Fundamentals of Molecular Interactions and Phase Behavior

From the study guide

Course Outline

  1. Adhesion and Cohesion
  2. Colloidal Systems
  3. Ligands and Complexes
  4. Diffusion Processes
  5. Phases and Boundaries
  6. Gibbs Rule of Phases
  7. Critical and Vaporization
  8. Colligative Properties
  9. Gas Laws and Properties
  10. Reaction Kinetics and Catalysis
  11. Chemical Equilibrium and Le ChΓ’telier
  12. Thermodynamic Systems

1. Adhesion and Cohesion

Key Concepts & Definitions

  • Adhesion: The force of attraction between molecules of different substances at their interface, e.g., glue sticking to paper.
  • Cohesion: The force of attraction between molecules of the same substance, maintaining its integrity, e.g., water molecules sticking together.
  • Colloidal System: A heterogeneous mixture where one substance is dispersed evenly within another, with particles larger than molecules but small enough to remain suspended.
  • Ligand: A molecule, ion, or atom that binds to a central atom to form a chemical complex.
  • Diffusion: The spontaneous movement of molecules from an area of higher concentration to an area of lower concentration, occurring in gases, liquids, and solids.
  • Phase Boundary: A thin interface layer separating two different phases in a system, e.g., liquid-liquid interface.

Essential Points

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Practice quiz preview

1. What does adhesion refer to in molecular interactions?

2. What is the size range of particles typically found in colloidal systems?

3. What is the primary role of ligands in the formation of complexes?

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Flashcard preview

Adhesion β€” definition?

Attraction between different substances' molecules.

Colloidal system β€” particles?

Particles 1-1000 nm dispersed in a medium.

Ligand β€” role?

Binds to a central atom to form complexes.

Adhesion β€” definition?

Attraction between different substances at interface.

Cohesion β€” role?

Attraction between same molecules, maintains substance integrity.

Colloidal System β€” composition?

Heterogeneous mixture with particles 1-1000 nm.

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