Balancing Chemical Equations

Ca + HCl a CaCl2 + H2 Ca + 2 HCl a CaCl2 + H2 Single Replacement +2 -1 1. calcium + hydrochloric acid (HCl) a calcium chloride and hydrogen (gas) Ca + HCl a CaCl2 + H2 Formula equation Balanced chemical equation Ca + 2 HCl a CaCl2 + H2 Single Replacement

MgF2 + Pb(NO3)2 a Mg(NO3)2 + PbF2 +2 -1 +2 -1 2. magnesium fluoride + lead(II) nitrate a magnesium nitrate + lead(II)fluoride +2 -1 +2 -1 MgF2 + Pb(NO3)2 a MgNO3 + PbF Mg(NO3)2 + PbF2 MgF2 + Pb(NO3)2 a Mg(NO3)2 + PbF2 Double Replacement

3. aluminum oxide + water a aluminum hydroxide +3 -2 Al O + H2O a

3. aluminum oxide + water a aluminum hydroxide +3 -1 Al2O3 + H2O a Al OH Formula equation Al2O3 + H2O a Al(OH)3 Balanced chemical equation Al2O3 + 3 H2O a 2Al(OH)3 Synthesis

4. Ba(OH)2 + HBr a BaBr2 + HOH 4. Ba(OH)2 + 2 HBr a BaBr2 + 2 HOH Formula equation 4. Ba(OH)2 + 2 HBr a BaBr2 + 2 HOH Balanced chemical equation Double Replacement

5. chlorine + magnesium iodide a magnesium chloride + iodine Cl2 + MgI2 a MgCl2 + I2 Single Replacement

6. nickel(III)phosphate + potassium sulfate a nickel(III)sulfate + potassium phosphate Ni+3PO4-3 + K+1SO4-2 a

NiPO4 + K2SO4 a Ni+3SO4-2 + K+1PO4-3 NiPO4 + K2SO4 a Ni2(SO4)3 + K3PO4 6. nickel(III)phosphate + potassium sulfate a nickel(III)sulfate + potassium phosphate NiPO4 + K2SO4 a Ni+3SO4-2 + K+1PO4-3 NiPO4 + K2SO4 a Ni2(SO4)3 + K3PO4 Formula equation 2 NiPO4 + 3 K2SO4 a Ni2(SO4)3 + 2 K3PO4 Balanced chemical equation Double Replacement

7. sodium + zinc oxide a sodium oxide + zinc +2 -2 7. sodium + zinc oxide a sodium oxide + zinc +1 -2 Na + ZnO a Na O + Zn Na + ZnO a Na2O + Zn Formula equation 2 Na + ZnO a Na2O + Zn Balanced chemical equation Single Replacement

8. strontium sulfite a sulfur dioxide + strontium oxide Sr+2SO3-2 a SO2 + Sr+2O-2 SrSO3 a SO2 + SrO Balanced chemical equation Decomposition

9. potassium hydroxide a potassium oxide + water +1 -1 +1 -2 9. potassium hydroxide a potassium oxide + water KOH a K2O + H2O Formula equation 2 KOH a K2O + H2O Balanced chemical equation Decomposition

10. ammonia + oxygen a nitrogen dioxide + water NH3 + O2 a NO2 + H2O 4 NH3 + 7 O2 a 4 NO2 + 6 H2O

11. Al + O2 a aluminum oxide Al + O2 a Al2O3 4 Al + 3 O2 a 2 Al2O3 +3 -2 11. Al + O2 a aluminum oxide Al + O2 a Al2O3 Formula equation 4 Al + 3 O2 a 2 Al2O3 Balanced chemical equation Synthesis

of hydroxides produce water 12. Fe(OH)2 a Decomposition of hydroxides produce water Fe(OH)2 a FeO + H2O Balanced chemical equation Decomposition

13. Ba + Ni(OH)3 a Ba+2OH-1 + Ni Ba + Ni(OH)3 a Ba(OH)2 + Ni Formula equation 3 Ba + 2 Ni(OH)3 a 3 Ba(OH)2 + 2 Ni Balanced chemical equation Single Replacement

of carbonates produce CO2 14. sodium carbonate a Decomposition of carbonates produce CO2 Na2CO3 a Na2O + CO2 Balanced chemical equation Decomposition

15. KOH + H2SO4 a K+1SO4-2 + H+1OH-1 KOH + H2SO4 a K2SO4 + HOH Double replacement 15. KOH + H2SO4 a K+1SO4-2 + H+1OH-1 KOH + H2SO4 a K2SO4 + HOH Formula equation 2 KOH + H2SO4 a K2SO4 + 2 HOH Balanced chemical equation Double Replacement

16. nitrogen + hydrogen a NH3 (ammonia) Remember Br I N Cl H O F N2 + H2 a NH3 N2 + 3 H2 a 2 NH3 Balanced chemical equation Synthesis

Ca(ClO3)2 + Na3PO4 a Ca3(PO4)2 + NaClO3 Formula equation 3 Ca(ClO3)2 + 2 Na3PO4 a Ca3(PO4)2 + 6 NaClO3 Balanced chemical equation Double Replacement

18. hydrogen gas + copper(II) oxide a H2 + Cu+2O-2 a ? H2 + CuO a H+1O-2 + Cu H2 + CuO a H2O + Cu Balanced chemical equation Single Replacement

of chlorates produce chlorides and oxygen 19. NaClO3 a Decomposition of chlorates produce chlorides and oxygen 2NaClO3 a 2NaCl + O2 Balanced chemical equation Decomposition

20. KI + Cl2 a K+1Cl-1 + I2 KI + Cl2 a KCl + I2 chlorine replaces I 20. KI + Cl2 a K+1Cl-1 + I2 KI + Cl2 a KCl + I2 Formula equation 2 KI + Cl2 a 2 KCl + I2 Balanced chemical equation Single Replacement

21. H2 + S a hydrogen sulfide H2 + S a H2S H2 + S a H2S Synthesis +1 -2 21. H2 + S a hydrogen sulfide H2 + S a H2S Formula equation H2 + S a H2S Balanced chemical equation Synthesis

22. NH4OH a ? NH4OH a ? + H2O NH3 Decomposition …. of hydroxides produces water. NH4OH a ? + H2O NH3 Balanced chemical equation Decomposition

0 – 4 A 5 – 8 B 9 – 12 C 13 – 16 D