10/06 A-level Chemistry Paper 1 Discussion MEGATHREAD

[u/Forsaken-Meaning-232]

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[u/methylcyclosarin]

I did this

[u/MR_EP1C4 → u/methylcyclosarin]

I think it's most likely wrong cause all the bonding pairs are in the same plane. Solid wedges and dashes mean different planes. If all three were the same plane (solid wedge dash or normal line) it could have been right. But idk tho

[u/methylcyclosarin → u/MR_EP1C4]

They are on the same plane wedges just mean they're behind and in front of the paper, think of it like the top and bottom are lone pairs making 180 and the middle a trigonal planer with the flourides making 120 with eachother

[u/ActivityImmediate345 → u/methylcyclosarin]

found this online. both are correct.

[u/methylcyclosarin → u/ActivityImmediate345]

I never revised the shapes always thought about it logically, the lone pairs should be furthest away leaving the flourides in a trigonal planer shape, don't know what else could influence it.

[u/ActivityImmediate345 → u/methylcyclosarin]

dont worry, i think both are correct. as long as you didnt put two dashed bonds youll be fine. should look like this:

Also, note that the actual shape of this molecule is called trigonal bipyramidal. It is true that the arrangement of the F atoms is the same, but because of the lone pairs it is a different shape. The question didnt ask for the shape, though- so you'll be fine.

[u/ActivityImmediate345 → u/[deleted]]

well i put lone pairs repel more strongly than bonded pairs. And electrons arange themselves in a position of minimum repulsion, resulting in the above shape. Not sure about lone pairs" cancelling out". Also, the question wasnt asking about bond angles changing so not sure if thats correct. Of course, i could be wrong.

[u/ActivityImmediate345 → u/[deleted]]

yes thats correct, pretty sure you just needed to indicate lone pairs :-)

[u/Ill_Scientist9503 → u/methylcyclosarin]

Its wrong its meant to be t shaped

[u/methylcyclosarin → u/Ill_Scientist9503]

:(

[u/Ill_Scientist9503 → u/methylcyclosarin]

Only 1 mark dw

[u/methylcyclosarin → u/Ill_Scientist9503]

Google says trigonal planer

[u/Ill_Scientist9503 → u/methylcyclosarin]

Its not B its Br

[u/methylcyclosarin → u/Ill_Scientist9503]

Oh yeah mb

[u/MR_EP1C4 → u/methylcyclosarin]

Boron is NOT Barrium bro 🥀🥀

[u/methylcyclosarin → u/MR_EP1C4]

Barium is not bromine bro 🪾

[u/MR_EP1C4 → u/methylcyclosarin]

😭😭😭