Question

The statement given below is incorrect. Write the correct statements.

A chemical change can be easily reversed.

Answer 1

Chemical change: It is a type of change in which there is a change in the substance's chemical properties and a new substance is formed.

• It is a type of irreversible change
• Irreversible change: It is a type of change that cannot be reversed.
• Heat will be released or absorbed in this type of reaction.
• For example, Magnesium(Mg) when reacted with oxygen(O₂) results in the production of magnesium oxide(MgO), and energy is released in the form of light.
• $\underset{\mathrm{Magnesium}}{\mathrm{Mg}\left(\mathrm{s}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Magnesium}\mathrm{Oxide}}{\mathrm{MgO}\left(\mathrm{s}\right)}+\mathrm{light}$

Physical change: It is a type of change in which there is no change in the substance's chemical properties and no new substance is formed.

• It is a type of reversible change
• Reversible change: It is a type of change that can be reversed easily and completely.
• For example, Melting of ice, freezing of water, etc.
• Therefore a physical change can be reversed but not a chemical change

Correct statement: A physical change can be easily reversed.