Unit #1Unit #2Unit #3Unit #4Unit #5Unit #6Unit #7Unit #8Unit #9Unit #10
spacerUNIT # 5  
spacerspacerIntroduction
spacerspacerObjectives
spacerspacerReading


spacer5.1 Ionic
spacerBonding

spacerIonic Bonding in Sodium Chloride
spacerIonic Bonding in Magnesium Chloride
spacerProperties of Ionic Compounds
spacer5.2 Covalent
spacerBonding
spacer5.3 Polar Covalent
spacerBonding

spacer5.4 Bond
spacerDipoles

spacer5.5 Electroneg-
spacerativity

spacer5.6 Classification
spacerof Bond Type
spacer5.7 Polarity of
spacerMolecules
spacer5.8 Writing
spacerChemical
spacerFormulae
spacerWriting formulas containing simple ions
spacerWriting formulas containing  polyatomic ions
spacerUsing parentheses in formula writing
spacer5.9 Information in
spacera Chemical
spacerFormula
spacerNumber ratio of atoms
spacerNumber ratio of ions
spacer5.10 Oxidation
spacerNumbers
spacerAssignment of Oxidation Numbers


spacerspacerProblems
spacer1 | 2

Unit #5 COMPOUNDS

5.1 - Ionic Bonding

5.1.3 - Properties of Ionic Compounds

Some general points can be made about ionic compounds:

  • The smallest unit of an ionic compound is a formula unit. The mass of this formula unit is called the formula mass.
    ( We will discuss more about formula mass in section 7.1.)
    • The formula unit of sodium chloride is NaCl. It has a formula mass is 58.44 amu/formula unit.
    • The formula unit of sodium chloride is MgCl2. It has a formula mass is 95.21 amu/formula unit.

  • The strong attractions between the cations and the anions in ionic solids are responsible for their high melting points. For ionic compounds, melting points typically range from 300oC to 1000oC.
  • Ionic compounds are soluble in water.
  • In aqueous solution, an ionic compound dissociates into its ions.
    • This means that when NaCl is dissolved in water, the solution contains Na+ ions and Cl- ions.

  • The dissociated ions in aqueous solution gives the solution the ability to conduct electricity. Therefore, ionic compounds dissolved in water makes strong electrolytes.

Section 6.4
The Ionic Bond ..p124

Back



All contents copyrighted © 1996-2006
British Columbia Institute of Technology
Chemistry Department - 3700 Willingdon Avenue
Burnaby, B.C. Canada V5G 3H2