In the presence of hydrogen sulfide, silver oxidizes to form silver sulfide (silver tarnish). It forms a black film on the surface of silver. 4Ag+2H2S+O2→2Ag2S+2H2O One way to reverse the chemical reaction and turn silver sulfide back into silver is by immersing the silver in an aluminum container filled with a hot solution of sodium bicarbonate. Metals like aluminum have a greater affinity for sulfur than silver. This tarnish-removal method uses a chemical reaction to convert the silver sulfide back into silver, resulting in no net loss of silver. The reaction between silver sulfide and aluminum takes place in the presence of a sodium bicarbonate (NaHCO3) solution, resulting in the transfer of sulfur atoms from silver to aluminum, freeing the silver metal and forming aluminum sulfide. The reaction can be summarized as follows: when silver sulfide reacts with aluminum, silver sulfide is reduced to form silver and aluminum is oxidized to form aluminum sulfide. Complete the balanced chemical equation for the reaction, showing the formation of silver metal from silver sulfide in the presence of aluminum metal. Express your answer as the products of a chemical equation.