The example that demonstrates the reversibility of a chemical change is refreezing carbon dioxide gas into dry ice.
Dehydrating sugar water involves removing water, which is generally more difficult to reverse, depending on the situation. The rotting of eggs is a chemical change that is irreversible, as it involves decomposition and cannot be undone. In contrast, the process of turning carbon dioxide gas into dry ice (solid CO₂) can be reversed by warming it up, allowing it to sublimate back into gas.