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Naming Compounds. Naming Compounds.  As mentioned in an early lesson, there are two main types of compounds, ionic and molecular. Some of the compounds that you will learn about this year will require special systems for naming, and we will learn about them at a later time.  .

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naming compounds1
Naming Compounds

 As mentioned in an early lesson, there are two main types of compounds, ionic and molecular.

Some of the compounds that you will learn about this year will require special systems for naming, and we will learn about them at a later time. 

naming compounds2
Naming Compounds

I. Binary Compounds :

  • consist of only two elements. 
  • The formula for a binary compound will contain only two capital letters. 
slide4

When naming a binary compound, regardless of whether it is ionic or molecular, follow the following steps

naming compounds3
Naming Compounds
  • STEP 1.  Write the name of the element represented by the first symbol in the formula.
naming compounds4
Naming Compounds
  • STEP 2.  Write the name of the element represented by the second symbol in the formula, but change the ending of the element\'s name to "ide".
naming compounds5
Naming Compounds
  • STEP 3.  Check a reference table to determine the number of positive oxidation numbers that the first element forms.  If it only forms one then you are done.
naming compounds6
Naming Compounds
  • STEP 4.  If the first element shows more than one oxidation number, than use the stock system.  Determine the oxidation number that the first element is showing and write that roman numeral in-between the two elemental names.
naming compounds7
Naming Compounds
  • Example 1. 
  • What is the correct name for the compound AlBr3 ?
naming compounds8
Naming Compounds
  • Step 1.
  • aluminum
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Naming Compounds
  • Step 2. 
  • bromine becomes bromide.
naming compounds10
Naming Compounds
  • STEP 3
  •   Aluminum always has an oxidation number of +3, therefore ,our answer is;
  • aluminum bromide
naming compounds11
Naming Compounds
  • Example 2. 
  • What is the correct name for the

Element AgS ?

naming compounds12
Naming Compounds
  • STEP 1
  • Silver
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Naming Compounds
  • Step 2
  • In this case, sulfur becomes sulfide.
naming compounds14
Naming Compounds

Step 3

Silver forms oxidation numbers of +1, +2, so we must go to the next step.

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Naming Compounds
  • Step 4
  • We check the oxidation number of sulfide and find that it is -2.  If one silver is canceling out one sulfur than the apparent charge on the silver must be +2.  (+2) + (-2) = 0.
  • So the name is
  • Silver (II) Sulfide
slide18

Example 3. 

  • What is the correct name for the compound Fe2O3 ?
slide19

Step 1. Write the name of the element represented by the first symbol in the formula.

  • iron
  • Step 2.  Write the name of the element represented by the second symbol in the formula, but change the ending of the element\'s name to "ide".  So, oxygen becomes oxide.
  • iron oxide
  • Step 3.  Check a reference table to determine the number of positive oxidation numbers that the first element forms.  If it only forms one then you are done. Iron can be +2 or +3, so we must go on to step 4.
  • Step 4.  If the first element shows more than one oxidation number, than use the stock system.  Determine the oxidation number that the first element is showing and write that roman numeral in-between the two elemental names.  We know that oxygen is -2 in this case.   Since we have 3 atoms of oxygen, each with a charge of  -2, then the total negative charge is -6.  We must have +6 to balance out the -6.  Since there are two iron atoms to make up a total of +6, each must be +3.  2(+3) + 3(-2) = 0.
  • iron(III) oxide
ii ternary compounds compounds contain three elements
II. Ternary Compounds - compounds contain three elements. 
  • The only type of ternary compounds that we will learn how to name are those that consist of one polyatomic ion and one monatomic ion. 
slide21

The vast majority of these types of compounds consist of a positive monatomic ion and a negative polyatomic ion. 

slide22

Step 1. 

  • Write the name of the element represented by the first symbol in the compound.
slide23

Step 2. 

  • Write the name of the polyatomic ion, without changing the ending.
slide24

Step 3. 

  • Check a reference table to determine the number of positive oxidation numbers that the first element forms.  If it only forms one then you are done.
slide25

Step 4. 

  • If the first element shows more than one oxidation number, than use the stock system. 
  • Determine the oxidation number that the first element is showing and write that roman numeral in-between the two names.
slide26

Example 1. 

  • Can you name the compound Ca(CN)2 ?
slide27

Step 1

  • Calcium
slide28

Step 2. 

  • Calcium Cyanide
slide29

Step 3. 

  • Calcium can only be +2, so we must be done.
  • Calcium Cyanide
step 4
Step 4
  • iron(II) nitrate
slide32

http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson54.htmhttp://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson54.htm

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