Which of the following is a example of a irriversible change.

Question

Which of the following is a example of a irriversible change.

a)Disssolve salt in water
b)Freezing water
C)Mixing water-colour

Which do you think you can't separate? Can you separate salt after it is dissolved in water? I think I could evaporate the water and leave the salt behind.
Can water be melted after it is frozen?
Can water and a soluble dye be separated? Think of dyeing Easter eggs. Can you put the dry dye back into the box?

Answer 1

An example of an irreversible change is c) Mixing water-color. Once water and a soluble dye, such as water-color, are mixed together, it is not possible to separate them and obtain the original water and dye components. Unlike dissolving salt in water, which can be separated by evaporation, or freezing water, which can be melted back into liquid form, the mixing of water-color results in a permanent change where the water and dye cannot be easily separated. The dye becomes permanently absorbed or dispersed in the water, making it irreversible.