Final answer:
The question is about the functioning of an electrochemical cell, specifically the roles of the anode and cathode and the movement of electrons and protons in the system. True statements include the anode losing mass due to oxidation and the cathode gaining mass due to reduction. The equilibrium condition described reflects the changing concentrations as the electrochemical reaction proceeds.
Step-by-step explanation:
The question appears to be about an electrochemical cell, where the anode is the electrode where oxidation occurs and the cathode is where reduction occurs. The statement 'the iron electrode is the anode so it will decrease in mass as it loses electrons' is true as the anode is where oxidation happens, which involves the loss of electrons and mass from the electrode material. For the cathode, the statement 'Pb is the cathode (i.e. gaining electrons)' is true if lead is indeed acting as the reduction site in the electrochemical cell. The statement 'lead is more positive (i.e. iron = anode)' can be misleading without context, but generally, the anode is considered negative in a galvanic cell. The statement about equilibrium, 'in equilibrium we are approaching 0, but not achieving it. It'll just go to the point where there is no push, so concentration won't reach 0', refers to the fact that while the reaction approaches equilibrium, the concentrations do not completely deplete.
From the provided statements about electrochemistry, it appears that b and e may be true under certain conditions, but with the information given, it's impossible to assess their accuracy completely. Statements a, c, and d about battery operation and electron flow are consistent with the principles of electrochemistry. Specifically, the number of protons (which refers to the flow of positive charge) should be equal entering and leaving the battery, as should the number of electrons. The discussion about the cell potential in references (17.3.8) and (20.6.9) supports the idea of changing concentrations and potential as reactions proceed, but does not directly validate or invalidate the provided statements.