Agenda Jan 13, 2017
Slip quiz 1
Naming Molecular Compounds - Pogil to finish (will turn in)
Polyatomic Ions - Pogil, start together.
Independent practice.
Slip Quiz: 1) Name the following
molecular (covalent) compounds.
N2F2
SCl4
SO3
2) Write molecular formulas for the following
compounds: Disulfur decafluoride;
dinitrogen trioxide
Slip Quiz: 1) Name the following
molecular (covalent) compounds.
N 2F 2
dinitrogen difluoride
Slip Quiz: 1) Name the following
molecular (covalent) compounds.
SCl4
sulfur tetrachloride
Slip Quiz: 1) Name the following
molecular (covalent) compounds.
SO3
sulfur trioxide
Slip Quiz: 1) Name the following
molecular (covalent) compounds.
2) Write molecular formulas for the following
compounds:
Disulfur decafluoride;
S2F10
Slip Quiz: 1) Name the following
molecular (covalent) compounds.
dinitrogen trioxide
N 2O 3
Naming Molecular
Compounds
Extension Questions
19.
This activity focused on molecular (covalent)
compounds, whilst an earlier activity addressed ionic
compounds. Notice that the formulas for both types of
compounds can look very similar, even though their
names are quite different.
Identify 2 differences between the names or formulas
for ionic compounds versus those for binary molecular
compounds. Also identify 2 similarities.
Chemical Formula
Type of Compound/Bonding
Compound Name
MgF2
ionic
Magnesium fluoride
CuF2
ionic
Copper(II) fluoride
SF2
covalent
Sulfur difluoride
NaBr
ionic
Sodium bromide
AuBr
ionic
Gold(I) bromide
IBr
covalent
Iodine monobromide
Names and
Formulas of
Ionic
compounds
Differences
similarities
Names and
formulas of
molecular
(covalent)
compounds
Names and Formulas of
Ionic compounds
Differences
similarities
Names and formulas of
molecular (covalent)
compounds
Contain metals Contain
and nonmetals nonmetals and
nonmetals
Differences
Names and Formulas of
Ionic compounds
Names and formulas of
molecular (covalent)
compounds
Contain metals and
nonmetals
Contain nonmetals and
nonmetals
No prefixes used in Prefixes are used
names
in naming
similarities
Differences
Names and Formulas of
Ionic compounds
Names and formulas of
molecular (covalent)
compounds
Contain metals and
nonmetals
No prefixes used in
names
Contain nonmetals and
nonmetals
Prefixes are used in
naming
Roman numerals
No roman
are used (for metal numerals are used
ions that form
multiple ions - with
different charges)
similarities
Differences
Names and Formulas of
Ionic compounds
Names and formulas of
molecular (covalent)
compounds
Contain metals and
nonmetals
No prefixes used in
names
Roman numerals are
used (for metal ions that
form multiple ions - with
different charges)
Contain nonmetals and
nonmetals
Prefixes are used in
naming
No roman numerals are
used
Charges have to
be taken into
account when
writing formulas
No charges to
consider during
writing of formulas
Differences
similarities
Names and Formulas of
Ionic compounds
Names and formulas of
molecular (covalent)
compounds
Contain metals and nonmetals
No prefixes used in names
Roman numerals are used (for
metal ions that form multiple ions
- with different charges)
Charges have to be taken into
account when writing formulas
Contain nonmetals and
nonmetals
Prefixes are used in naming
No roman numerals are used
No charges to consider during
writing of formulas
Contain only 2 elements (binary)
Differences
similarities
Names and Formulas of
Ionic compounds
Names and formulas of
molecular (covalent)
compounds
Contain metals and nonmetals
No prefixes used in names
Roman numerals are used (for
metal ions that form multiple ions
- with different charges)
Charges have to be taken into
account when writing formulas
Contain nonmetals and
nonmetals
Prefixes are used in naming
No roman numerals are used
No charges to consider during
writing of formulas
Contain only 2 elements (binary)
-ide ending for second element
(nonmetal)
Differences
similarities
Names and Formulas of
Ionic compounds
Names and formulas of
molecular (covalent)
compounds
Contain metals and nonmetals
No prefixes used in names
Roman numerals are used (for
metal ions that form multiple ions
- with different charges)
Charges have to be taken into
account when writing formulas
Contain nonmetals and
nonmetals
Prefixes are used in naming
No roman numerals are used
No charges to consider during
writing of formulas
Contain only 2 elements (binary)
-ide ending for second element
(nonmetal)
More electronegative element is
always placed second
20. Use complete sentences to explain
why AlCl3 is called aluminum chloride,
but BCl3 is called Boron trichloride.
Write an answer.
Read it to your shoulder partner.
Listen to their response.
Edit to get the best of your ideas.
Write your best answer - both of you.
Practice saying it out loud - both of you.
Flowchart for naming binary compounds
21. In the table below, first identify the
type of bonding present in each
compound. Then fill in the missing name
or formula for each compound using the
appropriate set of rules.
To be turned in - 10 minutes (very
generous amount of time, don’t dilly
dally)
Chemical Formula
Type of compound/bonding
Compound name
CS2
PbI2
BaCl2
Se2S6
Xenon tetrafluoride
Sodium phosphide
Dinitrogen pentoxide
Cobalt(III) bromide
Chemical Formula
Type of compound/bonding
Compound name
CS2
covalent
Carbon disulfide
PbI2
ionic
Lead(II) iodide
BaCl2
ionic
Barium chlroide
Se2S6
covalent
Diselenium hexasulfide
XeF4
covalent
Xenon tetrafluoride
Na3P
ionic
Sodium phosphide
N 2O 5
covalent
Dinitrogen pentoxide
CoBr3
ionic
Cobalt(III) bromide
Polyatomic Ions
Can a group of atoms have a charge?
