What are two scientific contribution made by galileo gailei

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

Can someone me with 3 and 4 plz. this is for masteries test.

Calculate the concentration of all species in a 0.165 m solution of h2co3.