Question

In a science experiment, Javi concludes that a chemical reaction has occurred. What evidence would support this conclusion?

A
a substance melted

B
a substance's color and odor changed

C
a substance's mass and texture changed

D
new atoms were created

Answer 1

B) a substance's color and odor changed Explanation: A signal that a chemical change has occurred is when its odor (its smell) or its appearance has changed.