Question

Which of the following examples demonstrates the reversibility of a chemical change? Refreezing carbon dioxide gas into dry ice. Recharging batteries. The rotting of eggs. Dehydrating sugar water.

Answer 1

The example that demonstrates the reversibility of a chemical change is "refreezing carbon dioxide gas into dry ice." This process is physical; the change from gas to solid (dry ice) and back to gas is reversible and does not involve a change in chemical composition.

On the other hand:

- Recharging batteries involves a chemical change that can be reversed, but it is a process that involves energy conversion.
- The rotting of eggs is a chemical change that is not reversible.
- Dehydrating sugar water is also a physical change (removing water) that is reversible, but it does not classify as a chemical change.

So, the best answer related to the reversibility of a chemical change in the context provided is refreezing carbon dioxide gas into dry ice, emphasizing the physical nature of that process.