Why is carbon dioxide a non-polar molecule while water is a polar molecule?
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Answer:
Carbon dioxide is a non-polar molecule because carbon and oxygen have similar electronegativities (Carbon is 2.55 and Oxygen is 3.44). Because of this, there is no movement of electron density (or dipole moment) in one direction or the other to create polarity. Some may also point out that the molecular arrangement itself ( O = C = O ) causes an equal pulling of electrons.
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Other answers
The arrangement of atoms in some molecules is that one end of the molecule has a positive electrical charge and the other has a negative charge. In this case, the molecule is called a polar molecule, meaning that it has electrical poles. Otherwise, it is called a non-polar molecule. Whether molecules are polar or non-polar determines if they will mix to form a solution.
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