a sugar cube dissolving in water. ice cubes forming in a freezer. ice cream melting in a bowl. a cake baking in an oven.
Which of the following represents a chemical reaction?

Options:
- a sugar cube dissolving in water.
- ice cubes forming in a freezer.
- ice cream melting in a bowl.
- a cake baking in an oven.

a cake baking in an oven.