Question

when aluminum is added to a solution of calcium sulfate, which of the following occur?
partial activity series
k ca mg al zn fe ni pb h cu ag
f₂ cl₂ br₂ i₂
no reaction occurs.
aluminum and calcium combine to form a new compound.
solid calcium precipitates.
the aluminum dissolves into the solution.

Explanation:

To determine if a reaction occurs between aluminum (Al) and calcium sulfate ($CaSO_4$), we use the activity series. In a single - displacement reaction, a more reactive metal can displace a less reactive metal from its compound. Looking at the activity series provided (K, Ca, Mg, Al, Zn, Fe, Ni, Pb, H, Cu, Ag), calcium (Ca) is more reactive than aluminum (Al). For a single - displacement reaction to occur where a metal displaces another metal from its salt solution, the displacing metal must be more reactive than the metal in the salt. Since Al is less reactive than Ca, Al cannot displace Ca from $CaSO_4$. So, no reaction will take place.

Answer:

A. No reaction occurs.