What makes scientific investigation similar to other types of investigations

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?

Iwould appreciate if someone could me.