Name: ___________________ Mr. Warren—NKEC

Science 10: Chemistry Section Worksheet on naming molecular and ionic compounds 1. Why are there roman numerals in the compound Manganese (II) oxide, but not in the compound Magnesium oxide?

2. Explain the difference between an ionic compound and a molecular compound.

3. Indicate whether each compound below is ionic or molecular. a. b. c. d. e. f. g.

KCl NaOH NO CO2 P2O3 HCl FeSO4

_______________ _______________ _______________ _______________ _______________ _______________ _______________

4. Circle and write the name of the polyatomic ion in each compound below: a. b. c. d. e. f. g.

NaClO4 HCN MgCrO4 Li2SO4 Ca3(PO4)2 KNO3 NH4Br

_______________ _______________ _______________ _______________ _______________ _______________ _______________

5. Explain why Ca3(PO4)2 has brackets around the polyatomic ion whereas MgCrO4 does not require brackets?

Name: ___________________ Mr. Warren—NKEC 6. Name the molecular compounds below: a. b. c. d. e.

P2O5 N3O2 S2Cl3 NBr4 S8F

_______________ _______________ _______________ _______________ _______________

7. When ∙H2O is attached to a compound, what is it referred to as?

8. Name the ionic compounds below: a. b. c. d. e.

KCl _______________ Al2O3 _______________ CrN _______________ NiBr3 _______________ Mg3(PO4)2∙8H2O _______________

9. Write formulas for the molecular compounds below: a. b. c. d. e.

triphosphorus monoxide _______________ silicon dioxide _______________ pentanitrogen tricarbide _______________ Sulfur tribromide _______________ Carbon tetraiodide _______________

10. Write formulas for the ionic compounds below: a. b. c. d. e.

Calcium phosphite _______________ Sodium sulfide _______________ Potassium nitride _______________ Titanium (III) phosphide _______________ Zinc (II) chloride hexahydrate _______________