Sodium chloride reacts with copper sulfate to produce sodium sulfate and copper chloride. 2 upper N a upper C l (a q) plus upper C u Uppe S upper O subscript 4 (a q) right arrow upper N a subscript 2 upper S upper O subscript 4 (a q) plus upper C u upper C l subscript 2 (s).

This equation represents a

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".