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19.2 Chemical Formulas
What is a chemical formula? What are oxidation numbers? Study them and find out what they are, and how they became!
15
Chemistry
9th Grade
11/14/2010

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Term
ions
Definition
an atom that has an electrical charge.
Term
ionic compound
Definition
A compound made out of ions.
Term
Oxidation number
Definition
Shows how many electrons are lost, Gained or Shared when bonding occurs.
Term
Monoatomic Ions
Definition
ions that only have ONE atom.
Term
Polyatomic ions
Definition
ions that contain more than one type of atom.
Term
RULES:part 1
Definition
1. Write the chemical and oxidation number of the positive ion. If the positive ion is monoatomic (only one atom), you can find its oxidation number from the periodic table. If the positive ion is polyatomic, use table 19.2 to find the oxidation number of the polyatomic ion.
Term
RULES: Part 2
Definition
2. Write the chemical formula and oxidation number for the negative ion. Again, USE THE PERIODIC TABLE IF THE NEGATIVE ION IS MONOATOMIC, or table 19.2 if the negative ion is polyatomic.
Term
Rule: Part 3
Definition
3. Add the oxidation numbers of the positive and negative ions. Do THEY add up to zero?
If yes, write the formula for the positive ion first and the negative ion second. Do not include the oxidation numbers in the chemical formula .BE SURE TO WRITE THE SUBSCRIPTS!!!!
Term
Rule: Part 4
Definition
4. If the oxidation numbers don’t add up to zero, figure out how many of each ion you will need so that the oxidation numbers add up to zero, Find out how many each ion you will need so that the oxidation numbers add up to zero. (HINT: find the least common multiple between the two oxidation numbers. The number that you have to multiply each oxidation number by to equal the least common multiple tells you how many of each ion you need!)
Term
Naming Ionic Compounds
Definition
1. Write out the name of the first element in the compound.
2. Write out the root name of the second element. For example, Chlor – is the root word for Chlorine. Simply subtract the -ine ending.
3. Add the ending –ide to the root name. Chlor- becomes chloride.
Term
Naming Ionic Compounds Cont.
Definition
To name a compound that contains polyatomic ions, follow these steps.
1. Write the name of the positive ion first. Use the periodic table or an ion chart to find its name.
2. Write the name of the negative ion second. Use the periodic table or an ion chart to find its name.
Term
Covalent compounds:
Definition
Compounds that are formed through covalent bonds (shared electrons).
Term
Binary Compounds:
Definition
Naming Covalent Compounds that consist of only two elements.
Term
Empirical Formula:
Definition
the simplest whole-number ratios by which elements combine.
Term
Molecular Formula:
Definition
The actual number of atoms of each element in the compound.
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