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How are polar and nonpolar bonds alike?

Chemistry Polar/Nonpolar Bonds?

  • Hey guys, i have a CHEMISTRY test tomorrow and i can't really understand the polar/non polar bonding section! can someone please explain the difference between them, and how to ...show more

  • Answer:

    Okay first step in understanding polarity is to know that Fluorine is the most electronegative atom (3.98 or so). And the greater the difference between the atoms means the greater electronegative. Lets begin, since you know that Fluorine is the most electronegative lets start with that: If you look at the difference in electronegative of Fluorine and Silicon you will see that its quite a lot so that makes it the most polar. And also, in order for it to be polar, the difference has to be above 1.5 or so (cant remember the exact value). But generally, if you move farther from Fluorine you will see the electronegativity decreases and as you move close to it it will start getting higher. Hope this helped! Check the electronegative chart out. It will make more sense.

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If the molecule is SYMMETRICAL (e.g. methane) it will be NON-polar. This is because the hydrogen atoms are at each end of the molecule (see picture). The negative carbon centre is covered by positive hydrogen ends. If the molecule is NOT SYMMETRICAL (e.g. water, hydrogen chloride, hydrogen flouride) there will be a polar charge because one side is more positive and the other is more negation (see the Negatives chart in your data booklet to determine the more negative). H--F H--Cl

H

Look up the electronegativity of each atom in the bond and subtract. The larger the difference, the more polar. (And at about 1.7 difference, the bond is more ionic than covalent.) You can also take a good guess by seeing how far apart the atoms are from each other on the chart.

Chris

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