polar vs nonpolar
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polar vs nonpolar
What does the minimum numerical difference in electronegativity have to be for a molecule to be considered polar?
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Re: polar vs nonpolar
Beyond being given the specific electronegativity an easy way I find that generally works for finding out if a molecule is polar or nonpolar is to draw out the lewis structure, specifically with shape in mind (ie including bends due to lone paired electrons). If the molecule is perfectly symmetrical in all ways, than it is most likely nonpolar.
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Re: polar vs nonpolar
Shape definitely is important to determining whether or not a compound is polar or not. However, for this midterm shape is not covered. As a shorthand rule remember that if a compound is between a element on the far right and the far left it is most likely ionic in nature. If they are closer together it is most likely less ionic and more covalent. Electronegativity follows ionization energy trends.
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Re: polar vs nonpolar
Yes I agree with Shamaya, the lower limit for a polar covalent bond is 0.5. The upper limit is around 1.6 or 1.7, and if the electronegativity difference is more than 2 it's considered to be an ionic bond!
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Re: polar vs nonpolar
Hi! For it to be considered polar I believe it needs to be above the .5 threshold
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Re: polar vs nonpolar
The lower threshold is .5 for a polar covalent bond! The lewis structure is great for indicating whether it's polar or nonpolar if the shape is symmetrical; in that case, the compound is most likely nonpolar.
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Re: polar vs nonpolar
In class he said that if the difference is greater than 2 it is considered ionic and if the difference is less than 1.5 it is considered covalent.
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Re: polar vs nonpolar
I think the electronegativity difference has to be higher than or equal to 0.5 and lower than 1.6 for a bond to be considered polar.
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Re: polar vs nonpolar
In order to be polar I believe the electronegativity needs to be between the 0.5 and 1.6 threshold. If it’s over this threshold it is ionic :~)
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Re: polar vs nonpolar
The difference in electronegativity needs to be between 0.5 and 1.6 to be considered polar!
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Re: polar vs nonpolar
In most books, if the polarity difference is about 0.5 or more then it is said to be polar.
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Re: polar vs nonpolar
From what I read, the electronegativity difference has to be between 0.5 and 1.6 to be considered polar. Anything less than 0.5 is non-polar!
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Re: polar vs nonpolar
I've seen some exceptions to this rule, but in general 0.5 to 1.6 is the case to be polar!
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Re: polar vs nonpolar
Hi! I believe that the minimum numerical difference in electronegativity in order for a molecule to be considered polar is 1.6 less. Also, if the difference in electronegativity is less than .05, the molecule is usually considered non polar.
Re: polar vs nonpolar
I searched it up because I too was unsure about the minimum difference that classifies a molecule as polar. I found that most sources supported everyone else's answer that it must be greater than 0.5.
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Re: polar vs nonpolar
Hi! I learn this not in the lecture( I am not sure if he talked about this but) when the difference in electro negativity is larger than .5, then it is consider as a polar bond. In most cases only same element bond are not polar ( ex: H2,O2)
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Re: polar vs nonpolar
In order for it to be polar, the electromagnativity difference must be in between .5 and 1.6.
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Re: polar vs nonpolar
For a molecule to be polar, the difference in electronegativity between atoms must be greater than 0.5
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Re: polar vs nonpolar
In general, minimum difference in polarity must be about 0.5. This is because anything below this number is not as significant in making the electron distribution greater on one side than another.
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Re: polar vs nonpolar
I think the number is 0.5, but you can also look at the shape and the symmetry to determine if it is polar or nonpolar as well.
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