Unit 7 – Bonding
Study Guide
AP Chemistry
1. Draw Lewis dot structures for:
a. Ca
b. Si
c. Br
2. Mg+2 is an ion that has noble gas electron configuration. Write the formula for 2 others.
3. Write formulas for ionic compounds:
a. Magnesium and chlorine
b. Aluminum and sulfur
4. What is bond order? What is the bond order of C-O in CH2O?
5. Predict size of lattice energy. Which compound from a list would have the highest lattice energy?
6. How many covalent bonds will each form?
a. P
b. Si
c. Cl
7. Know the trend for electronegativity.
8. What type of elements (metals/nonmetals) make up ionic bonds? Covalent bonds?
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9. Answer the next questions about the following bonds:
S-Cl
Si-Cl
P-Cl
Si-Si
C≡C
C=C
a. Which are nonpolar?
b. Which is the most polar?
c. Which is shortest?
d. Which is strongest?
10. Which elements are exceptions to the octet rule?
11. What is the correct structural formula for 1 – propyne?
After completing the table on page 3 (#16), answer questions 12 - 15:
12. How many valence electrons are shown in the Lewis structure of NO2+1?
13. How many pairs of electrons are there around Xe in XeF4?
14. How many pairs of electrons are there around the central atom in the Lewis structure of ICl 2-1?
15. How many sigma and pi bonds are in CO3-2?
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16. Complete the Table:
Compound
Lewis Structure(s)
VSEPR
Geometry
Central
atom
hybrid.
Bond
angles
Polar or
nonpolar
NO2+1
CO3-2
XeF4
ICl2-1
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17. Be able to look at a list of compounds and determine which has the greatest dipole moment. See Ex. 10.5.
18. Know geometry, bond angles, and hybridization for ALL possible Lewis structures, not just the ones
represented in #16. Refer to the Prelab on the Molecular geometry lab for a complete list/table.
19. Calculate enthalpies of bonds. See Ex. 9.14. Try out 9.14 A on p. 370.
20. Be able to identify which intermolecular forces are present in a compound. Draw the structures for water,
carbon tetrachloride, and phosphorus trichloride. Which intermolecular forces are present and which is
strongest?
21. What is the order of strength for intermolecular forces? Be able to identify which compound would have
the highest or lowest melting or boiling point. Of the three compounds drawn in #20, what would be the
expected order of melting from lowest to highest?
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