Final answer:
Mixing alcohol and water The example of a chemical change in the provided options is 'Burning paper', as it results in new substances being formed, which is a characteristic of chemical changes.
Step-by-step explanation:
The example of a chemical change given in the question is 'Burning paper'. When paper burns, it is undergoing combustion, where the materials in the paper react with oxygen in the air to form new substances such as carbon dioxide and water vapor. This process results in a permanent change, indicating that a chemical reaction has taken place. This is supported by observing that burning of gasoline, souring of milk, and iron rusting are also chemical changes, as they produce new substances with different properties from the original materials.
The other provided options are instances of physical changes. Mixing alcohol and water, melting ice, and dissolving sugar in tea do not produce new substances; the original materials can be retrieved through physical processes like distillation, freezing, or evaporation.