The example that demonstrates the reversibility of a chemical change is recharging batteries. Recharging batteries involves a reversible chemical reaction where the products can be converted back into the reactants through an external electrical energy input, allowing the battery to be used multiple times.
The other options represent changes that are typically not reversible in a chemical sense:
- Refreezing carbon dioxide gas into dry ice is a physical change.
- Dehydrating sugar water involves removing water, which can be reversed by adding water back, but the chemical makeup of the sugar remains unchanged.
- The rotting of eggs is a chemical change that is not reversible.
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