Warmup – write out the answer
• Identify these compounds as covalent or ionic
1.
2.
3.
4.
SiO2 is _____
FeS2 is _____
cobalt(III) chlorate is _______
H2O is _______
• An ionic bond is____
a) metal cations attraction to free floating valence
electron cloud.
b) non-metal elements sharing their electrons to make
an octet
c) the attraction between cations and anions
Objective
6.5
•To know the properties of
covalent compounds.
•To be able to write
names for covalent
compounds
What is the objective for
today?
A. to learn properties of covalent
compounds
B. to learn how to name covalent
compounds
C. to learn as little as possible
D. both A and B are correct
An Ionic bond is…..
A. metal cations attraction to free
floating valence electron cloud.
B. non-metal elements sharing their
electrons to make an octet
C. the attraction between cations and
anions
Which of these
compounds is ionically
bonded?
A. Si3O2
B. FeS2
C. cobalt(III) chlorate
D. H2O
cobalt(III) chlorate
Where do you find the
formula and charge for
‘chlorate’
A. From the list on the back of your
periodic table: ClO3 charge is -1.
B. it must be Cl8 for chlorine eight
C. Chlorate is Cl-
I.
What is a Covalent Compound?
A covalent compound is a compound
composed of molecules.
A molecule is a neutrally bonded group
of atoms that act as a unit.
Some examples of covalent
compounds:
H2O
NO2
Water
nitrogen dioxide
 Millions of the same molecules grouped
together make up a covalent compound.
Unlike ionic
compounds, covalent
compounds are
composed of only
nonmetallic elements.
What elements are covalent
compounds composed of?
A. metals only
B. non-metals only
C. metals and non-metals
D. cations and anions
Covalent (molecular) compounds:
– Relatively low melting and boiling points
– Exist as gas or liquids at room temperature
– Poor conductors of electricity
Which is true about the
properties of covalent
compounds?
A. form crystals at room temperature
B. relatively low melting point, usually
gas or liquid at room temperature
C. poor conductors of electricity
D. good conductors of electricity
[
 When more than one nonmetallic element
combines, they can do so in more than one way.
CO
CO2
 These two covalent compounds are composed of
the same two elements, but they have completely
different chemical properties.
 What problem does this present when trying to
distinguish between these two compounds?
CO
CO2
 These two covalent compounds are composed of
the same two elements, but they have
completely different chemical properties.
 What problem does is presented when trying to
distinguish between these two compounds?
Naming them
Two covalent compounds:
SO2 and SO3
Would you expect them have
the same chemical properties?
A. Yes
B. No
 What name would be given to CO and CO2 using
the same naming rules for ionic compounds?
 What name would be given to CO and CO2 using
the same naming rules for ionic compounds?
Carbon Oxide
 But which one gets to use this name?
 Obviously, a new naming system is needed for
covalent compounds.
 Obviously, a new naming system is needed for
covalent compounds.
 When naming covalent compounds, prefixes are
used to distinguish between different compounds.
 These prefixes
indicate the number
of atoms of each
element used to
compose a particular
molecule.
Prefix
Number
Mono-
1
Di-
2
Tri-
3
Tetra-
4
Penta-
5
Hexa-
6
Hepta-
7
Octa-
8
Nona-
9
Deca-
10
• What name would you now give to CO and CO2
using prefixes?
CO
CO2
• What name would you now give to CO and CO2
using prefixes?
CO
Carbon Monoxide
CO2
• What name would you now give to CO and CO2
using prefixes?
CO
Carbon Monoxide
CO2
Carbon Dioxide
1. Usually, if there is only one of the first
element, the prefix mono- is omitted.
1. Usually, if there is only one of the first
element, the prefix mono- is omitted.
2. The names of all covalent binary
compounds end with –ide.
1. Usually, if there is only one of the first
element, the prefix mono- is omitted.
2. The names of all molecular binary
compounds end with –ide.
3. The vowel at the end of the prefix is
sometimes dropped when the name of the
element also begins with a vowel.
• Name the following covalent compounds.
1. SF2
2. PCl3
3. CCl4
4. Cl2O8
• Name the following covalent compounds.
1. SF2
Sulfur Difluoride
2. PCl3
3. CCl4
4. Cl2O8
• Name the following covalent compounds.
1. SF2
Sulfur Difluoride
2. PCl3
3. CCl4
4. Cl2O8
Phosphorus Trichloride
• Name the following covalent compounds.
1. SF2
Sulfur Difluoride
2. PCl3
Phosphorus Trichloride
3. CCl4
Carbon Tetrachloride
4. Cl2O8
• Name the following covalent compounds.
1. SF2
Sulfur Difluoride
2. PCl3
Phosphorus Trichloride
3. CCl4
Carbon Tetrachloride
4. Cl2O8
Dichlorine Octoxide
• Write the chemical formula using the
following compound names.
5. Nitrogen triodide
6. Diselenium dichloride
7. Dinitrogen tetroxide
8. Sulfur trioxide
• Write the chemical formula using the
following compound names.
5. Nitrogen triodide
NI3
6. Diselenium dichloride
7. Dinitrogen tetroxide
8. Sulfur trioxide
• Write the chemical formula using the
following compound names.
5. Nitrogen triodide
NI3
6. Diselenium dichloride
7. Dinitrogen tetroxide
8. Sulfur trioxide
Se2Cl2
• Write the chemical formula using the
following compound names.
5. Nitrogen triodide
NI3
6. Diselenium dichloride
Se2Cl2
7. Dinitrogen tetroxide
N2O4
8. Sulfur trioxide
• Write the chemical formula using the
following compound names.
5. Nitrogen triodide
NI3
6. Diselenium dichloride
Se2Cl2
7. Dinitrogen tetroxide
N2O4
8. Sulfur trioxide
SO3