Unit 6
Review Worksheet
1. Individual atoms of elements are ( more / less ) stable than when they are
combined with
other elements.
2. What is the difference between ionic and
covalent bonding?
3. What is the cut-off number for the difference
in electronegativity to determine whether a
bond is ionic or covalent?
4. Between what types of elements does ionic
bonding occur?
5. Between what types of elements does polar
covalent bonding occur? Nonpolar covalent?
6. What should you do with any left over electrons when drawing Lewis structures?
7. What should you do if you have used all of
the electrons and the central atom still does not
have 8 electrons?
8. How can you tell which is the central atom by
looking at the chemical formula?
9. What two (2) requirements must a molecule
meet in order to be considered nonpolar?
10. What do “A”, “B”, and “E” stand for when
determining the class of a molecule?
11. What does the subscript “2” mean in the class
AB2E?
12. Which classes of molecules have a bent shape?
13. Which class of molecules has a linear shape?
14. Which class has a tetrahedral shape?
15. Which class has a trigonal
planar shape?
16. Which class has a trigonal
pyramid shape?
17. What is the smallest unit of an ionic
compound called? A
covalent compound?
18. Which type of compound has low melting points?
19. Which type of compound dissolves in water?
20. Which type of compound conducts electricity
when melted?
21. Which type of compound occurs as liquids,
gases, or non-crystalline solids?
22. What are the four types of intermolecular
forces?
23. Between which types of compounds do these
intermolecular forces occur?
24. Arrange the following in order of increasing
strength:
(A) hydrogen bonding (B)
covalent bonding (C)
dipole-dipole forces
(D)
London
dispersion forces (E) dipole-induced
dipole forces
25. For each of the following compounds, draw the
Lewis structure. Then tell the molecular
polarity,
class, and shape of the molecule. Also tell the type(s) of IM forces that occur
within
a sample of that compound.
(A) SiF4
(B) SBr2
(C) NH3
(D) SO3
(E) SiO2
(F) SeS2
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