Solution to Chemistry Problem (3)

Solution:
1) Redox reactions can produce electricity since they involve a transfer of electrons.
2) - Various forms of batteries and cells produce electricity through redox reactions.- The galvanic cells is a device that converts chemical energy into electric energy
3) No, we can’t use metals of the same nature since one metal must have more tendency to lose electrons than the other in order for a galvanic cell to generate electricity.
4) Anode: (3) since it is the electrode that loses electrons
Cathode: (2) since it is the electrode that gains the electrons5)
Oxidation half reaction: Zn → Zn2+ + 2e
Reduction half-reaction: (Ag+ + 1e→ Ag) × 2
Overall Reaction: Zn + 2Ag+→ 2Ag + Zn2+
6) Zn/Zn2+-salt bridge - Ag+ /Ag
7) The anode becomes thinner, since it loses electrons so the atoms of zinc metal (solid) are oxidized to becomes zinc ions (aqueous), which become part of the solution.
The cathode becomes thicker, since silver ions (aqueous) are being reduced to become silver atoms (solid) on the silver strip making it thicker.