Burning of paper
Burning of paper is a chemical change. Here's why:

Chemical Change
A chemical change, also known as a chemical reaction, occurs when the substances involved undergo a transformation, resulting in the formation of new substances with different properties.

Burning of Paper
When paper is burned, it undergoes a chemical change. The combustion process involves the decomposition of the paper's organic compounds, such as cellulose, into simpler molecules like carbon dioxide, water vapor, and ash.

Evidence of Chemical Change
There are several pieces of evidence that indicate the burning of paper is a chemical change:

1. Formation of New Substances: The paper is transformed into different substances during combustion, including carbon dioxide, water vapor, and ash. These new substances have different properties compared to the original paper.

2. Release of Energy: Burning paper releases energy in the form of heat and light. This energy is a result of the chemical reactions taking place during combustion.

3. Irreversibility: Once paper is burned, it cannot be easily reversed or undone. The original paper cannot be recovered, and the resulting ash cannot be converted back into paper.

4. Color Change: The color of the paper changes during combustion. It typically turns black or brown due to the formation of carbon compounds.

5. Production of Smoke: Burning paper produces smoke, which consists of tiny particles of carbon and other combustion byproducts. This smoke is an indication of chemical reactions occurring.

Conclusion
Based on the evidence presented, it is clear that the burning of paper is a chemical change. The transformation of the paper into new substances, the release of energy, irreversibility, color change, and production of smoke all support the classification of this process as a chemical reaction.