BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Because they tend to be have low freezing points.
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Because they have the same charges at each end, like the north and south pole of a magnet.
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Because they have opposite charges on each, like the north and south pole of a magnet.
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Detailed explanation-1: -A polar molecule is a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative. The two electrically charged regions on either end of the molecule are called poles, similar to a magnet having a north and a south pole. Hence, a molecule with two poles is called a dipole.
Detailed explanation-2: -Some molecules have positive and negative ends too, and when they do, we call them polar. If they don’t, we call them non-polar. Things that are polar can attract and repel each other (opposite charges attract, alike charges repel). The two magnets in the image above will attract because their opposite poles are near.
Detailed explanation-3: -The unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule means that a water molecule has two poles-a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side). We say that the water molecule is electrically polar.
Detailed explanation-4: -The more strongly an atom attracts the electrons in its bonds, the larger its electronegativity. Electrons in a polar covalent bond are shifted toward the more electronegative atom; thus, the more electronegative atom is the one with the partial negative charge.
Detailed explanation-5: -Answer and Explanation: The opposite ends of a polar molecule have opposite charges. In a polar molecule electrons are shared unequally over the covalent bond. The more electronegative atom pulls the electrons closer to it, giving it a partial negative charge.