Science 10
Chemical Reactions
Investigation 10 – Balancing Chemical Equations
Balance the following equations by placing the correct coefficients on the lines provided.
1.
___ Fe + ___ S  ___ FeS
17. 2 Na + 2 H2O  2 NaOH + ___ H2
2.
___ Zn + ___ CuSO4  ___ ZnSO4 + ___ Cu
18. ___ Zn + ___ H2SO4  ___ ZnSO4 + ___ H2
3.
___ AgNO3 + ___ NaBr  ___ NaNO3 + ___ AgBr
19. ___ Mg(OH)2 +___ H2SO4  ___ MgSO4 + 2 H2O
4.
2 KClO3  2 KCl + 3 O2
20. ___ SO2 + ___ H2O  ___ H2SO3
5.
2 H2O  2 H2 + ___ O2
21. ___ Mg + 2 HNO3  ___ Mg(NO3)2 + ___ H2
6.
2 HgO  2 Hg + ___ O2
22. 2 Al + ___ Fe2O3  ___ Al2O3 + 2 Fe
7.
2 KI + ___ Pb(NO3)2  ___ PbI2 + 2 KNO3
23. 2 K3PO4 + 3 MgCl2  ___ Mg3(PO4)2 + 6 KCl
8.
4 Al + 3 O2  2 Al2O3
24. 4 NH3 + 3 O2  2 N2 + 6 H2O
9.
___ FeCl3 + 3 NH4OH  ___ Fe(OH)3 + 3 NH4Cl
25. ___ CaCO3  ___ CaO + ___ CO2
10. 2 Na2O2 + 2 H2O  4 NaOH + ___ O2
26. 2 NaCl + ___ H2SO4  ___ Na2SO4 + 2 HCl
11. ___ Fe2O3 + 3 C  2 Fe + 3 CO
27. 2 F2 + 4 NaOH  4 NaF + ___ O2 + 2 H2O
12. 2 Fe + 3 H2O  3 H2 + ___ Fe2O3
28. ___ Mg(NO3)2 + ___ CaI2  ___ Ca(NO3)2 + ___ MgI2
13. ___ FeCl3 + 3 KOH  3 KCl + ___ Fe(OH)3
29. 2 KF + ___ BaBr2  ___ BaF2 + 2 KBr
14. 2 Al + 3 H2SO4  ___ Al2(SO4)3 + 3 H2
30. 2 NaNO3 2 NaNO2 + ___ O2
15. ___ CO2 + ___ H2O  ___ H2CO3
31. ___ Pb(OH)2  ___ PbO + ___ H2O
16. 4 P + 5 O2  2 P2O5
32. 2 NH3 + ___ H2SO4  ___ (NH4)2SO4
Edited by Ms. Withrow
November 2010
33. ___ HCl + ___ NH3  ___ NH4Cl
42. ___ Cu2O + 2 HCl  2 CuCl + ___ H2O
34. ___ CuSO4 + ___ Fe  ___ FeSO4 + ___ Cu
43. 2 Fe + 3 O2  2 Fe2O3
35. 2 Al + 6 HCl  2 AlCl3 + 3 H2
44. ___ Si + 2 H2O  ___ SiO2 + 2 H2
36. 2 Pb(NO3)2  2 PbO + 4 NO2 + ___ O2
45. 2 Fe(OH)3  ___ Fe2O3 + 3 H2O
37. ___ CaO + ___ MgCl2  ___ MgO + ___ CaCl2
46. ___ CaO + ___ SO2  ___ CaSO3
38. ___ Ca + 2 H2O  ___ Ca(OH)2 + ___ H2
47. ___ CO2 + ___ Mg(OH)2  ___ MgCO3 + ___ H2O
39. 2 CrCl3 + 3 H2SO4  ___ Cr2(SO4)3 + 6 HCl
48. ___ CaO + 2 HCl  ___ CaCl2 + ___ H2O
40. ___ AlCl3 + ___ K3PO4  ___ AlPO4 + 3 KCl
49. ___ CaCO3 + ___ SiO2  ___ CaSiO3 + ___ CO2
41. ___ Al2O3 + 3 C + 3 Cl2  3 CO + 2 AlCl3
50. 2 Sb + 3 Cl2  2 SbCl3
Balance the following equations. Then write them out in words.
1. ___ MgCl2 + 2 NH4NO3  ___ Mg(NO3)2 + 2 NH4Cl
Magnesium chloride reacts with ammonium nitrate to produce magnesium nitrate and ammonium chloride
2. ___ Cu(NO3)2 + 2 NH4OH  ___ Cu(OH)2 + 2 NH4NO3
Copper (II) nitrate reacts with ammonium hydroxide to produce copper (II) hydroxide and ammonium nitrate
3. ___ Mg3N2 + 6 H2O  3 Mg(OH)2 + 2 NH3
Magnesium nitride reacts with water to produce magnesium hydroxide and nitrogen trioxide
4. ___ Al2(SO4)3 + 6 NH4Br  2 AlBr3 + 3 (NH4)2SO4
Aluminum sulphate reacts with ammonium bromide to produce aluminum bromide and ammonium sulfate
5. ___ Na2CO3 + 2 HCl  2 NaCl + ___ H2O + ___ CO2
sodium carbonate reacts with hydrogen chloride to produce sodium chloride and water and carbon dioxide
Edited by Ms. Withrow
November 2010