Which of the following involves a chemical change?
Burning a sugar cube involves a chemical change.
When a sugar cube is burned, it undergoes a chemical reaction that transforms it into new substances, such as carbon dioxide and water. This process alters the chemical structure of the sugar, indicating that a chemical change has occurred, as opposed to a mere physical alteration.
Crushing a can is a physical change, as it alters the shape and size of the can without changing its chemical composition. The material of the can remains aluminum, and no new substances are formed during this process.
Boiling water is also a physical change, as it involves the transition of water from a liquid state to a gaseous state (steam). This process does not change the chemical identity of water; it remains H₂O before and after boiling.
Breaking a bottle is a physical change since it results in smaller pieces of glass without altering the chemical structure of the glass itself. The composition of the broken glass remains the same; only its form is affected.
Chemical changes involve transformations that alter the chemical identity of a substance, as seen in the burning of a sugar cube, which produces new compounds. In contrast, crushing, boiling, and breaking items result in physical changes where the original substances retain their chemical identities. Understanding these distinctions is crucial for recognizing the nature of various processes in chemistry.
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