forces Condensation
Molecular Dipole Enthalpy

:memo: Sample Assessment Questions

Sample assessment questions for CHEM 1340 SLO 4.2

:movie_camera: Dr. Thompson Videos

  • IMF Identification

  • IMFs and Boiling Points

  • IMF Identification - Dipoles and Polarity

  • Heating Curves

:headphones: External Videos, Tutorials, Simulations

:pencil2: Practice Problems

  • From the textbook:
    • Chapter 7: 17, 19, 39, 45, 69, 75
    • Chapter 12: 1, 3, 4, 6, 18, 19, 31, 32, 37-39, 43-45, 58
  • From other external sources:
    • N/A
  • From Dr. Thompson (links and embedded versions below):

:rewind: Back to CHEM 1340