1. Naming and Writing Chemical Compounds
Physical Science

2. DAY 12

3. Explain why you put subscripts in chemical formulas.
Activator
Explain why you put subscripts in chemical formulas.

6. Aqua Rules
American Rules
no Roman no Greek

7. Aqua Name
Write element names and change ending of second element to –ide.
Example: Na2O  Sodium oxide

8. Na2O Aqua Formulas Na1+ O2- Na1+ It take 2 Na1+ to balance 1 O2-
Balance positive and negative charges, then add subscripts
Example:
Na1+
Na2O
O2-
Na1+
It take 2 Na1+ to balance 1 O2-

9. Red Rules
Roman Rules
Roman numerals are the positive oxidation number for the transition metals (“the valley varies”)

10. Red Name
Write element names and change ending of second element to –ide.
Use the roman grid to find the red oxidation number and write as Roman Numeral.

11. Red Formulas Oxidation number for Iron (III) = 3+ O2- Fe3+
Get oxidation number for red element from Roman Numeral, balance charges, and write subscripts.
Example: Iron (III) oxide
Oxidation number for Iron (III) = 3+
O2-
Fe3+
It takes 2 Fe3+ and 3 O2- to balance positive and negative charges  Fe2O3
O2-
Fe3+
O2-

12. Green Rules
Greek Rules
Greek prefixes in name

13. Greek Prefixes One mono Two di Three tri Four tetra Five penta
Six hexa
Seven hepta
Eight octa
Nine nana
Ten deca

14. Green Name
Turn subscripts into Greek prefixes in front of element names (do not use mono- on the first element). Change ending of second element to –ide.
Example: CO2  Carbon dioxide
CO  Carbon monoxide

15. Green Formula
Turn Greek prefixes into formula subscripts. Do not try to balance charges.
Example: Carbon tetrachloride  CCl4

16. Ticket out the Door Name the following on a sheet of paper:
1. NaCl AlI3
3. NiO Ni2O3
NaF
Write the following equations:
1. Iron (II) chloride 2. Sodium chloride

17. Right or wrong?
If the formula is incorrect, write the correct formula:
LiF2
KBr
MgCl
AlO2

18. Ticket Out The Door Write formulas and name the following:
Na bonded with P
Ca bonded with N
Cs bonded with Se
Ba bonded with Br
Li bonded with I

19. Ticket Out the Door
Name the following: 1. NaCl 2. AlI3 3. NiO 4. Ni2O3 5. NaF