Types of Reactions (Predicting)

Compostion/Synthesis/Direct Combination

1. 2 Na + Cl2 2 NaCl

2. 3 Mg + N2  Mg3N2

3. Ni + S  NiS (or 8 Ni + S8 8 NiS)

4. C + O2 CO2 (or 2 C + O2 2 CO)

5. Br2 + Zn  ZnBr2

6. CO2 + H2O  H2CO3

7. I2 + Ba  BaI2

8. 2 Cr + 3 F2 2 CrF3 (or Cr + F2 CrF2 or Cr + 3 F2 CrF6)

9. 4 Li + O2 2 Li2O

10. S + Ca  CaS (or S8 + 8 Ca  8 CaS)

Decomposition

a. binary compounds

11. 2 HgO  2 Hg + O2

12. Ag2S  2 Ag + S (or 8 Ag2S  16 Ag + S8)

13. 2 H2O  2 H2 + O2

b. carbonates

14. ZnCO3 ZnO + CO2

15. Na2CO3 Na2O + CO2

16. CuCO3 CuO + CO2

17. Ag2CO3 Ag2O + CO2

c. chlorates

18. 2 KClO3  2 KCl + 3 O2

19. 2 NaClO3  2 NaCl + 3 O2

20. Mg(ClO3)2  2 MgCl2 + 3 O2

d. hydroxides

21. Zn(OH)2 ZnO + H2O

22. 2 NaOH  Na2O + H2O

23. 2 AgOH  Ag2O + H2O

24. Fe(OH)2  FeO + H2O

Single Replacement

25. 2 Na + 2 H2O  2 NaOH + H2

26. 2 Al + 3 ZnCl2 2 AlCl3 + 3 Zn

27. I2 + KCl  No Rxn.

28. HgO + 2 Ag  Ag2O + Hg

29. MgF2 + Cl2 No Rxn.

30. Br2 + 2 NaI  I2 + 2 NaBr

31. Ca + Pb(NO3)2 Ca(NO3)2 + Pb

32. SnCl2 + Zn  ZnCl2 + Sn

33. Al(NO3)3 + Sn  No Rxn.

34. Mg + 2 HCl  MgCl2 + H2

Double Replacement

35. AgNO3 + NaCl  NaNO3 + AgCl

36. LiOH + HBr  LiBr + H2O

37. Pb(NO3)2 + 2 KI  PbI2 + 2 KNO3

38. Fe(ClO3)3 + (NH4)2SO3 Fe2(SO3)3 + NH4ClO3

39.Cr(C2H3O2)3 + K3PO4 3 KC2H3O2 + CrPO4

40. HNO3 + NaOCl  NaNO3 + HOCl

41. BaBr2 + FeSO4 BaSO4 + FeBr2

42. Hg2(NO3)2 + MgCl2 Mg(NO3)2 + 2 HgCl

Combustion

43. 2 C4H10 + 13 O2 8 CO2 + 10 H2O

44. 2 CH3OH + 3 O2 2 CO2 + 4 H2O

45. C5H12 + 8 O2 5 CO2 + 6 H2O

Mixed Bag

46. (double replacement) AgC2H3O2 + NiI2 Ni(C2H3O2)2 + 2 AgI

47. (synthesis) 2 K + Br2 2 KBr

48. (decomposition) 2 AgClO3 2 AgCl + 3 O2

49. (double replacement) LiOH + HCl  LiCl + H2O

50. (single replacement) NiCl2 + F2 NiF2 + Cl2

51. (decomposition) Zn(OH)2 ZnO + H2O

52. (single replacement) Fe + Pb(NO3)2 Fe(NO3)2 [or Fe(NO3)3] + Pb

53. (synthesis) O2 + S  SO2 ( or 3 O2 + 2 S  2 SO3 or 8 O2 + S8 8 SO2)

54. (double replacement) 2 Na3PO4 + 3 Pb(NO3)2 Pb3(PO4)2 + 6 NaNO3

55. (single replacement) CaBr2 + Sn  No Rxn.

56. (double replacement) CaBr2 + 2 AgClO3 Ca(ClO3)2 + 2 AgBr

57. (decomposition) 2 CuOH  CuO + H2O

58. (synthesis) Br2 + Ba  BaBr2

59. (single replacement) Cu + AgNO3 CuNO3 [or Cu(NO3)2] + Ag

60. (singe replacement) 2 HBr + Zn  ZnBr2 + H2

61. (combustion) C3H8 + 5 O2  3 CO2 + 4 H2O

62. (synthesis) S + Fe  FeS (or 3 S + 2 Fe  Fe2S3 or S8 + 8 Fe  8 FeS)

