Chemistry, 29.08.2019 14:10 bailey1025

Ascientist 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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Ascientist is performing an experiment on a powder. which of the following is a sign that a chemical...