Balancing Chemical Equations

A chemical equation describes in a formula the identities and quantities of substances involved in a chemical reaction. Rules for balancing :

Word Problems

  1. Sodium reacts with chlorine to form sodium chloride (NaCl)
     
     
  2. Silver (Ag) and sulfur (S) combine to form silver sulfide (Ag2S)
     
     
  3. Potassium chlorate (KClO3) decomposes into potassium chloride (KCl) and oxygen gas (O2)
     
     
  4. Magnesium (Mg) and oxygen gas (O2) combine to form magnesium oxide (MgO)
     
     
  5. Aluminum oxide (Al2O3) decomposes into aluminum and oxygen gas (O2)
     
     
  6. Hydrogen gas (H2) reacts with nitrogen gas (N2) to form ammonia (NH3)
     
     
  7. Hydrogen gas (H2) and oxygen gas (O2) combines to form water (H2O)
     
     
  8. Phosphorus and oxygen gas (O2) combine to form phosphorus pentoxide (P2O5)
     
     
  9. Carbon and iron oxide (Fe2O3) react to form iron and carbon monoxide (CO)
     
     
  10. Potassium chloride (KCl) reacts with fluorine gas (F2) to form potassium fluoride (KF) and chlorine gas (Cl2)
     
     
  11. Silver oxide (Ag2O) decomposes into silver and oxygen gas (O2)
     
     
  12. Carbon dioxide (CO2) and water (H2O) react to form glucose (C6H12O6) and oxygen gas (O2)

Balancing Chemical Equations Problems

  1. ____ Na + ____ Cl   →   ____ NaCl
     
     
  2. ____ Ag + ____ S   →   ____ Ag2S
     
     
  3. ____ KClO3   →       ____ KCl + ____ O2
     
     
  4. ____ Mg + ____ O2   →   ____ MgO
     
     
  5. ____ Al2O3   →   ____ Al + ____ O2
     
     
  6. ____ H2 + ____ N2   →   ____ NH3
     
     
  7. ____ H2 + ____ O2   →   ____ H2O
     
     
  8. ____ P + ____ O2   →   ____ P2O5
     
     
  9. ____ C + ____ Fe2O3   →   ____ Fe + ____ CO
     
     
  10. ____ KCl + ____ F2   →   ____ KF + ____ Cl2
     
     
  11. ____ Ag2O   →   ____ Ag + ____ O2
     
     
  12. ____ CO2 + ____ H2O   →   ____ C6H12O6 + ____ O2