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For more information, please see full course syllabus of Chemistry
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Types of Solids, X-Ray Diffraction, Unit Cells

  • Crystalline solids ordered: test is X-ray diffraction; fracture along planes

  • Amorphous solids; not ordered; fracture along curves e.g. glass

  • Types of crystalline solid include metals; ionic crystals like NaCl; molecular crystals like sucrose; network solids like diamond, quartz

  • Bragg’s Law gives structures from X-ray diffraction

  • Unit cell represents symmetry of whole crystal by abstracting a small portion

  • Simple cubic, face-centered cubic, and body-centered cubic unit cells; learn how to draw each

  • Unit cell contents and densities of materials; master connections between atomic radii, unit cell dimensions, and density

  • First Law of Thermo and formation of ionic crystals from elements, e.g. NaCl

  • Lattice energy and relationship to constitution of ionic crystals

Types of Solids, X-Ray Diffraction, Unit Cells

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Solids: Crystalline and Amorphous 0:59
    • X-Ray Diffraction
  • Types of Crystalline Solids: Atomic 5:39
    • Example: Metallic Copper
  • Types of Crystalline Solids: Ionic Crystal 7:20
    • Example: NaCl
  • Types of Crystalline Solids: Molecular Crystal 11:30
    • Example: Ice
  • Types of Crystalline Solids: Network Solid 13:22
    • Example: Carbon Allotropes (Diamond and Graphite)
  • X-Ray Diffraction and Bragg's Law 18:26
    • Bragg's Law Equation
  • Unit Cell 26:55
    • Simple Cubic Unit Cell
  • Face-Centered and Body-Centered Unit Cells 31:06
    • Body-Centered Cubic
    • Face-Centered Cubic
  • Unit Cell and Densities of Crystalline Solids 36:13
    • Example: Platinum
  • First Law of Thermodynamics and Lattice Energy 42:14
    • Example: NaCl
  • Lattice Energies and Constitutions of Ionic Solids 47:33
  • Additional Example 1