Do the atomic mass times the number of atoms you have. That'll give you your answer. Hope it helps!
Answer:
B) Cu(s) is metal that reacts spontaneously with NiCl2(aq).
Answer:
C. A physical change.
Explanation:
A liquid is cooled during an investigation causing it solidify.Which of the following most likely occurred?
A. Absorption of heat. NO. Heat was released.
B. A chemical change. NO. It was a physical change
C. A physical change. YES. The physical change is called solidification.
D. Formation of a new compound. NO. This would be a chemical change.
