a yes
b yes
c either
d no
c can be either. If it heats up because you built a fire under it that is a physical change. If it heats up because of the experiment being conducted it is a chemical change.
A scientist is performing an experiment on a
powder. Which of the following is a sign that a chemical change has definitely occurred during his experiment?
The powder catches on fire.
The powder releases bubbles.
The powder heats up.
The powder breaks apart into smaller particles.
2 answers
The answer is A :D