1. DO NOW

2. Write the formula for calcium nitride
It is ionic so write the charges and criss cross.
Is there a metal and/or a poly?
Ca+2 N-3
How do we know it is not a poly?
Ca3N2 2 2

3. Fe+3(SO4)-2 Write the formula for Iron(III) sulfate Fe2(SO4)3
It is ionic so write the charges and criss cross.
Is there a metal and/or a poly?
Fe+3(SO4)-2
Fe2(SO4)3 3 3

4. (NH4)+1 O-2 Write the formula for ammonium oxide (NH4)2O Is it ionic?
Is ammonium an element or a poly?
(NH4)+1 O-2
It is ionic so write the charges and criss cross.
(NH4)2O 4 4

5. Is there a metal and/or a poly? Is the metal a transition metal?
Write the name for…..
Is there a metal and/or a poly?
Na2S
Is the metal a transition metal?
Sodium sulfide 5 5

6. Is there a metal and/or a poly?
Write the name for…..
NH4 NO3
Is there a metal and/or a poly?
2 polyatomic ions
Ammonium nitrate 6 6

7. Write the name for….. (NH4)3 N Ammonium nitride 1 polyatomic ion
Is there a metal and/or a poly?
It is ionic so we don’t worry about naming subscripts
Ammonium nitride 7 7

8. Write the name for….. cobalt (II) hydroxide x -1
Is the metal a transition or post transition metal?
Is there a metal and/or a poly?
Co(OH)2 1
1x -2 = 0
x = 2
cobalt (II) hydroxide 8 8

9. Write the name for….. gold (III) carbonate x -2
Is the metal a transition or post transition metal?
Is there a metal and/or a poly?
Au2(CO3)3
2x -6 = 0
x = 3
gold (III) carbonate 9 9

10. Formula unit (many formula units in an ionic crystal.
Recap - Which one is covalent?
Covalent
molecule
Ionic crystal
Formula unit (many formula units in an ionic crystal. 10 10

11. When we write the formula for an ionic compound, do we care about the subscripts?
For instance, AlF3 is ionic. Name this compound.
Aluminum fluoride b)Aluminum trifluoride? 11 11

12. YES, remember the man who inhaled SF6 How was that named in the video?
When we name covalent compounds (molecular),
We do care about the subscripts?
YES, remember the man who inhaled SF6
How was that named in the video?
Sulfur hexafluoride 12 12

13. (Binary) Covalent compounds are made from 2 non-metals

14. N2O5 dinitrogen pentoxide
For Covalent Compounds, All subscripts are named with prefixes
N2O5 dinitrogen pentoxide 14 14

15. Rules for naming Covalent Compounds
Do NOT crisscross (only crisscross with ionic ) ex.dinitrogen tetroxide is N2O4 and NOT N4O2) (2nd element still ends in –ide)
Do NOT reduce subscripts (only reduce with ionic ) Ex. N2O4 does NOT reduce to NO2)
3. All subscripts are named with a prefix EXCEPT when the first element has a subscript of “1” , you may drop the first “mono” EX. CO2 is carbon dioxide (and not monocarbon dioxide)
4. Do NOT drop the second element’s “mono” (ex) NO is nitrogen monoxide

16. Is there a metal and/or a poly?
Write the formula for carbon tetrachloride
Is there a metal and/or a poly?
Only non-metals so it is covalent. The subscripts are “named” with prefixes
CCl4 16 16

17. disilicon hexabromide
Write the name for Si2Br6
disilicon hexabromide 17 17

18. Write the formula for boron triiodide
BI3 18 18

19. Tetraphosphorus pentasulfide
Write the name for P4S5
Tetraphosphorus pentasulfide 19 19

20. Is it dipotassium monosulfide?
Write the name for K2S
Is it dipotassium monosulfide?
NO, this is ionic so no prefixes! (No mono, di, tri….)
potassium sulfide 20 20

21. Work in your groups #1-7 on the worksheet.

22. chromium (III) sulfate
Write the name for….. x -2
Is the metal a transition or post transition metal?
Is there a metal and/or a poly?
Cr2(SO4)3
2x -6 = 0
x = 3
chromium (III) sulfate 22 22

23. Fe+2(OH)-1 Write the formula for Iron(II) hydroxide Fe(OH)2
It is ionic so write the charges and criss cross.
Is there a metal and/or a poly?
Fe+2(OH)-1
Is hydroxide an element or a poly?
Fe(OH)2 23 23