Honors Chemistry 

Balancing equations (Form A)

Mr. McAfoos 

Section I. In the space provided tell what type of reaction each of the following is. Then balance each of the following equations. All formulas are written correctly. Assume all reactions occur as written.

1. ____DD____________

3 BaCl2 + 2 Na3PO4 ---> Ba3(PO4)2 + 6 NaCl

2.____SD______________

3 Fe + 2 AlCl3 ---> 3 FeCl2 + 2 Al

3._____SD______________

2 AgNO3 + Cu ---> Cu(NO3)2 + 2 Ag

4.______Comb____________

2 NaH + O2 ---> Na2O + H2O

5.______Comb____________

CH4 + 2 O2 ---> CO2 + 2 H2O

6.______Decomp__________

2 H2O2 ----> 2 H2O + O2

7._____Syn______________

Fe + S ---> FeS

Section II. Complete and balance each of the following reactions. Assume all reactions will occur as written.

1. 3 Sr(NO3)2 + Fe2(SO4)3 ---> 3 SrSO₄ + 2 Fe(NO₃)₃

2. 3 Mg + Fe2(SO4)3 ---> 3 MgSO4 + 2 Fe

3. 2 C2H6 + 7 O2 ---> 4 CO₂ + 6 H₂O

4. CoS ----> Co + S

Section III. Write, complete and balance the following reactions. Assume all reaction will occur as written.

1. Hydrochloric acid reacts with iron. (Iron forms a +3 ion in the reaction)

6 HCl + 2 Fe à 2 FeCl₃ + 3 H₂

2. silver I nitrate reacts with sodium sulfide

AgNO₃ +  Na₂S à 2 NaNO₃ + Ag₂S

3. tetracarbon octahydide burns

C₄H₈ + 6 O₂ à 4 CO₂ + 4 H₂O

4. potassium carbonate decomposes

K₂CO₃ à K₂O + CO₂

Section IV. Determine whether or not the following reactions occur. If they do, complete and balance them. If they do not occur write N.R. (no reaction)

1. Fe(C2H3O2)3 + Na3PO4 ---> FePO₄ + 3 NaC₂H₃O₂

2. BaCl2 + Fe(NO3)3 ---> N.R.

3. H2SO4 + Na₂CrO4 ---> N.R.

4. 2 Na + CuCl2 ---> 2 NaCl + Cu

5. Mg + K2SO4 ---> N.R.

6. 2 K + 2. H2O ---> 2 KOH + H₂