Chemistry, 16.11.2019 21:31 ashyding4800

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...