Chemistry I
Covalent
Compounds Unit
Study Guide
Name ______________________
Teacher _____________________
Date: ____________
Period _____
Reference:
Chemistry in the Community, pp 181-183,
Notes
Naming covalent compounds worksheet
Viscosity Lab
Exploring Properties of Ionic and Covalent compounds
Vocabulary
Understand and apply the definitions of the following terms:
Covalent
Octet rule
Valence electrons
Polymers
e dot diagrams (Lewis dot diagrams)
Viscosity
Polar
Boiling points
Nonpolar
Intermolecular forces
Targeted Skills
1. Diagram a covalent molecule using a e dot diagrams (Lewis dot diagrams).
2. Know the following properties:
¾ Ionic compounds = the transfer of electron(s), i.e. “gain or lose”
Metal cations & nonmetal anion (or polyatomic ion)
Net charge = zero (criss cross charges) X +aYb- = XbYa
Dissociate (dissolve) in water
¾ Molecular compounds = sharing electrons by forming a covalent bond
2 or more nonmetals
Prefixes indicate # of each atom
Polar molecules have a δ+ & a δ Polar molecules dissolve in water
Nonpolar molecules do not have oppositely charged ends, therefore do not dissolve in water.
¾ Octet rule = atoms share, gain, or lose e- to obtain full outer energy level (usually 8 e-)
3. Name covalent compounds using prefixes: (mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca).
4. Compare/contrast the arrangement of atoms in molecules to the arrangement of atoms in ionic
compounds.
5. Describe the influence of intermolecular forces on physical and chemical properties of covalent
compounds. Example: Boiling points, viscosity, and density.
6. Be able to describe properties (boiling points, melting points, viscosity, solubility, conductivity) of
polymers, ionic crystals, metallic substances, atoms and molecules.
Make sure you remember from past tests?
Atomic structure
Significant figures
Accuracy & precision
Mixtures
Nomenclature
Revised: 6/8/06
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Solubility
Safety
Elements
Ionic compound formula writing
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Covalent Compounds Study Guide
Test Breakdown
30 Multiple-Choice Problems (max) – 70%
2 Free Response/Open-Ended Problem chosen from the Free Response/ Open-Ended Test Bank – 30%
Sample Multiple Choice Questions:
1) Intermolecular forces are strongest in:
A.
Paraffin wax: C25 H52
B.
Gasoline for autos: C8H18
C.
Hexane: C6H14
D.
Asphalt: C34H70
2) Which of the following represents atoms bonded covalently?
I. CO2
II. N2O2
III. Na2O
IV. MgBr2
V. SO3
A.
B.
C.
D.
III & IV
I, II, & V
II, & III
I & II
Sample
Mineral oil
Asphalt
Kerosene
Paraffin wax
Motor oil
Household oil
Unknown
3)
Number of
carbons
16
34
12
25
18
15
???
Viscosity rating
4
7
2
6
5
3
1
In the viscosity lab, the unknown sample would be predicted to have _____?____number of carbons.
A.
1 to 15
B.
16 to 20
C.
20 to 25
D.
25 to 30
4) A polymer is a compound that is
A.
composed of other polymers.
B.
composed of monomers.
C.
composed of carbon only.
D.
rarely a component of natural materials.
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Covalent Compounds Study Guide
5)
To describe a covalent bond, often pair of “dots” are placed between the symbols of the atoms. Which
keyword describes the behavior of the valence electrons in the bond.
A.
transferred
B.
shared
C.
converted
D.
conserved
6) Which of the following correctly names CBr4?
A.
monocarbon tetrabromide
B.
carbon tetrabromide
C.
carbon (IV) bromide
D.
monocarbon (IV) bromide
7) Which of the following formulas is correct for dinitrogen pentoxide?
A.
N2O5
B.
N5O2
C.
N2O10
D.
NO
-
Use the following electron dot diagrams, to answer the following two questions
. .
: Br .
. .
H
.
Ca
. .
.
.
Br
:
:
H
. .
:
..
N
H
Diagram A
Diagram B
8)
Diagram A illustrates what type of bonding?
A.
Covalent
B.
Ionic
C.
Metallic
D.
Intermolecular forces
9)
Which substance would have a higher boiling point?
A.
A
B.
B
C.
Can not be determined
D.
Both have the same boiling point.
10) Which pair of elements would you expect to bond covalently?
I.S
II.Ne
III.P
IV.K
A.
B.
C.
D.
..
I and II
II and III
I and III
II and IV
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Covalent Compounds Study Guide
Free Response/Open-Ended Problem Test Bank
1. Use the correct prefixes to name covalent compounds.
2. Given the name of a covalent compound write the correct formula.
3. Given a set of ionic and covalent compounds determine which are covalently bonded and which are
ionically bonded.
4. Predict which intermolecular forces would be the strongest when given experimental data.
5. Relate the type of bonding to properties( for example, melting points, boiling points, solubility) of the
compound.
6. Draw the correct Lewis structure for covalent and ionic compounds.
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