SHAPES OF MOLECULES & IONS

Video uses electron repulsion theory to explain the shapes of molecules and ions. Video is split into three main sections.
Part one deals with bonding regions only.
Part two explains the impact of lone pairs on shape and bond angle.
Part three looks at ions.
00:00 Introduction to electron repulsion theory
02:17 Two bonding regions only in the valence shell
05:07 Three bonding regions only in the valence shell
06:38 Four bonding regions only in the valence shell
09:55 Five bonding regions only in the valence shell
12:11 Six bonding regions only in the valence shell
14:39 Impact of lone pairs on shapes and angles
24:17 Shapes on ions
26:41 What to include in any shapes answer
Link to Machemguy website sites.google.com/view/mackemguy/

[@thriller2789]

This summarizes basically everything, and is very helpful

[@user-ub7se2qt6t]

Absolutely helpful , god bless you for saving me

[@ZaynMohammed-fi8qp]

thank you so much you made the whole thing seem so simple :)

[@mikeywinstone8525]

Thanks for this video sir. Very helpful

[@raymondwilson2933]

Excellent video. Might be useful to mention octet expansion for PCl5 and SF6

[@MaChemGuy]

Thanks - I cover that in my covalent bonding videos earlier on in the topic. In hindsight, wish I'd made a quick reference to it though

[@rosaalnds]

hi in the textbook it shows a 109.5 angle between the dotted wedge of H and the bold wedge of H in methane and not between C and H. would either be right ?

[@MaChemGuy]

All the angles are the same in a tetrahedral arrangement

[@galaxyswrld9414]

Sir how would you know that the hydrogens are in the flat plane and that the lone pairs are in the above and lower planes, instead of vice versa? 21:36

[@MaChemGuy]

I just chose those positions to make it easier to visualise

[@fromjessica3009]

Hi Sir, in other resources it says the bond angle of SO2 is 120 degrees no 117.5 degrees. I'm quite confused about this

[@MaChemGuy]

Hi there. As I’m sure you know, SO2 has 3 electron regions in the valence shell, 2 bonding regions (both double bonds) and 1 lone pair. The OCR specification allows treating multiple bones to be equivalent to single bonds in terms of repulsion which is where the 117.5 degrees comes from (120-2.5 from the extra repulsion from the lone pair) I’ve looked online and have seen that this is not strictly true due to extra repulsion from double bonds. I’ve seen angles of 120 and 119 from different sources. For the purposes of A level which is often simplified I’d still advise giving an angle of 117.5. Hope that helps.

[@engineeringmadeasy]

@@MaChemGuy Reading your reply saved my time.

[@user-kx6sl2sr7u]

Are you expected to know where it is double bonded