While surveying an uncharted subterranean cavern, a deep-space mineralogist drops a fragment of a newly discovered metallic ore into an acidic geothermal pool. The contact immediately triggers vigorous effervescence, releases intense thermal energy, and deposits an insoluble crimson precipitate that cannot be restored to its original state through cooling or filtration. Which statement best explains why this interaction is classified as a chemical change rather than a physical change?

A) The metallic ore altered its physical shape and disintegrated into microscopic particles suspended uniformly throughout the brine.

B) Thermal energy transferred from the warmer liquid to the cooler ore until both substances reached thermal equilibrium.

C) The constituent atoms rearranged through bond breaking and bond formation to create entirely new substances with distinct identities.

D) The geothermal solution underwent a phase change caused solely by ambient geothermal heating, converting liquid into vapor reversibly.

Chemical changes Original Scenario-Based Practice

Chemistry · Matter · Chemistry · Properties & Changes of Matter

1 Chemistry practice questions on Chemical changes. Questions built around original scenarios.

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Matter · Chemistry

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