Formulas, Names & Properties of Covalent Compounds
Name _________________________ Period __
IONIC compounds are made of a METAL and a NONMETAL, or sometimes a polyatomic ion is present
somewhere. COVALENT compounds are made of 2 NONMETALS. (NO METALS, NO polyatomic ions!)
Directions: Identify the following as Ionic (I) or Covalent (C)
1. Be(NO2)2
6. NO2
11. Al2S3
16. BrF
2. NF3
7. CBr4
12. PI3
17. NH4I
3. Cs2(CO3)
8. Mn3N2
13. CI4
18. IF7
4. CO2
9. OCl2
14. Rb3(PO3)
19. Ca(ClO2)2
5. CO
10. SF3
15. N2O4
20. SO2
Complete this chart:
Number
prefix
1
2
3
4
5
di-
6
7
8
9
10
Heptaor hecta-
Writing Formulas of Covalent Compounds
The prefix tells how many of each atom are present in the formula. “Mono-“ is NEVER used on the
first name, but is used when one atom is needed for the second element.
Directions: Write the proper formulas for these compounds (hydride is hydrogen sharing e- here):
1. antimony tribromide
2. hexaboron monosilicide
3. sulfur dichloride
4. carbon tetrahydride
5. selenium diiodide
6. diphosphorus trisulfide
7. iodine pentafluoride
8. nitrogen trifluoride
9. disilicon hexabromide
10. tricarbon octahydride
11. hexacarbon decahydride
12. dinitrogen tetroxide
13. pentaiodine monobromide
14. heptabromine monochloride
15. oxygen hexafluoride
Naming Covalent Compounds / prefix naming system
Use the prefixes ONLY on covalent compounds. See the examples!
FIRST NAME = write the prefix (except mono- is not used on the 1st name ) and the name of the
element SECOND NAME = always gets a prefix (mono IS used when 1 atom is there) and change
the ending to “-ide”.
Ex 1. SN2
Sulfur dinitride
Ex 3. C7I4 Heptacarbon tetraiodide
Ex 2. CSi carbon monosilicide
Ex 4. I2O
17. NO
27. I2O7
18. N2O5
28. I2O5
19. N2O
29. AtCl5
20. NO2
30. I5Cl
21. P2O5
31. I7Cl
22. P2O3
32. SbCl5
23. Cl2O7
33. AsBr3
24. Cl2O5
34. Ge3N4
25. SeS
35. P3N5
26. SeS2
36. TeF6
diiodine monoxide
Use your notes here!
Classify the following properties as belonging to Ionic compounds or Covalent compounds
1. HIGH melting point
4. Low boiling point
7. Has a crystalline
10. is an electrolyte
(crystal ) shape
2. conducts electricity
5. conducts electricity
8. Low melting point
11. is a nonelectrolyte
when dissolved
when melted
3. does not dissolve well 6. does not conduct
9. dissolves well
12. High boiling point
electricity