Download Naming and writing formula for ionic compounds

Determine the Ionic Charge of the
following
1.
Sr
2. Te
3. N
4. Mg
5. Se
Compounds
•Compounds are a combination of
at least two elements that act as
one unit
•Compounds have separate
identities different from their
component elements
Compounds
•When a compound forms it causes a chemical
bond to occur.
•A chemical bond -is the force that holds two
atoms together
•This is the result when electrons are gained,
lost, or shared between atoms
Ionic Bonds
•Ionic bonds form between METALS &
NONMETALS only
•Example: NaCl, MgCl2
•Ionic bonds form ionic compounds which stay
together due to the electrostatic attraction
between the cat-ion and an-ion
•Ionic compounds are usually crystalline solids at
room temperature
Chemical Formulas
•Chemical Formulas show the kinds and number
of each atom present
•The small numbers written below a symbol are
called SUBSCRIPTS
•Subscripts show the number of each atom
present
•Metals are written first in the formula
Determine the kinds and number of
each atom in the following:
•1.
•2.
•3.
•4.
•5.
•6.
CO2
Al(NO3)3
CCl4
MgSO4
Mn(NO3)7
HCl
Charges for Groups 3-12
•Groups 3-12 are known collectively as the
transition metals
•These metals can take various charges
•For example:
•Cr can take a +2, +3, or +6 charge
•Fe can take a +2 or +3 charge
Charges for Groups 3-12
•Exceptions:
•(Three that you need to memorize)
•Silver is always +1
•Zinc is always +2
•Cadmium is always +2
Binary Ionic Compounds
•A binary ionic compound is an ionic compound
that contains only 2 elements
•Examples:
•NaCl
MgF2
•Binary ionic compounds use the ionic charges in
order to write correct formulas
Writing Correct Chemical Formulas for
Binary Ionics:
• 1. Determine the charge of each ion
•2. Crisscross the value associated with the
charge to the bottom right of the other atom
•3. Reduce the subscripts to the lowest
possible terms
Example: Write the formula for:
• Magnesium and Chlorine
2+
Mg
-1
Cl
MgCl2
Write Formulas for the following:
• 1. Mg, P
•2. Al, S
•3. Ag, Cl
•4. K, I
•5. Zn, P
•6. Na, O
•7. Al, F
Practice Writing Compounds
Write the symbols for the following
names
Ca, Cl
•2. Cd, O
•3. Na, F
•4. Ag, N
•5. Zn, S
•6. Ra, Br
• 1.
Practice Writing Compounds
•Mg, N
•Al, S
•Na, N
•Cd, F
•Ag, P
•Sr, Br
•Ga, At
•When Sodium and Sulfur react, what
compound is produced?
•When Calcium and Bromine react, what
compound is produced?
Naming Ions
•Cations take the metal’s name and add cation
+
•Example: Na = sodium cation
•Name the following:
+
•K
•Al3+
Naming Ions
•Anions always add “-ide” as a suffix in place of
the original ending
•Cl- = Chloride anion (Not Chlorine)
•O2- = Oxide anion (Not Oxygen)
•Name the following:
•S 2•N 3-
Naming Binary Ionic Compounds
•In naming binary ionic compounds, put the cation’s
name with the anion’s name
•Example: MgF2
•Mg+2 = Magnesium cation
•F = Fluoride anion
•Magnesium Fluoride
•Example: Na2S
•Na+= Sodium cation
•S-2= Sulfide anion
•Sodium Sulfide
Binary Ionic Compounds Containing Transition
Metals
•In naming compounds with transition metals,
include the roman numeral with the transition
metal
•To figure out the transition metal’s charge, look
at the anion’s charge
Binary Ionic Compounds Containing Transition Metals
•Example: FeCl3
•Cl has a -1 charge
•There are 3 Cl in the formula
•There is only one Fe in the formula
•So Fe must have a +3 charge to balance out the
Cl charge
•Iron (III) Chloride
Naming Transition Metals
•The transition metals can take various charges in
ionic compounds
•In order to name them, the charges must be
given
•The transition metals are located in groups 3-12
(the center of the periodic table)
Naming Transition Metals Using The
Roman Numeral System
•Cu2+ is called Copper (II)
•Cu+ is called Copper (I)
•Name the following ions:
•Fe2+ , Fe3+ , Sn2+ , Sn4+
Practice
Name the following compounds:
• 1. MgCl2
•2. Li2O
•3. BaS
•4. Sr3P2
•5. RbCl
•6. MgF2
•7. KCl
•8. Cs2S
•9. KBr
•Name or write the following compounds
•Chromium (VI) Oxide
•Ca3P2
•Strontium Sulfide
•Cu2O
Name or write the correct formula for the
following compounds
• 1.
Zinc Chloride
•2. Fe3P2
•3. Sodium Selenide
•4. CrN3
•5. Gold (II) Iodide
Name the following compounds
•1. CuO
•2. Co3N2
•3. Fe2O3
•4. CrI6
Write the formula for the following
names
•Write formulas for:
•1. barium oxide
•2. cobalt (II) fluoride
•3. silver phosphide
•4. zinc chloride
•5. Titanium (IV) oxide
Naming Ternary Compounds
•Ternary compounds are named similar to binary
ionic compounds:
•Still going to be using the cation’s name but this
time you are going to be using the polyatomic
name as the anion’s name
Ternary Compounds
• Ternary Compounds contain at least 3
different elements
• A ternary compound contains a
polyatomic ion
• Always write the polyatomic ion in
parenthesis before crossing the charges