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CHEM1101 - Resources for Week 6

Topics and Learning Outcomes

  • Ionic Bonding
    •  describe and explain the periodic trends in electronegativity
    •  explain the origin of ionic bonding
    •  explain why ionic interactions lead to crystals rather than small molecules
    •  explain the meaning of the term “lattice energy”
    •  understand how the lattice energy is influenced by size and charge of the ions
    •  explain how ionic radii influence crystal structure, and why they differ from atomic radii
  • Lewis Structures
    •  draw out plausible Lewis structures for simple polyatomic molecules
    •  assign bond orders based on sharing of electron pairs, resonance structures and formal charges
    •  explain the relationship between resonance and electron delocalisation in molecular orbitals
  • Molecular Shape
    •  describe the electron pair geometries and molecular shapes for molecules containing between 2 and 6 electron pairs
    •  assign molecular shapes based on Lewis structures and VSEPR theory
    •  explain the difference between polar bonds and polar molecules
    •  predict, based on molecular shape, whether a molecule will have a net dipole moment
    •  identify carbon-carbon single, double and triple bonds
    •  determine whether a molecule is polar

Textbook and eBook References

  • Ionic Bonding - Sections 5.2 and 7.2
  • Lewis Structures - Section 5.3
  • VSEPR - Sections 5.4 and 5.5
the eBook references are free and are taken from high quality sources.

Lecture Notes, Tutorial Worksheets & Answers and Suggested Exam Questions

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ChemCAL and iChem Resources

Contributed Links and Resources

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Ionic Bonding -  
Lewis Structures -  
  Oxidation numbers  
Tags: oxidation numbers  |  Contributed by Adam Bridgeman
  Lewis structures (interactive structure maker)  
Description: Interactive approach to building Lewis structures
Tags: Lewis structures  |  Contributed by Adam Bridgeman
  Drawing the Lewis structure of the sulfate ion  
Tags: Lewis structure | formal charges  |  Contributed by Alice Williamson
  Drawing Lewis Structures (short video tutorial)  
Description: Video tutorial
Tags: lewis structures  |  Contributed by Elizabeth New
  Molecular Shapes Interactive Simulation  
Description: Simulates model and real molecules, both shape and electron arrangement.
Contributed by Chiara Neto
  Molecular shape and dipoles (short video tutorial)  
Description: Video tutorial on how to work out if a molecule is polar or not.
Tags: VSEPR | Lewis structures  |  Contributed by Chiara Neto

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