Question

A scientist is performing and experiment on a powder . Which is the following sign that a chemical change has definitely occurred during his experiment?

A. The powder catches on fire
B. The powder release bubbles
C. The powder heats up
D. The powder breaks apart into smaller particles

Answer 1

A. The powder catches on fire.

Step-by-step explanation:

A chemical change is when a substance combines with another to form a new substance. Using the process of elimination, we can rule out C and D because it is still powder after it heats up or breaks into smaller pieces. We know it's A because if it is on fire, it will turn to ash or another substance and changes the particles.

Answer 2

b The powder release bubbles
hope this helps!!!