Naming Ionic Compounds and Formulas

Ionic Compounds

Chemical Name: The chemical name tells you what ions (charged atoms) are in the compoundeg. Sodium chloride:

has sodium and chlorine in it Calcium oxide:

Ionic Compounds

Chemical Name: The chemical name tells you what ions (charged atoms) are in the compoundeg. Sodium chloride:

has sodium and chlorine in it Calcium oxide: has calcium and oxygen in it

How do we write chemical names?

• Rules for naming compounds1) Start the name with the positive ion (metal)

How do we write chemical names?

• Rules for naming compounds1) Start the name with the positive ion (metal)2) The second ion is the negative ion (non-metal)

How do we write chemical names?

• Rules for naming compounds1) Start the name with the positive ion (metal)2) The second ion is the negative ion (non-metal)3) The name of the metal stays the same

How do we write chemical names?

• Rules for naming compounds1) Start the name with the positive ion (metal)2) The second ion is the negative ion (non-metal)3) The name of the metal stays the same4) The name of the non-metal had a new ending

(the “ide” ending)

What would be the name of the following compounds

Chlorine and Magnesium:________________________

Nitrogen and Iron:______________________________

Calcium and Bromide:___________________________

Silver and Fluorine:_____________________________

What would be the name of the following compounds

Chlorine and Magnesium: Magnesium chloride

Nitrogen and Iron: Iron nitride

Calcium and Bromide: Calcium bromide

Silver and Fluorine: Silver fluoride

Write the names of the following compounds

1) AlI3 _____________________________________________

2) Na2O ____________________________3) Mg3P2 _____________________________________________

4) AgI ____________________________5) K2S ____________________________6) RbF ____________________________7) Ag3N ____________________________8) CaI2 ____________________________________________

Write the names of the following compounds

1) AlI3 Aluminum iodide2) Na2O Sodium oxide3) Mg3P2 Magnesium phosphide4) AgI Silver iodide5) K2S 6) RbF 7) Ag3N 8) CaI2

Write the names of the following compounds

1) AlI3 Aluminum iodide2) Na2O Sodium oxide3) Mg3P2 Magnesium phosphide4) AgI Silver iodide5) K2S Potassium sulphide6) RbF Rubidium fluoride7) Ag3N Silver nitride8) CaI2 Calcium iodide

Ionic Compounds

Chemical Formula: The chemical formula tells you what ions (charged atoms) are in the compound and the relative number of the ions.

Ionic Compounds

Chemical Formula: The chemical formula tells you what ions (charged atoms) are in the compound and the relative number of the ions. eg. NaCl:

Ca2O:

Ionic Compounds

Chemical Formula: The chemical formula tells you what ions (charged atoms) are in the compound and the relative number of the ions. eg. NaCl:

has sodium and chlorine in it and it has 1 sodium ion to 1 chlorine ion

Ca2O: has calcium and oxygen in it and there is

2 calcium ions for every 1 oxygen ion

Writing Chemical Formulas

• Steps for writing a chemical formula1) Write down the ions with charges2) Determine how you are going to balance the

charges

Writing Chemical Formulas

• Steps for writing a chemical formula1) Write down the ions with charges2) Determine how you are going to balance the

charges3) Note the ratio of positive to negative ions4) Write the subscript into the formula

Examples: Zinc nitrideStep 1: write the ions with the charge Zn2+ N3-

Step 2: Balance the charge

Step 3: Note the ratio of + and -

Step 4: Write the subscripts in the formula

Examples: Zinc nitrideStep 1: write the ions with the charge Zn2+ N3-

Step 2: Balance the charge They must equal the same number with different signs2+ : 2+, 2+, 2+ = 6+ Balanced 3- : 3-, 3- = 6-

Step 3: Note the ratio of + and -

Step 4: Write the subscripts in the formula

Examples: Zinc nitrideStep 1: write the ions with the charge Zn2+ N3-

Step 2: Balance the charge They must equal the same number with different signs2+ : 2+, 2+, 2+ = 6+ Balanced 3- : 3-, 3- = 6-

Step 3: Note the ratio of + and - 3 Zn2+ ions for every2 N3- ions

Step 4: Write the subscripts in the formula Zn3N2

Example: Aluminum chlorideStep 1: write the ions with the charge Al3+ Cl1-

Step 2: Balance the charge They must equal the same number with different signs3+ : 3+ = 3+ Balanced 1- : 1-, 1-, 1- = 3-

Step 3: Note the ratio of + and -

Step 4: Write the subscripts in the formula

Example: Aluminum chlorideStep 1: write the ions with the charge Al3+ Cl1-

Step 2: Balance the charge They must equal the same number with different signs3+ : 3+ = 3+ Balanced 1- : 1-, 1-, 1- = 3-

Step 3: Note the ratio of + and - 1 Al3+ ion for every 3 Cl1- ions

Step 4: Write the subscripts in the formula AlCl3

Examples

Step 1: write the ions with the chargeStep 2: Balance the chargeStep 3: Note the ratio of + and -Step 4: Write the subscripts in the formula