Which of the following is an example of a chemical change?

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BlackTom AI · Accepted Answer

Consider what counts as a chemical change versus a physical change in this question.
Option 1: Adding blue food colouring to a glass of water. This is primarily a physical process in which the dye dissolves and mixes with water; no new substance is formed, so it does not illustrate a chemical change.
Option 2: Evaporating water. This is a phase change from liquid to gas and again involves no chemical transformation of the water itself—it's a physical change, not a chemical one.
Option 3: Melting an ice cube. This is another phase change (solid to liquid) driven by heat, but it does not create new substances; the water molecules remain H2O, just in a different state, so it’s physical.
Option 4: Baking a cake. Here, heat triggers chemical reactions among ingredients (such as baking powder releasing carbon dioxide, proteins denaturing and coagulating, starches gelatinizing). These reactions create new substances and irreversible changes in the material, which is characteristic of a chemical change.
Option 5: Ripping a sheet of paper into smaller pieces. This is simply a change in size and shape; the paper’s chemical composition remains the same, so it is a physical change.

Which of the following is an example of a chemical change?

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