The Structure of Compounds

  1. Consider the following substances:

    lead (II) bromide lithium chloride potassium iodide sugar hydrogen chloride sulfur copper

  2. Take a look at the properties of two bromine-containing compounds:
    1. hydrogen bromide, HBr,
    2. sodium bromide, NaBr.

    Electrical Conductivity
      Solid Liquid Aqueous Solution
    HBr very low very low
    NaBr very low high

  3. Describe the trends in the electronegativities of the elements across a row and down a column of the periodic table.
  4. Which element in the periodic table has the largest electronegativity?
  5. Which element in the periodic table has the smallest electronegativity?
  6. Arrange the following elements in order of decreasing electronegativity.

  7. Explain why CO2 has no dipole moment.
  8. Explain why H2O is a polar molecule.
  9. Explain why I2 is a nonpolar covalent compound.


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Chemistry Department
British Columbia Institute of Technology, Burnaby, B.C. Canada.
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