Al+CuS4 yeilds Al2{S4)3+Cu What kind of chemical reaction is this?

Answer 1

It is the substitution reaction because Al have much higher redox potential then Cu it will replace in almost all compounds. Aluminum + Copper tetrasulfide = Copper + Aluminum tetrasulfide.

Answer 2

An imaginary one. The cationic group is probably sulfate (SO4=). How about learning real chemistry?

Answer 3

substitution