63. (combustion) 2 C6H6 + 9 O2  12 CO2 + 6 H2O

64. (single replacement) K + NaCl  KCl + Na

65. (combustion) C2H5OH + 3 O2 2 CO2 + 3 H2O

Balancing Chemical Word Equations

  1. H2 + I2 2 HI
  2. 2 H2 + O2 2 H2O
  3. 2 Na + Cl2 2 NaCl
  4. 2 Na + 2 H2O  2 NaOH + H2
  5. HCl + NaOH  NaCl + H2O
  6. CH4 + 2 O2 CO2 + 2 H2O
  7. Na2SO4 + BaCl2 BaSO4 + 2 NaCl
  8. 2 C4H10 + 13 O2 8 CO2 + 10 H2O
  9. 6 CO2 + 6 H2O  C6H12O6 + 6 O2
  10. Fe2O3 + 3 CO  2 Fe + 3 CO2
  11. Al + 6 HCl  2 AlCl3 + 3 H2
  12. Cu + 4 HNO3 Cu(NO3)2 + 2 NO2 + 2 H2O
  13. CH4 + 3 Cl2 CHCl3 + 3 HCl
  14. C2H5OH + 3 O2 2 CO2 + 3 H2O
  15. 4 Fe + 3 O2 2 Fe2O3
  16. C3H8 + 5 O2  3 CO2 + 4 H2O
  17. O2 + 4 ClO2 2 Cl2O5
  18. 3 Ca(OH)2 + 2 H3PO4 Ca3(PO4)2 + 3 H2O
  19. 2 Al(C2H3O2)3 + 3 Mg(OH)2 2 Al(OH)3 + 3 Mg(C2H3O2)2
  20. 4 FeS + 7 O2 2 Fe2O3 + 4 SO2
  21. Ca3P2 + 6 H2O  3 Ca(OH)2 + 2 PH3
  22. Sb2S3 + 6 HCl  2 SbCl3 + 3 H2S
  23. 4 Li + O2 2 Li2O

9-2 Practice Problems

Already Balanced

  1. (synthesis) NH3 + HCl  NH4Cl
  2. (decomposition) CaCO3 CaO + CO2
  3. (synthesis) BaO + H2O  Ba(OH)2
  4. (decomposition) CH3CHO  CH4 + CO
  5. (single replacement) Zn + Cu(NO3)2 Zn(NO3)2 + Cu
  6. (decomposition) CaSO3 CaO + SO2
  7. (single replacement) Fe + H2SO4 FeSO4 + H2
  8. (decomposition) C2H6N2 C2H6 + N2
  9. (synthesis) CO + Cl2 COCl2
  10. (decomposition) MnI2 Mn + I2

To Be Balanced

  1. (synthesis) N2O5 + H2O  2 HNO3
  2. (single replacement) Mg + TiCl4 MgCl2 + Ti
  3. (single replacement) C + 2 ZnO  2 Zn + CO2
  4. (single replacement) Br2 + 2 NaI  2 NaBr + I2
  5. (synthesis) PCl3 + Cl2 PCl5
  6. (synthesis) 2 P + 3 Br2 2 PBr3
  7. (hydrolysis) CaH2 + 2 H2O  Ca(OH)2 + 2 H2
  8. (decomposition) 2 KOH + H2SO4 K2SO4 + H2O
  9. (combustion) C3H8 + 5 O2  3 CO2 + 4 H2O
  10. (combustion) 2 C6H6 + 9 O2  12 CO2 + 6 H2O

Balance and Classify each chemical equation.

