Question

which observations from the investigations provide evidence that a chemical change took place?
a. investigations 2 and 3
b. investigations 1, 3, and 4
c. investigations 1, 4, and 5
d. investigations 2, 3, and 5

Explanation:

Chemical changes show signs like new substances formed, color - change, gas evolution. Without details of investigations, assume based on common signs.

Answer:

No answer can be given without details of investigations.