Obviously, yes - we came across “borate”
anions during our lab this week and have
noticed other groups of atoms in () in
formulas when balancing equations.
Why?
Do you know you eat a lot of “ates”? Next
time you look at a food label, read the
ingredients and you will likely find a number
of ingredients that end with “-ate,” such as
sodium phosphate or calcium carbonate. Did
you ever wonder what the chemical formulas
of those ingredients look like? In this activity
we will explore polyatomic ions, which are
Polyatomic ions
Are groups of atoms that carry a charge.
These ions are found in our food ingredients,
natural waterways, and many other chemical
compounds you encounter every day.
Model 1 - Types of Ions
Monatomic ions
Nitride N3- Sulfide S2- Chloride Cl-
Polyatomic ions
Nitrate NO3-
Sulfate SO42-
ammonium NH4+
Nitrite NO2-
Sulfite SO32-
hydroxide OH-
-
1. Use model 1 to complete the table below
Name of ion
Charge on
ion
Type and
number of
atoms
Chemical
formula
nitride
nitrate
sulfate
sulfite
ammonium
1. Use model 1 to complete the table below
Name of ion
nitride
nitrate
sulfate
sulfite
ammonium
Charge on
ion
3-
1-
2-
2-
1+
Type and
number of
atoms
1N
1N, 3O 1S, 4O
1S, 3O
1N, 4H
Chemical
formula
N3-
NO3-
SO42- SO32- NH4+
2. Consider the terms “monatomic” and
“polyatomic” as they are used in Model
1. Write a definition for each of these
terms.
(Discuss quickly - agree with your
partner- be ready to share.)
2. Consider the terms “monatomic” and
“polyatomic” as they are used in Model
1. Write a definition for each of these
terms.
Monatomic means there is only one
atom present in the ion, whereas
polyatomic ions contain many atoms.
3. What types of elements (metals or
nonmetals) are shown in the polyatomic
ions in Model 1?
3. What types of elements (metals or
nonmetals) are shown in the polyatomic
ions in Model 1?
Nonmetals.
4. What types bonds (ionic or covalent)
hold the atoms together in polyatomic
ions? Explain your reasoning.
Since polyatomic ions consist of groups of
nonmetal ions bonded together, the bonds
must be covalent ones where electrons are
being shared.
5. The net charge on a sulfide ion is 2-.
Explain how this ion obtains its charge.
Sulfur is in group 16 on the periodic table and
has 6 valence electrons and when it forms
ions it gains two electrons to achieve a stable
octet of valence electrons. With two additional
electrons the new ion, called a sulfide ion, has
a net charge of 2-.
6. The dotted line around each
polyatomic ion in Model 1 shows that the
group of atoms has a charge.
The charge is not on any one atom, but rather
on the group of atoms as a whole.The net
charge on a polyatomic ion must be a result of
extra electrons (for anions) or fewer electrons
(for a cation) compared to the total number of
protons in all of the atoms involved.
7. What are the similarities and
differences between the nitrate and
nitrite ions in Model 1?
Both have 1- charge; both contain N and O
Nitrate has 3 oxygen atoms
Nitrite has 2 oxygen atoms
8. What are the similarities and
differences between the sulfate and
sulfite ions in Model 1?
Both have 2 - charge; both contain S and O
sulfate has 4 oxygen atoms
sulfite has 3 oxygen atoms
9. The “chlorate” polyatomic ion has a
charge of -1 and is composed of one
chlorine atom (the central atom) and
three oxygen atoms.?
a) Draw a model of a chlorate ion.
Cl
9. The “chlorate” polyatomic ion has a
charge of -1 and is composed of one
chlorine atom (the central atom) and
three oxygen atoms.?
a) Draw a model of a chlorate ion.
O
O
Cl
O
9. The “chlorate” polyatomic ion has a
charge of -1 and is composed of one
chlorine atom (the central atom) and
three oxygen atoms.?
a) Draw a model of a chlorate ion.
O
O
Cl
O
1-
b) Write the chemical formula for the
chlorate ion, including its charge:
ClO3
a) Draw a model of a chlorate ion.
O
O
Cl
O
1-
10. What do we think “chlorite” will look
like? (Discuss - be ready to share).
a) Draw a model of a chlorate ion.
O
O
Cl
O
1-
10. What do we think “chlorite” will look
like? (Discuss - be ready to share).
Probably same charge, one less oxygen.
a) Draw a model of a chlorite ion.
b) Formula
10. What do we think “chlorite” will look
like? (Discuss - be ready to share).
Probably same charge, one less oxygen.
a) Draw a model of a chlorite ion.
b) Formula ClO2O
1Cl
O
Working independently - any order
1) Finish Polyatomic Ions Pogil
2) a) 8 Common polyatomic ions quiz and /or
b) Many polyatomic ions quiz - challenge
3) Work on Solid/liquid lab report due tonight before 11:30PM.
4) Read Chapter 3 or 13 and attempting online chapter tests
(Reading and Writing Assignment)
5)
Try out this Molecular Polarity Simulation