Writing Formulas for Binary Ionic Compounds. The first thing we need is a couple of definitions:
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Transcript of Writing Formulas for Binary Ionic Compounds. The first thing we need is a couple of definitions:
Writing Formulas for Binary Ionic
Compounds
The first thing we need is a couple of definitions:
The first thing we need is a couple of definitions:1. When a metal combines with a non-
metal, an ionic compound is formed.
The first thing we need is a couple of definitions:1. When a metal combines with a non-
metal, an ionic compound is formed.2. A binary compound consists of only
two elements.
In Science 10, you’ll be given this Periodic Table:
In Science 10, you’ll be given this Periodic Table:
In Science 10, you’ll be given this Periodic Table:
See the staircase!
In Science 10, you’ll be given this Periodic Table:
METALS
In Science 10, you’ll be given this Periodic Table:
METALS NON-METALS
A binary ionic compound forms when:
A binary ionic compound forms when: a positively charged metal ion combines with
A binary ionic compound forms when: a positively charged metal ion combines with a negatively charged non-metal ion.
What the formula for an ionic
compound means.
The formula for the ionic compound sodium chloride is NaCl.
The formula for the ionic compound sodium chloride is NaCl.This does NOT mean that sodium chloride consists of individual NaCl “molecules” like this:
The formula for the ionic compound sodium chloride is NaCl.This does NOT mean that sodium chloride consists of individual NaCl “molecules” like this:
Na Cl
The formula for the ionic compound sodium chloride is NaCl.This does NOT mean that sodium chloride consists of individual NaCl “molecules” like this:
Na Cl
Na+ ion
Cl– ion
Na+ ion
Cl– ion
Crystal lattice of NaCl
For every Na+ ion, there is one Cl–
ion
Na+ ion
Cl– ion
Na+ ion
Cl– ion
The formula for an ionic compound gives the smallest whole number ratio of ions.
For every Na+ ion, there is one Cl–
ion
Na+ ion
Cl– ion
The formula for sodium chloride is
Na1Cl1= NaCl
For every Na+ ion, there is one Cl–
ion
Na+ ion
Cl– ion
The formula for sodium chloride is
Na1Cl1= NaCl
The formula for calcium fluoride is CaF2
This means that calcium fluoride consists of a huge pile of Ca2+ and F–
ions.
CaF2
The formula for calcium fluoride is CaF2
This means that calcium fluoride consists of a huge pile of Ca2+ and F–
ions.
CaF2
The formula for calcium fluoride is CaF2
This means that calcium fluoride consists of a huge pile of Ca2+ and F–
ions.
CaF2For every Ca2+ ion, there are 2 F– ions
Finding the formula for an
ionic compound
There are two methods that we will show you for finding formulas.
There are two methods that we will show you for finding formulas. Then you can decide which method works best for you.
There are two methods that we will show you for finding formulas. Then you can decide which method works best for you. The two methods are:
There are two methods that we will show you for finding formulas. Then you can decide which method works best for you. The two methods are:1. Equalizing + and – charges
There are two methods that we will show you for finding formulas. Then you can decide which method works best for you. The two methods are:1. Equalizing + and – charges2. Crossing down charges
Finding a formula by equalizing + and – charges
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges
Formula
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges
Formula
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges
Formula
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges +3 –1
Formula
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges +3
Formula
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges +3 –3
Formula
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges +3 –3
Formula
Add up to 0
Finding a formula by equalizing + and – charges
What is the formula for aluminum bromide?
Ion Name aluminum bromide
Ions Al3+ Br1–
Br1–
Br1–
Total Charges +3 –3
Formula AlBr3
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +2 –3
Formula Ca3P2
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +2 –3
Formula Ca3P2
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +2 –3
Formula Ca3P2
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +2 –3
Formula Ca3P2
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +6 –6
Formula Ca3P2
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +6 –6
Formula Ca3P2
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +6 –6
Formula Ca3P2
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +6 –6
Formula Ca3P2
Add up to 0
Finding a formula by equalizing + and – charges
What is the formula for calcium phosphide?
Ion Name calcium phosphide
Ions Ca2+
Ca2+
Ca2+
P3–
P3–
Total Charges +6 –6
Formula Ca3P2
Finding a formula by crossing down charges
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Rb1+ S2–
Rb2S
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Rb1+ S2–
Rb2S
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Rb1+ S2–
Rb2S
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Rb1+ S2–
Rb2S
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Rb1+ S2–
Rb2S
Finding a formula by crossing down charges
What is the formula for rubidium sulphide?
Rb1+ S2–
Rb2S Formula
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
Mulitvalent
metal
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
Mulitvalent
metal
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide? Tells us what the
ion charge is
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4Both of these numbers are multiples of 2
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4Divide both
of these numbers by 2
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
VO2
÷2
Finding a formula by crossing down charges
What is the formula for vanadium(IV) oxide?
V4+ O2–
V2O4
VO2Formula