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A polar covalent bond is a covalent bond in which the electrons are not shared equally between the atoms. This results in a partial positive charge on one atom and a partial negative charge on the other atom. The polarity of a bond is determined by the difference in electronegativity between the two atoms. A polar covalent bond can be identified by the presence of a dipole moment, which is a measure of the separation of the positive and negative charges. Polar covalent bonds are common in many molecules, such as water and ammonia.