6.1 CHEMICAL EQUATIONS Supplemental Practice Problem

PROBLEMS

1. Write the number of formula units represented by the following.

a. 5NaCl

b. H2O

c. 6MgCl2

d. ZnSO4

e. 2CuSO4

f. 12Pb(NO3)2

2. Determine the number of atoms of each element in the following.

a. 7H2O

b. 2(NH4)3PO4

c. 4Al2O3

d. 3CuSO4

Balance each of the following chemical reactions.

3. Mg(s) + O2(g) à MgO(s)

4. Fe(s) + O2(g) à Fe2O3(s)

5. H2O(l) + N2O3(g) à HNO2(aq)

6. Na2O(s) + H2O(l) à NaOH(aq)

7. Fe(s) + H2O(l) à Fe3O4(s) + H2(g)

Write balanced equations for the following chemical reactions.

8. magnesium bromide(aq) + chlorine(g) à magnesium chloride(aq) + bromine(g)

9. chlorine(g) + sodium iodide(s)à sodium chloride(s) + iodine(g)

10. potassium nitrate(s) à potassium nitrite(s) + oxygen(g)

11. zinc(s) + hydrochloric acid(aq) à zinc chloride(aq) + hydrogen(g)

12. calcium oxide(s) + hydrochloric acid(aq) à calcium chloride(aq) + water(l)

SECTION REVIEW

1. Write the number of formula units expressed by each of the following.

a. 5H2O

b. 9O2

c. 3(NH4)2SO4

d. 6NF3

e. C12H22O11

f. 4Fe2O3

Balance the following reactions.

2. HgO(s) à Hg(l) + O2(g)

3. H2O(l) à H2(g) + O2(g)

4. Al(s) + Pb(NO3)2(aq) à Al(NO3)3(aq) + Pb(s)

5. Cu(s) + AgNO3(aq) à Cu(NO3)2(aq) + Ag(s)

6. K(s) + H2O(l) à KOH(aq) + H2(g)

7. MnO2(s) + HCl(aq) à MnCl2(aq) + Cl2(g) + H2O(l)

8. Cl2(g) + LiI(aq) à LiCl(aq) + I2(g)

9. F2(g) + H2O(l) à HF(aq) + O3(g)

10. AgNO3(aq) + K2SO4(aq) à Ag2SO4(aq) + KNO3(aq)

11. NH3(g) + O2(g) à N2O4(g) + H2O(g)