Use the Following to Answer Questions 55-58

Essay

Use the following to answer questions 55-58:
-The galvanic cell shown above uses the half-cells Mg²⁺/Mg and Zn²⁺/Zn, and a salt bridge containing KCl(aq).The voltmeter gives a positive voltage reading.Identify A and write the half-reaction that occurs in that compartment.Does the size of the electrode A increase or decrease during operation of the cell? What is the voltmeter reading?