Electronegativity & Bond Polarity | A-level Chemistry | OCR, AQA, Edexcel

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[@the24th28]

This is a little late but for anyone stuck on the last question it is because of this: Linear, trigonal planar and tetrahedral shapes are symmetrical if all the atoms bonded with the central atom are the same. In this case, it isn't because we have chlorine and hydrogen so despite it having a tetrahedral shape it is unsymmetrical and thus is a polar molecule.

[@ren23030]

That's what she said tho

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[@sarahmallon2426]

Is magnesium iodide not ionic ?

[@saratariq4363]

Why arent there any partial charges on hydrogen. 15:14

[@NEUROSHOCK123Channel]

I think it's because the charge is greater between the carbon and chlorine than the hydrogen and carbon so you just leave that partial charge out??

[@DH-vr4lw]

15:01 she says that carbon has an overall slightly positive charge because chlorine is more electronegative so it attracts the electrons, however carbon is more electronegative than hydrogen, therefore it attracts the electrons from both Covalent bonds with hydrogen, how does that give it an overall positive charge if it’s more electronegative than hydrogen and attracts its electrons?

[@houseflyer4014]

in this case carbon and hydrogen are both slightly positive because the chlorine is the most electronegative atom in the structure. if you're asked a question like this, if a hydrogen is next to another slightly positive atom, then the dipoles of that bond cancels out so hydrogen isn't taken into account.

[@anoopmanakkalath]

In-silico calculations show that the negative charges are located on C atom in CH2Cl2. The positive charges are located on H. The Cl atoms are almost zero (+0).

[@norhansaifelnasr6087]

in question 2, why did she consider that electrons are shared in MgI2? Isnt it an ionic compound?

[@ren23030]

That's what I thought

[@tamaraleslie8422]

It’s definitely ionic she probably made a mistake

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[@ethanlin9237]

How do you know what shape the molecule is tho - do you have to learn them by heart? e.g. at 13:13

[@ReeganDalli]

I do aqa and we are expected to learn how to calculate molecular shapes

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[@kidsgalaxy6958]

What EN and bond polarity are same topics? plz fast rply okk

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do we get pauling scale in exams?

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[@no-handlleee]

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[@l_m_a_o2178]

8:54 I think you drew the arrow wrong for the polar bond cause according to the textbook the bond is closer to hydrogen not chlorine

[@florent8098]

It's closer to chlorine because there is more protons in chlorine than hydrogen which means in chlorine, the pull towards the nucleus is greater than hydrogen, so they are attracted to chlorine more. I hope my explaination helped you understand. :D

[@l_m_a_o2178]

@@florent8098 OhhhHHH that makes so much sense thanks :-)

[@MrTheObviousCaptain]

isnt ch2cl2 symmetrical?

[@3rdVisionProject]

Thats exactly what I thought. Have you found out why it's unsymmetrical yet? If so, please share :)

[@3rdVisionProject]

Never mind. "since chlorine pulls the dipoles more than hydrogen, so not all tetrahedral shapes are non polar". So I'm assuming that tetrahedral is only symmetrical when the whole molecule has the same charges?

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[@jamesvellavidal8381]

Hopefully someone answers before my text.. She mentions in her notes that a tetrahedral shape makes it non polar... In the uestion of ch2cl2 she says the molecule is polar because it is a tetrahedral shape.... WHAT??!!

[@raquelbozzo1102]

No, she said that ch2cl2 is a polar molecular because their structur is not symetrical, so the dipoles do not cancel each other out

[@archjanasivasuthan6252]

@@raquelbozzo1102 Hey doesn't the tetrahedral shape make a molecule non-polar, because it is a symmetrical molecule?

[@raquelbozzo1102]

@@archjanasivasuthan6252 heyy, yes but as u can see in her draw, that the molecules, Cl, pull the dipole for them, not canceling each other out, creates a dipole moment. (sorry for my bad english)

[@jamesvellavidal8381]

@@raquelbozzo1102 thanks, undersood now, since chlorine pulls the dipoles more than hydrogen, so not all tetrahedral shapes are non polar

[@round3706]

@@jamesvellavidal8381Vidal so is tetrahedral only symmetrical when the atoms surrounding the central atom are identical?

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