Is CaSO4 Ionic or covalent

Answer 1

You cannot tell from a formula whether an compound is ionic or molecular. The distinction is arbitrary at best, and there are actually very few purely ionic compounds. Al2S3 will be somewhere between ionic and covalent. Depending what level you are at and wherer you are taught different classifications of aluminium sulfide are given. See link for one view.
Al2S3 is a colorless high melting compound, the aluminium atoms are in tetrahedral coordination in the most stable forms. This is line with the size difference between S and Al. The electronegativity difference between Al and S is ony 0.97. These are factors that need to be taken into account when making a decision. My view is partially covalent partially ionic!

Answer 2

Ionic because Ca is a metal. When a metal and a nonmetal (like CaO) are combined it's ionic.

Answer 3

Ionic. A calcium ion bonds with a carbonate ion. (However, within the carbonate ion, there are covalent bonds.)

Answer 4

It is an ionic compound.

But no compound is perfectly ionic or covalent.

Even ionic compounds have covalent character to some character(polarisation).

Answer 5

Calcium carbonate is an ionic compound.

Answer 6

It's an ionic molecular compound

Answer 7

Yes!