1) (synthesis) 2 H2 + 2 O2 2 H2O

2) (synthesis) C + O2 CO2

3) (synthesis) 2 C + O2 2 CO

4) (synthesis) 3 H2 + N2 2 NH3

5) (synthesis) N2 + 2 O2 2 NO2

6) (synthesis) 2 N2 + 5 O2 2 N2O5

7) (combustion) C3H8 + 5 O2  3 CO2 + 4 H2O

8) (combustion) 2 C4H10 + 13 O2 8 CO2 + 10 H2O

9) (double replacement) ALREADY BALANCED

10) (double replacement) CaCO3 + 2 HCl  CaCl2 + CO2 + H2O

11) (double replacement) ALREADY BALANCED

12) (double replacement) Pb(NO3)2 + 2 KCl  PbCl2 + 2 KNO3

13) (double replacement) Na2SO4 + Pb(NO3)2 2 NaNO3 + PbSO4

14) (combustion) C2H5OH + 3 O2 2 CO2 + 3 H2O

15) (combustion) 2 CH3OH + 3 O2 2 CO2 + 4 H2O

16) (double replacement) 2 NaOH + H2SO4 Na2SO4 + 2 H2O

17) (double replacement) H2SO4 + 2 NH4OH  (NH4)2SO4 + H2

18) (combustion) 2 C2H2 + 3 O2 2 CO2 + H2O

19) (single replacement) 2 Na + H2SO4 Na2SO4 + H2

20) (decomposition) 2 NH3 3 H2 + N2

21) (single replacement) Ca + 2 HCl  CaCl2 + H2

Word Equations

1)(synthesis) 2 Li + Br2 2 LiBr

2)(synthesis) 2 Al + 3 Cl2 2 AlCl3

3)(decomposition) 2 HgO  2 Hg + O2

4)(single replacement) 2 KI + Cl2 2 KCl + I2

5)(single replacement) Zn + 2 HCl  ZnCl2 + H2

6)(decomposition) 2 Al2O3 4 Al + 3 O2

7)(single replacement) 2 K + 2 H2O  2 KOH + H2

8)(decomposition) 2 Ni(ClO3)3 2 NiCl3 + 9 O2

9)(double replacement) Ca3(PO4)2 + 3 H2SO4  3 CaSO4 + 2 H3PO4

10) (no type) 3 O2 2 O3

11)(synthesis) 4 Na + O2 2 Na2O

12)(synthesis) Mg + I2 MgI2

13)(synthesis) CaO + CO2 CaCO3

14)(single replacement) 2 K + MgCl2 2 KCl + Mg

15)(direct combination) H2 + Cl2 2 HCl

16)(no type) NH3 + 3 O2 2 HNO3 + H2O

17)(double replacement) 3 Ca(OH)2 + 2 H3PO4 Ca3(PO4)2 + 6 H2O

18)(double replacement) 2 FeCl3 + 3 Na2CO3 Fe2(CO3)3 + 6 NaCl

19)(double replacement) 2 Al(OH)3 + 3 H2SO4 Al2(SO4)3 + 6 H2O

20)(single replacement) 2 Al + Fe2O3 Al2O3 + 2 Fe

Balancing Chemical Equations (EXTRA)

1)(double replacement) 2 HC2H3O2 + Ba(OH)2 Ba(C2H3O2)2 + 2 H2O

2)(single replacement) Zn + H2SO4  ZnSO4 + H2

3)(decomposition) Ca(HCO3)2 CaCO3 + H2O + CO2

4)(synthesis) 2 NH3 + H2SO4 (NH4)2SO4

5)(double replacement) 3 BaCl2 + Al2(SO4)3 3 BaSO4 + 2 AlCl3

6)(synthesis) P2O5 + 3 H2O  2 H3PO4

7)(single replacement) 2 Al + 3 H2SO4 Al2(SO4)3 + 3 H2

8)(single replacement) Cl2 + 2 NaBr  2 NaCl + Br2

9)(combustion) C3H8 + 5 O2  3 CO2 + 4 H2O

10)(double replacement) 2 NaHCO3 + H2SO4 Na2SO4 + 2 H2O + 2 CO2

11)(single replacement) Cu2O + H2 2 Cu + H2O

12)(single replacement) Ca + 2 H2O  Ca(OH)2 + H2

13)(synthesis) 3 H2 + N2 2 NH3

14)(decomposition) Sn(ClO3)4 SnCl4 + 6 O2

15)(double replacement) 2 FeCl3 + 3 (NH4)2S  6 NH4Cl + Fe2S3

16)(synthesis) H2 + I2 2 HI

17)(double replacement) 2 KOH + CO2 K2CO3 + H2O

18)(synthesis) 2 P + 3 I2 2 PI3

19)(synthesis) 2 Cu + O2 2 CuO

20)(double replacement) CaCO3 + 2 HCl  CaCl2 + H2O + CO2

21)(double replacement) H2S+ Ca(NO3)2 2 HNO3 + CaS

22)(double replacement) Pb(NO3)2 + Na2CO3 PbCO3 + 2 NaNO3

23)(hydrolysis) Na2O2 + H2O  2 NaOH + O2

24)(double replacement) P2O5 + 6 NaOH  2 Na3PO4 + 3 H2O

25)(double replacement) H2SO4 + 2 HBr  2 H2O + Br2 + SO2

26)(double replacement) 3 PbO + ZnS  ZnO + SO2 + 3 Pb

27)(synthesis) 2 Na + F2 2 NaF

28)(double replacement) Pb(NO3)2 + Na2CO3 PbCO3 + 2 NaNO3

29)(synthesis) 2 Cu + O2 2 CuO

30)(no type) 4 NH3 + 5 O2 6 H2O + 4 NO

31)(combustion) C6H12O6 + 9 O2 6 CO2 + 6 H2O

32)(single replacement) 2 Al + 3 Hg(NO3)2 2 Al(NO3)3 + 3 Hg

33)(double replacement) SnO2 + 4 HCl  SnCl4 + 2 H2O

34)(double replacement) 2 H3PO4 + 3 Ca(OH)2 Ca3(PO4)2 + 6 H2O

35)(decomposition) Sn(ClO3)4 SnCl4 + 6 O2

36)(double replacement) 3 BaCl2 + Al2(SO4)3 3 BaSO4 + 2 AlCl3

37)(no type) Cu2S + O2 Cu2O + SO2

38)(no type) Mg3N2 + 3 H2O  2 NH3 + 3 Mg(OH)2

39)(synthesis) 2 Sb + 3 Cl2 2 SbCl3

40)(single replacement) Cu + 2 H2SO4 CuSO4 + SO2 + 2 H2O