Question

Which is a sign that a chemical change is occurring????

a: boiling
b:bubbling
c:freezing
d:melting

Answer 1

B.) Bubbling

Step-by-step explanation:

The usual signs of a chemical change are color changes, the formation of a precipitate, the formation of a gas, an odor change, and temperature changes. Bubbles are an example of a formation of gas.

Answer 2

B. Bubbling

Step-by-step explanation:

The formation of bubbles are gas fumes, which are new products. The rest are only physical changes.