Which of the following observations provides conclusive evidence that a chemical reaction, rather than solely a physical change, has taken place?

A) Formation of an insoluble precipitate upon mixing two clear aqueous solutions

B) Condensation of water vapor on the outside of a cold beaker

C) Dissolution of solid sodium chloride crystals in liquid water

D) Transition of liquid water into steam upon reaching its boiling point

Evidence of chemical reactions Knowledge-Based Practice

Chemistry · Matter · Chemistry · Properties & Changes of Matter

1 Chemistry practice questions on Evidence of chemical reactions. Questions that assess core concepts and understanding.

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Matter · Chemistry

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