Balancing Reactions Worksheet

A) Balance the following equations. 1.

__H2 + __O2 → __H2O

2.

__S8 + __O2 → __SO3

3.

__HgO → __Hg + __O2

4.

__Zn + __HCl → __ZnCl2 + __H2

5.

__Na + __H2O → __NaOH + __H2

6.

__C10H16 + __Cl2 → __C + __HCl

7.

__Si2H3 + __O2 → __SiO2 + __H2O

8.

__Fe + __O2 → __Fe2O3

9.

__C7H6O2 + __O2 → __CO2 + __H2O

10. __FeS2 + __O2 → __Fe2O3 + __SO2 11. __Fe2O3 + __H2 → __Fe + __H2O 12. __C7H16 + __O2 → __CO2 + __H2O

B) Write word statements for the following chemical equations. 1) NaCl + ZnO →⇐ ZnCl2 + Na2O 2)

Mg

+

O2

→⇐

MgO

C) Use your periodic table and the table of common ions to write chemical equations for the following reaction statements.

1) Calcium plus water produces calcium hydroxide and hydrogen gas.

2) Sodium chloride breaks down to give sodium and chlorine gas(Cl2).

3) Chlorine gas(Cl2) added to calcium bromide produces bromine and calcium chloride.

D) Work out what is wrong with the following formulae and fix them. Na2Cl CaCl NaOH2 ZnS2O4 KF3 NaSO4 AlO CuNO3 Mg2(NO) Mg2O MgCl3 K3O E) The following chemical equations are not balanced correctly. Fix and re-write them. 1) HCl

+

2) 3MgCl2 +

3NaOH 4CuCO3

⇐

NaCl

+

⇐ 2CuCl2

2H2O + 5Mg