Unit 6: Naming Ionic and Covalent Compounds, % composition, empirical and molecular
formulas
1. What is the correct name for ClO2?
a. Chlorine dioxide
b. Monochlorine dioxide
c. Dichlorine monoxide
d. Chlorine oxide
2. What is the name of SiCl4?
a. Silicon chloride
b. Monosilicon tetrachloride
c. Silicon tetroxide
d. Silicon tetrachloride
3. What is the correct formula for nitrogen monoxide?
a. NO2
b. No
c. NO
d. N2O
4. What is the correct formula for the compound tetraphosphorus trisulfide?
a. P3S4
b. P5S4
c. 4PS2
d. P4S3
5. What is the correct name of CO?
a. Monocarbon monoxide
b. Carbon dioxide
c. Carbon dioxide
d. Carbon oxide
6. What is the correct formula for boron trifluoride?
a. B3F
b. BF3
c. 3BF
d. B3F3
7. What is the correct formula for carbon tetrabromide?
a. CB4
b. C4Br
c. C4Br
d. CBr4
8. What is the correct formula for dinitrogen monoxide?
a. N2O2
b. N2O
c. NO2
d. 2NO
9. The correct name for the compound Fe2S3 is
a. Diiron trisulfide
b. Iron (III) sulfide
c. Iron sulfide
d. Iron (II) sulfide
10. The correct formula for chromium (III) oxide is
Unit 6: Naming Ionic and Covalent Compounds, % composition, empirical and molecular
formulas
a. Cr3O3
b. Cr3O2
c. Cr2O2
d. Cr2O3
11. The correct name for the compound Cu3N is
a. Copper (II) nitrate
b. Copper (III) nitride
c. Copper nitrogen
d. Copper (I) nitride
12. The correct formula when calcium and nitrogen bond together would be
a. Ca2N3
b. Ca3NO3
c. Ca3(NO3)2
d. Ca3N2
13. The correct formula when nickel (II) and bromine combine would be
a. NiBr
b. Ni2Br
c. NiBr2
d. NiB2
14. The formula that would be made when aluminum and the phosphate ion bond
would be
a. AlPO4
b. Al3(PO4)3
c. Al3(PO4)
d. Al(PO4)3
15. If an element in group 1 was to combine with an element in group 7 (17), the
resulting compound would have a ratio of:
a. 1 : 1
b. 1 : 2
c. 2 : 1
d. 3 : 3
16. If an element in group 2 was to combine with an element in group 5 (15), the
resulting compound would have a ratio of:
a. 2 : 3
b. 3 : 2
c. 2 : 5
d. 5 : 2
17. If a molecular formula for some compound is X2Y6, a possible empirical formula
could be
a. XY2
b. X2Y3
c. XY3
d. X3Y
18. What is a possible molecular formula for a compound with the empirical formula
of CH3?
a. C2H3
Unit 6: Naming Ionic and Covalent Compounds, % composition, empirical and molecular
formulas
b. C3H6
c. C3H
d. C3H9
19. Analysis shows that some compound has the following percent composition:
40.05% S and 59/95 % O. What is its empirical formula?
a. S3O
b. SO3
c. SO
d. S3O6
20. Propane is a hydrocarbon. it is 81.82 % carbon and 18.18 % hydrogen. What is
the empirical formula?
a. CH8
b. C8H3
c. CH3
d. C3H8
21. Analysis shows that some compound has the following percent composition:
48.64% C, 8.16 % H, and 43.20 % O. What is its empirical formula?
a. C1.5H3O
b. C2H3O
c. CHO
d. C3H6O2
22. The hydrocarbon used in manufacture of foam plastics is called styrene. Analysis
of styrene indicates the compound is 92.25 % C and 7.75 % H and has a molar
mass of 104 g/mol. What is the molecular formula for styrene?
a. C8H
b. CH
c. C8H8
d. CH4
23. A colorless liquid composed of 46.68 % N and 53.32 % O has a molecular mass
of 60.01 g/mol. What is the molecular formula?
a. NO
b. N2O
c. N2O2
d. N4O2
24. The empirical formula of a compound is C3H3O. The molecular mass is 110.0
g/mol. What is its molecular formula?
a. C3H3O
b. CHO3
c. C6H6O
d. C6H6O2
25. The empirical formula of a compound is PNCl2. The molecular mass is 695
g/mol. What is its molecular formula?
Unit 6: Naming Ionic and Covalent Compounds, % composition, empirical and molecular
formulas
26. Calculate the % composition of sodium sulfate.
27. What is the percent composition of H3PO4?
28. Determine the % by mass (% composition) of sucrose, C12H22O11.
a. 42.10 % C, 6.480 % O, 51.42 % H
b. 58.23 % C, 7.65 % O, 34.12 % H
c. 44.0 % C, 6.75 % H, 53.98 % O
d. 42.10 % C, 6.480 % H, 51.42 % O