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A molecule that has a different regions or poles that have different charges is known as polar. Polarity occurs because oxygen is more attractive to electrons than many other atoms to include hydrogen. Electrons in a water molecule spend more time near the nucleus of the oxygen atom than it spends near the nuclei of a hydrogen atom, this is called electronegative. When there is a negatively charged electron near the oxygen in water it carries a negative charge. A nonpolar molecule is an atom that carries no partial charge. For example, the carbon-hydrogen bonds share electrons equally, and they are nonpolar.

Belk, C. M., & Maier, V. B. (2016). Biology: science for life with physiology.Links, 1, 1-6.
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