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mixing cement with water is a irreversible change
reversible
Rusting is a irreversible change although you can get products which can get rid of it.
Portland cement (and the concrete, mortar, thin set, or other masonry product made from it) doesn't dry. Rather, it cures by a chemical reaction initiated by putting water in it. The reaction is irreversible; hence, adding water to cement is an irreversible change.
It isn't easily reversible but, it is reversible. You can use a molecular sieve or a distillation column to separate them.
mixing cement with water is a irreversible change
Irreversible
reversible
no
Sugar and Salt
It is reversible. You can allow the water to evaporate, leaving the salt behind.
Rusting is a irreversible change although you can get products which can get rid of it.
Portland cement (and the concrete, mortar, thin set, or other masonry product made from it) doesn't dry. Rather, it cures by a chemical reaction initiated by putting water in it. The reaction is irreversible; hence, adding water to cement is an irreversible change.
No because you can't get the vinegar back to it's original state because some of the bacteria has gone inside the milk
It isn't easily reversible but, it is reversible. You can use a molecular sieve or a distillation column to separate them.
Yes it is. Once mixed it can never be altered or undone
The process of coffee cooling down and giving up heat to the environment is irreversible since the available heat in the environment will never re-heat the coffee. I believe the process of mixing coffee grinds with hot water is also irreversible. Theoretically it would be possible but i think you would have to do work on the system to separate the two which would make it irreversible.