Answer: Copper sulfate has oxygen element in it while copper sulfide does not have.
Step-by-step explanation:
Copper sulfate is formed by the combination of copper and sulfate ions. The chemical formula for this compound is

It is formed by the combination of atoms of copper, sulfur and oxygen elements.
Copper sulfide is formed by the combination of copper and sulfide ions. The chemical formula for this compound is

It is formed by the combination of atoms of copper and sulfur elements.
Hence, copper sulfate has oxygen element in it while copper sulfide does not have.