Name Section
Pre-laboratory Questions
1. What is the octet rule?
2. How many electrons compose a single covalent bond?
3. What type of elements (metals, nonmetals, or a combination) compose covalent compounds?
4. Which electrons (all, core, or valence) are represented by the Lewis symbol?
5. What determines the polarity of a molecule?
6. What is the term for the amount of attraction of an atom for electrons in a bond?
7. What type of bond occurs between atoms having nearly equal attraction for the electrons?
8. What is the difference between a polar molecule and a nonpolar molecule?
9. When is a three-atom linear molecule nonpolar?
10. Why is shape so important to a molecule?
Name
H2O
Cl2O
H2S
SeF2
Total number of valence
electrons
Lewis Structure
Total regions of
electrons
Number of bonding
regions of electrons
Pairs of nonbonding
electrons
Shape
Polar?
GeO2
SiO2
CS2
SiSe2
Total number of valence
electrons
Lewis Structure
Total regions of
electrons
Number of bonding
regions of electrons
Pairs of nonbonding
electrons
Shape
Polar?
PI3
NBr3
PF3
AsF3
Total number of valence
electrons
Lewis Structure
Total regions of
electrons
Number of bonding
regions of electrons
Number of pairs of
nonbonding electrons
Shape
Polar?
CBr4
SiCl2H2
GeF4
SnCl4
Total number of valence
electrons
Lewis Structure
Total regions of
electrons
Number of bonding
regions of electrons
Number of pairs of
nonbonding electrons
Shape
Polar?
Further questions
1. While objects such as marshmallows could be used, what is the advantage of using the model kit to
make the molecules?
2. Explain why water is a bent (angular) shape, but why it is easy to think it is linear without the model.
3. Explain what property of water depends on it being bent(angular).
4. Explain why the kit used for making molecular compounds would not work for ionic compounds.
