H=O=H
Because of oxygen electronegativity being significantly greater than hydrogens electronegativity. The electron shared in this covalent bond are attracted in a stronger fashion to the oxygen and this means they spend more time in the oxygen orbital and then oxygen becomes slightly more negative. By the converse the hydrogens have their two electrons spending more time in the oxygen orbital and thus are slightly positive around their poles. This polar molecule is still considered a neutral molecule over all, but hold a magnet close to water running from a faucet and see the water bend in it's course.
A zwitterion, if you mean formal charges. If you just mean relatively positive and negative, then a polar molecule.
A polar molecule such as water
A polar molecule is one that has a negative and positive end due to an uneven distribution of electron density. Water is a common example of a polar molecule, with its oxygen atom being partially negative and its hydrogen atoms being partially positive.
Surrounds the ions with the hydrogen, positive end, attracted to the negative ion ( Cl -, for instance ) and the oxygen, negative end, attracted to the positive ion ( Na +, for instance ).
Polaric molecule
The positive calcium ions in calcium chloride are attracted to the negative oxygen atom in the water molecule, while the negative chloride ions are attracted to the positive hydrogen atoms in the water molecule.
H2o
Ion-dipole attraction dictates that the negative pole of a water molecule will be attracted to the sodium cation and the positive pole of a water molecule will be attracted to the chloride anion.
Polaric molecule
A zwitterion has a formal positive charge at one end of the molecule and a negative one at the other end.
it says oxygen acts negativw so most likely hydrogen on the bottom acts positive
water is a polar solvent, it has both a negative and a positive end to it and can therefore surround both the positive and negative ions in a giant ionic lattice, this allows water to break down the solid.