Explain why ionic substances dissolve in water.Like an explanation why they dissolve in water and what causes it to dissolve in water like the...

Because of the structure of water, it is a polar molecule.
That means that the hydrogen atoms have a slightly positive charge, and the oxygen atom
has a slightly negative charge.

Ionic compounds are
crystals with equal numbers of positive and negative ions. When these ionic compounds
are put in water the water molecules start to attract the ions, separating them from
each other. The hydrogen atoms of the water molecules are closest to the negative ions
of the compound, and the oxygen atoms of the water are closest to the positive ions of
the ionic compound.

Picture each of the ions of the ionic
compound being surrounded by water molecules and that will give you an idea of what is
happening, but at a very fast rate once the compound is added to
water.

This is just a physical change since if the water is
removed the ionic compound is recovered unchanged.