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iogann1982 [59]
2 years ago
14

Water is a polar molecule, meaning the electrons that are shared between the atoms aren't shared equally so oxygen attracts more

electrons than hydrogen. What analogy best compares this?
Chemistry
1 answer:
amm18122 years ago
4 0

Answer:

Magnet with a positive and a negative pole

Explanation:

A great analogy to demonstrate what a polar molecule looks like is to imagine a magnet. A magnet has one positively charged end and one negatively charged end, two poles, that is.

Imagine that we have a magnet of a shape of a prism (water molecule has a bent shape). The two base vertices of the face of the triangle are positively charged, that's because hydrogen is less electronegative than oxygen and, hence, the two hydrogen atoms are partially positively charged in a water molecule.

Oxygen is more electronegative than hydrogen meaning it has a greater electron-withdrawing force, so electrons are closer to oxygen within the O-H bonds. Oxygen, as a result, becomes partially negatively charged, so it's our negative pole of the magnet.

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See explanation

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-)<u> True or False: All R stereocenters are dextrorotatory. </u>

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-)<u> True or False: Chiral centers in organic molecules will have 4 different groups attached to a carbon. </u>

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A chiral carbon by definition is a carbon with 4 groups. <u>TRUE</u>

-)<u> True or False: A racemic mixture has an optical activity of 0. </u>

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-)<u> True or False: Normal linear amines can be chiral centers. </u>

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In primary amines, we have 2 hydrogens. Therefore all the groups can not be different. So, is <u>TRUE</u>

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-)<u>True or False: Compound C has an optical activity of 0. </u>

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We need to know the structure of the compound

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-)<u>True or False: If the R isomer of a molecule has an optical rotation of + 25.7 degree then the S isomer of the molecule will have an optical rotation of -25.7 degree. </u>

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If we have the exact opposite (as we have in this case) the magnitud of the optical activity value will remain and the sign will change. <u>TRUE</u>

-)<u>True or False: A CN is a higher priority than a CH2OH. </u>

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In this case, a carbon is directly bonded to the chiral carbon. The carbon on CN is bonded to a nitrogen atom and the carbon on CH2OH is bonded to an oxygen. So, the CH2OH will have more priority because O has a higher atomic number. <u>FALSE</u>

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-)<u>True or False: All molecules with chiral centers are optically active. </u>

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We can have for example mesocompounds in which the optical activity is canceled out due to symmetry planes. <u>FALSE</u>

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-)<u>True or False: To have an enantiomer a molecule must have at least two chiral centers. </u>

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A pair of enantiomers is made between at least 1 chiral carbon. Enantiomer R and enantiomer S. <u>FALSE</u>

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-)<u>True or False: Chiral molecules are always optically active. </u>

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-)<u>True or False: A CH2CH2Br is higher priority than a CH2F. </u>

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<u>True or False: Diastereomers have the same physical properties except in a chiral environment. </u>

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All diastereomers have the same physical properties. <u>TRUE</u>

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<u>True or False: A C=C double bond is higher priority than a -CH(CH3)2.</u>

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