When the tin coating on an iron can is scratched, rust will form. Use the activity series in Table to explain why this happens.
Table
Metal | Ion | ||
Most active oxidize easily | Li(s) | → | Li+(aq) + e− |
K(s) | → | K+(aq) + e− | |
Ca(s) | → | Ca2+ (aq) + 2e− | |
Na(s) | → | Na+(aq) + e− | |
Mg(s) | → | Mg2+ (aq) + 2 e− | |
Al(s) | → | Al3+ (aq) + 3 e− | |
Zn(s) | → | Zn2+ (aq) + 2 e− | |
Cr(s) | → | Cr3+ (aq) + 3 e− | |
Fe(s) | → | Fe2+ (aq) + 2 e− | |
Ni(s) | → | Ni2+ (aq) + 2 e− | |
Sn(s) | → | Sn2+ (aq) + 2 e− | |
Pb(s) | → | Pb2+ (aq) + 2e− | |
H2(g) | → | 2H+ (aq) + 2 e− | |
Cu(s) | → | Cu2+ (aq) + 2 e− | |
Ag(s) | → | Ag+ (aq) + e− | |
Least active oxidize with difficulty | Au(s) | → | Au3+ (aq) + 3e− |
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