Question 6 On abrading the stainless steel and the aluminium, how do the ranking change in the galvanic series? O aluminium became more cathodic and stainless steel more anodic aluminium became more anodic and stainless steel more anodic O aluminium became more anodic and stainless steel more cathodic no real change in the galvanic series Question 7 This change for the abraded metals comes about because: O Abrading cold works the surface abrading puts a surface layer on the metal that protects it from further corrosion abrading removes the protective oxide coating from the metal O abrading makes no difference to the potential difference 1 pts 1 pts Question 8 Relative size of the anode and cathode: The results for the rate of corrosion part of this experiment indicate that O if there is a large cathode relative to the anode, then corrosion will occur quickly if there is a small cathode relative to the anode, then corrosion will occur quickly Question 9 This is because 1 pts O large anodes, compared to the cathode, produce a large number of electrons and therefore drive the cathodic reaction resulting in a faster corrosion rate 1 pts O large cathodes require less electrons and therefore the anode dissolves more slowly large cathodes require more electrons than small cathodes and thus the anode must dissolve faster small anodes, compared to the cathode, cannot produce enough electrons and thus the corrosion rate is slowed Question 10 For the tin plated steel: Tin is more anodic than steel, and once the steel is exposed the tin corrodes Tin is more cathodic than steel and once the steel is exposed the steel will corrode There is a small cathode /large anode situation here meaning the steel will corrode quickly There is a small cathode /large anode situation here meaning the tin will corrode quickly 1 pts