What evidence is there that a chemical reaction is occurring in dropping an alka seltzer tablet into a glass of water

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

so what is the problem with your lab report and whats the subject of the lab report? i will you