October 6, 2015

Homework Help: chemistry

Posted by Fatima on Thursday, February 7, 2013 at 10:02am.

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.

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