Question

select the correct answer. which event represents a chemical change? a. breaking glass b. chopping wood c. crushing a can d. milk turning sour

Explanation:

A chemical change results in the formation of new substances with different chemical properties. Breaking glass, chopping wood, and crushing a can are physical changes as they only change the physical form, not the chemical composition. Milk turning sour is a chemical change because bacteria convert lactose into lactic acid, creating new substances.

Answer:

D. milk turning sour