Asked by Fatima

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.

Answers

Answered by DrBob222
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.
Answered by HarleyQuinn<3
The answer is A :D
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