Chemistry: Electro chemistry help!!!!!! PLEASE? Photographic film contains a thin layer of silver bromide (AgBr) Crystals. When the light hits the film. Electrons are transferred from the Br- to the Ag + ions. Dark patches of metallic silver appear on the film where the lens of the camera focused light on the film. a) why is this considered a redox reaction? b) write the oxidation half reaction. C) what substance is the anode d) write the reduction half reaction e) what substance is the reducing agent f) what would be the e* of the tiny cell on the photo graphic film g)is this cell electrochemical or electro lytic please help me final exam tomorrow and i dont understand this unit... just give me hints or if u can show me how i would do it... steps would help too thankyou in advance!!