Physics, 28.08.2019 11:50, tdyson3p6xvtu

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...