Silver nitrate —> Zinc nitrate + SilverZn + AgNO3 → Ag + Zn(NO3)2 : Put a "2" in FRONT of the AgNO3 to balance the NO3 (nitrate). Balance the Ag on the product side. => Zn + 2AgNO3 = 2Ag + Zn(NO3)2 Aluminium + Copper chloride => Aluminium chloride + CopperAI + CuCI2 => AICI3 + Cu : Put a coefficient of two in front of the AlCl3. Change the coefficient in front of CuCl2 to balance the chlorine atoms. => 2Al + 3CuCl2 = 2AlCl3 + 3Cu Barium chloride + Potassium sulphate => Barium sulphate + Potassium chloride BaCl2 + K2 SO4 => BaSO4 + KCl : Change the coefficient in front of the KCl to balance the equation. Put a "2" in front of the KCl on the product side of the equation. => BaCl2 + K2 SO4 = BaSO4 + 2KClPotassium bromide (AQ) + Barium Iodide (aq) => Potassium Iodide (aq) + Barium bromide (s)2KBr(aq)+ BaI2(aq)→ 2KI(aq )+ BaBr2(s)It is a double diaplacement reaction. A double displacement reaction is a TYPE of reaction in which two reactants exchange ions to form two new COMPOUNDS.Zinc carbonate (s) => Zinc oxide (s) + Carbon dioxide (g) ZnCO3 (s) => ZnO (s) + CO2 (g)It is a decomposition reaction. A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. Hydrogen (g) + Chlorine (g) => Hydrogen Chloride (g)H2 (g) + CL2 (g) => 2HCl (g)It is a combination reaction. A combination reaction is a reaction where two or more elements or compounds combine to form a single compound (product).