This very common phenomenon occur when the electronegativities of the two elements are not equal.
I believe you are referring two the attraction between two polar molecules? If that is the case then the answer is dipole-dipole force.
polar
A chemical bond with unequal sharing of electrons is called a covalent bond. This results to a slightly negative charge on one end and a slightly positive charge on the other end.
A polar bond occur when electrons are shared unequally. However, POLAR MOLECULES are the ones that have a slight postitive charge on one end and a slight negative charge on the other end.
A molecule that has a negative and positive end is a polar molecule.
The C-F bonds in CF4 are single covalent bonds with a slight negative charge at the F end and a slight positive charge at the C end. The central carbon forms one bond with each fluorine.
A zwitterion has a formal positive charge at one end of the molecule and a negative one at the other end.
A polar covalent bond consists of a positive and negative end.
A bond with negative end and a positive end
This is a hydrogen bond.
Positive end to positive end = repel Negative end to negative end = repel Negative end to positive end = attract
A chemical bond with unequal sharing of electrons is called a covalent bond. This results to a slightly negative charge on one end and a slightly positive charge on the other end.
The positive end of a battery goes to the positive end of the terminal. In retro spec, the negative end of a battery goes to the negative end of the terminal.
A polar covalent bond and this unequal sharing of electrons gives one end a slight negative charge and the other end a slight positive charge, though the molecule is neutral in charge.
Why do electrons move the negative end of the tube to the positive end
Electrons have a negative charge and are attracted by the positive end.
Electrons have a negative charge and are attracted by the positive end.
A polar covalent bond. Slightly positive on one end and slightly negative on the other, but overall a neutral molecule.
Because opposite charges attract. The negative end of the dipole moment is trying to get to the positive end of the field, and the positive end of the dipole is trying to get to the negative end of the field.