Writing Formulas for Binary Ionic Compounds. The first thing we need is a couple of definitions:

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Presentation transcript:

Writing Formulas for Binary Ionic Compounds

The first thing we need is a couple of definitions:

1.When a metal combines with a nonmetal, an ionic compound is formed.

The first thing we need is a couple of definitions: 1.When a metal combines with a nonmetal, an ionic compound is formed. 2.A binary compound consists of only two elements.

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: METALSNON-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.

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 formula smallest whole number ratio 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 formula The formula for sodium chloride is Na 1 Cl 1 = NaCl

For every Na + ion, there is one Cl – ion Na + ion Cl – ion The formula for sodium chloride is Na 1 Cl 1 = NaCl

The formula for calcium fluoride is CaF 2 This means that calcium fluoride consists of a huge pile of Ca 2+ and F – ions. CaF 2

The formula for calcium fluoride is CaF 2 This means that calcium fluoride consists of a huge pile of Ca 2+ and F – ions. CaF 2

The formula for calcium fluoride is CaF 2 This means that calcium fluoride consists of a huge pile of Ca 2+ and F – ions. CaF 2 For every Ca 2+ 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:

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 – charges 2.Crossing down 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 Namealuminumbromide Ions Al 3+ Br 1– Total Charges Formula

Finding a formula by equalizing + and – charges What is the formula for aluminum bromide? Ion Namealuminumbromide Ions Al 3+ Br 1– 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 Namealuminumbromide Ions Al 3+ Br 1– Total Charges Formula

Finding a formula by equalizing + and – charges What is the formula for aluminum bromide? Ion Namealuminumbromide Ions Al 3+ Br 1– Total Charges +3–1 Formula

Finding a formula by equalizing + and – charges What is the formula for aluminum bromide? Ion Namealuminumbromide Ions Al 3+ Br 1– Total Charges +3 Formula

Finding a formula by equalizing + and – charges What is the formula for aluminum bromide? Ion Namealuminumbromide Ions Al 3+ Br 1– Total Charges +3–3 Formula

Finding a formula by equalizing + and – charges What is the formula for aluminum bromide? Ion Namealuminumbromide Ions Al 3+ Br 1– Total Charges +3–3 Formula Add up to 0

Finding a formula by equalizing + and – charges What is the formula for aluminum bromide? Ion Namealuminumbromide Ions Al 3+ Br 1– Total Charges +3–3 Formula AlBr 3

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +2–3 Formula Ca 3 P 2

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +2–3 Formula Ca 3 P 2

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 Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +2–3 Formula Ca 3 P 2

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +2–3 Formula Ca 3 P 2

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +6–6 Formula Ca 3 P 2

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +6–6 Formula Ca 3 P 2

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +6–6 Formula Ca 3 P 2

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +6–6 Formula Ca 3 P 2 Add up to 0

Finding a formula by equalizing + and – charges What is the formula for calcium phosphide? Ion Namecalciumphosphide Ions Ca 2+ P 3– Total Charges +6–6 Formula Ca 3 P 2

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? Rb 1+ S 2– Rb 2 S

Finding a formula by crossing down charges What is the formula for rubidium sulphide? Rb 1+ S 2– Rb 2 S

Finding a formula by crossing down charges What is the formula for rubidium sulphide? Rb 1+ S 2– Rb 2 S

Finding a formula by crossing down charges What is the formula for rubidium sulphide? Rb 1+ S 2– Rb 2 S

Finding a formula by crossing down charges What is the formula for rubidium sulphide? Rb 1+ S 2– Rb 2 S

Finding a formula by crossing down charges What is the formula for rubidium sulphide? Rb 1+ S 2– Rb 2 S 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? V 4+ O 2– V2O4V2O4

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4 Both of these numbers are multiples of 2

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4 Divide both of these numbers by 2

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4 VO2VO2 ÷2

Finding a formula by crossing down charges What is the formula for vanadium(IV) oxide? V 4+ O 2– V2O4V2O4 VO2VO2 Formula