8.2. Ionic Bonds and Ionic Compounds http://www.ck12.org
Lesson Review Questions
- How do the electrons from two atoms interact in an ionic bond?
- Predict the formulas for the ionic compounds formed when each of the metals in theTable8.3 reacts with
each nonmetal.
TABLE8.3:Reactions
Oxygen Sulfur Chlorine
Calcium
Sodium
Aluminum- What is dissolution?
- If sodium chloride is placed in water, it will completely dissociate into its ionic components, described by
the dissociation equation: NaCl(s)→Na+(aq)+Cl−(aq). (The (aq) signifies an aqueous solution, or a solution in
which the ions are dissolved in water.) Write a similar dissociation equation for the solid ionic compound
calcium chloride. - Which physical properties of ionic compounds can be attributed to the crystal lattice structure?
- How does lattice energy relate to the strength of an ionic compound?
- True or false: The high melting points of ionic solids suggest that ionic bonds are fairly weak.
- UsingTable8.1 as a reference, what trend can be recognized between lattice energy and the characteristics of
the ions which comprise the compound? For example, NaF, NaCl, NaBr, NaI have lattice energies (kJ/mol)
of 910, 788, 732, and 682, respectively. What is different between the anions that may be causing such
differences?
Further Reading / Supplemental Links
- Animation of Sodium chloride dissolution: http://www.mhhe.com/physsci/chemistry/essentialchemistry/fla
sh/molvie1.swf
Points to Consider
- We have generally assumed that ionic compounds are composed of metal cations and nonmetal anions. While
this is common, there are ionic compounds in which no metal is involved. For example, the ammonium cation
is positively charged but does not involve any metal atoms. Similarly, some polyatomic anions are not solely
comprised of nonmetallic atoms. What are some examples of these anions?