Name______________________________________________Date_____________Period_____
Bonding Review
Explain what a bond is and why it forms between two atoms.
For each of the bonds listed, explain what happens with the electrons and how each of the bonds
form.
a) Ionic
b) Covalent
c) Metallic
Compare the properties of ionic and covalent bonds in terms of crystal structure, solubility in
water/ethanol, conductivity when dissolved in water, and melting point (high or low).
What is a general rule for determining ionic from covalent bonds?
Recreate the electronegativity scale for bond types (nonpolar covalent, polar covalent, and ionic).
Be sure label which range the different bond types fall into.
Determine the bond type (nonpolar covalent, polar covalent or ionic) for each of the following:
a) HCl
b) CO
c) NaCl
d) Br2
e) ClF
f) MgO
g) CH
h) NF
For the previous bonds, draw the bond dipole if it applies.
a) HCl
b) CO
c) NaCl
d) Br2
e) ClF
f) MgO
g) CH
h) NF
What is the main idea behind VSEPR theory?
For each of the following molecules:
a) Draw the Lewis dot structure
b) Identify the VSEPR ABE formula
c) Indicate the shape
d) Draw the shape
e) Indicate bond polarities
f) Indicate overall polarity of the molecule (if it applies)
SiS2
CCl4
BI3 (Boron is an exception – only 6 e- surround it)
H3O+
HCN
CO32-
NO2-1
Explain how shared electrons change as you go from single to double to triple bonds.
Rank single, double, and triple bonds according to increasing:
a) Bond length
b) Bond Strength
c) Bond Energy
A student came across two white powders for which the bond type (ionic or covalent) had to be
determined. First the student looked at the powders under a microscope. The student observed
that the crystals in powder A were very different compared to one another. When powder B was
observed, every crystal had the same exact shape. Next the student attempted to dissolve the
powders in ethanol and water. Powder A dissolved in ethanol but not water while Powder B
dissolved in water and not ethanol. The student also discovered that when Powder B was
dissolved in water it conducted electricity while powder A did not. The student also determined
that powder A melted at 159.0 °C while powder B melted at 801 °C
Determine the bond type found in powder A and powder B. Explain how you know.