*
*
*
The oxidation
of aluminum is more likely than the oxidation of zinc.
These potentials indicate the relative
thermodynamic
tendency for the indicated
half-reaction to occur.
Al
<--> Al+3 + 3 e– E = -1.66
volts
Zn <--> Zn+2 + 2 e– 
E = -0.763 volts
Cu <--> Cu+2 + 2 e–E = +0.34
volts
E = -0.763 voltsCu <--> Cu+2 + 2 e–
E = +0.34
volts