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Stells [14]
2 years ago
8

What is the hallmark of a chemical change?

Biology
1 answer:
Oksi-84 [34.3K]2 years ago
4 0
There are five signs that indicate a chemical reaction has occurred: odor, energy change, gas bubbles, precipitate formation, and color change. When any of these changes occur, the reaction is irreversible and cannot be undone.
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