Physical (not chemical) changes
NaCl(s) → Na+(aq) + Cl-(aq)
Added:
These are NOT chemical changes. In solid NaCl there are already Na+ and Cl- ions present in the (fully ionic)crystallic matrix. These ions are only separated by the water molecules. This is exactly what is called: 'dissolving'
This is a physical change, because the rainfall will eventually change back into water vapor. It is still has the same chemical makeup.
No. It is a physical change.
Changes of state are physical changes.
Physical change, seeing as how none of the chemical makeup of the water is changed.
Melting of a solid to a liquid, or evaporation of a liquid to a gas. The physical state is changed but it is the same substance (though some substances do breakdown under heating, then it becomes chemical)
Dissolving in water is a physical change.
Dissolving in water is a physical change.
It is a physical change.
Dissolving in water is a physical change.
Dissolving in water is a physical change.
It is a physical change.
Dissolving is a physical process.
Dissolving sugar in hot water is a chemical change.
Dissolving in water is a physical change.
Dissolving in water is a physical change.
Dissolving in water is a physical change.
Dissolving salt in water is a physical change- no chemical reaction took place. If the water evaporates, the salt is still there.