Download Applied Notes: Unit 5A—Writing and Naming

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Name:___________________________________________ Period_________ Date_________________
Applied Notes: Unit 5A—Writing and Naming Chemical Forumulas
Read each note slide to find the answers to the questions. The questions go in the order of the slides.
1. When atoms are combined and bonded, what number do we use to determine the ratio or
number of atoms of each that we need to write the correct formula?
2. Fill in the following table with the correct information:
Chemical
Formula
Elements in Compound
(write full names)
Ratio
Type of Bond:
Covalent, Ionic,
Metallic
CO2
NaCl
H20
CaCl2
H2SO4
CH4
Rb2S
3. What are the four steps to writing a chemical formula?
4. Show how magnesium and chlorine are written into a chemical formula. Show the superscripts
(the numbers that go above the line) and the subscript (the numbers that go below the line) and
show the arrows of how they criss-cross, just like in the notes.
5. True or False…we write 1 as a subscript? Why or why not?
6. What do we write if two subscripts are equal? For instance, what if they are both “3” like this:
Na3Cl3
7. What do you do if one subscript is a “2” and the other a “4” such as this:
H4 O 2
8. Practice the “criss-cross” formula writing steps on the examples below, show the superscripts,
subscripts and the arrows just like in your example in the notes:
MgO
FeO
NaO
KCl
SnS
MgN
9. The word “poly” means “many”. What does polyatomic mean?
10. Use chart in notes to write the charge and the formula for the following polyatomic compounds:
Ammonium________________
Chlorate________________
Nitrate________________
11. Use the chart and the “criss-cross” formula method to determine the formulas of compounds
with polyatomic ions. Show the superscripts, subscripts and the arrows just like in your example
in the notes. Use parentheses when you have multiple polyatomic ions ex. (PO4)2
MgPO4
LiSO4
12. Using the chart in the notes, write the names of the compounds above:
FeNO4