Which of the following example demonstrates the reversibility of a chemical change?
refreezing carbon dioxide gas into dry ice
the rotting of eggs
recharging batteries
dehydrating sugar water
refreezing carbon dioxide gas into dry ice
The example that demonstrates the reversibility of a chemical change is "refreezing carbon dioxide gas into dry ice."
The example that demonstrates the reversibility of a chemical change is refreezing carbon dioxide gas into dry ice.
To understand why this is the correct choice, we need to consider the definition of reversibility in the context of chemical changes. A reversible chemical change is a process in which the reactants can be converted back into the original products under suitable conditions.
In this case, when carbon dioxide gas is cooled and pressurized, it can be converted back into a solid form known as dry ice. This process is reversible because the solid dry ice can be heated, causing it to change back into carbon dioxide gas.
On the other hand, the other examples mentioned do not demonstrate the reversibility of a chemical change. The rotting of eggs is a decomposition process that cannot be undone by reversing the conditions. Once the eggs start to rot, they cannot be converted back into their original form.
Similarly, recharging batteries involves a chemical reaction that converts stored chemical energy into electrical energy. While the batteries can be recharged and reused, this process does not reverse the original chemical reaction that occurred during the discharge of the battery.
Finally, dehydrating sugar water involves removing water from a solution, resulting in the solidification of sugar. This process is irreversible because the water molecules that were removed cannot be easily reintroduced into the solid sugar to convert it back into a solution.
Therefore, refreezing carbon dioxide gas into dry ice is the example that demonstrates the reversibility of a chemical change.