Do precipitates ever form in single replacement reactions?
For example, if the reaction was Ca + ZnSO
4 ![right arrow :rarrow:](https://www.chemicalforums.com/Smileys/classic/rarrow.png)
Zn + CaSO
4, would the CaSO
4 be considered aqueous or a precipitate?
Also, are the halogens F
2, Cl
2, Cr
2, and I
2 more reactive than any other elements?