A colour change was observed, so we know that a chemical reaction occurred...
we further know that the blue solid was a compound and NOT an element. The blue substance evolved (i) a gas, and (ii) a new white substance. Given the two new species formed, the starting material could not have been an element. Elements are the simplest chemical substances, and an element as the sole starting material cannot be be chemically transformed into new species.
Answers & Comments
Answer:
element because water is blue in that is element
Answer:
Compound
Explanation:
A colour change was observed, so we know that a chemical reaction occurred...
we further know that the blue solid was a compound and NOT an element. The blue substance evolved (i) a gas, and (ii) a new white substance. Given the two new species formed, the starting material could not have been an element. Elements are the simplest chemical substances, and an element as the sole starting material cannot be be chemically transformed into new species.