Chapter 9.5
The Laws Governing Formulas and Names
BY: Alex Badawi
Due: 5/18/13
Chemistry!
Key Terms

These key terms are in the first 2 pages of the
lesson, and I was advised not to use any
information on the these 2 pages. So basically
there are no key terms for this lesson.
Key Concepts
1. How should you use a flowchart to name a
chemical compound?
1. Follow the arrows and answer the questions
on the flowchart to write the correct name for a
compound.
Key Concepts (continue)
2. What are the four guidelines for writing the formulas of
chemical compounds?
2.
1. An -ide ending generally indicates a binary compound.
2. An -ite or -ate ending means a polyatomic ion that
includes oxygen is in the formula.
3. Prefixes in a name generally indicate that the compound
is molecular.
4. A Roman numeral after the name of a cation shows the
ionic charge of the cation.
Practicing Skills
Naming Chemical Compounds



In this Chapter you learned two basic skills that could help you to
deal with an emergency involving chemicals: writing chemical
formulas and naming chemical compounds.
You may find it difficult to know when you should or should not use
prefixes and Roman numerals in a name, or you may have trouble
determining if a compound's name should end in -ate, -ide, or -ite.
The next slide will show you ways to write chemical products.
Practicing Skills
Writing Chemical Formulas


The second key concept explained the ways to write chemical
formulas.
Here is an example: Writing the formula for sodium chromate,
there is no prefix to it, so it has to be ionic. The ions are
sodium ion and chromate ion.
Examples

Calcium Chloride
NaCO3

CaCl2
Sodium Carbonate
-Element
-Element
Calcium= Ca
Na= Sodium
Chlorine= Cl
C= Carbon
O= Oxygen
-Ions
CO3= Carbonate
Ca= +2 cations
Cl= -1 anions
-Ions
Na= +1 cation
CO3= -2 anions
Practice Problems
1. Name Ca(ClO3)2 in word form.
2. Name KCrO4 in word form.
3. Name CaF in word form.
4. Name Iron(II) Sulfate in formula form.
5. Name SnCr2O7 in word form.
6. Identify the incorrect names or formulas.
a. calcium(II) oxide
c. Na2C2O4
b. aluminum oxide
d. Mg(NH4)2
7. Write formulas for these compounds.
a. tin(II) hydroxide
b. barium fluoride
Practice Problems(continued)
8. Write MgSO4 in word form.
9. Write Calcium Selenide in a formula form.
10. Write P2O5 in word form.
END OF SHOW!!!