Answer:
Burning paper.
Step-by-step explanation:
Remember that a chemical change represents the change in the chemical composition of matter, the opposite case would be a physical change, which doesn't relate to the composition of matter, its composition remains the same during the change, so let's analyze each case:
- Tearing a piece of paper would be a physical change, because paper is still being paper in the process.
- Water boiling would be a physical change too, because water just changes its phase, but not its chemical composition.
- Burning paper represents a chemical change, because 'burning' is the reaction of a substance with oxygen (usually), to produce another type of substances such as carbon dioxide.
- Adding food coloring to water is a dissolution, which doesn't represent a chemical change because there is no change in the chemical structure of water and food coloring.
Based on this logic, the answer would be that a chemical change would be burning paper.