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Shapes of Molecules QUESTIONS!

Describe the structure and bond angle in C2H3Cl

I don't know how to work this out!

anyone got any ideas?
i think the bond angles around each carbon are 107.5 and based on tetrahedral...but im not 100% sure
(edited 13 years ago)
Reply 2
Avatar for Scapepicture
Scapepicture
OP
8
it has a bond angle of 120 but i don't know why.
i think it's an alkene, where the 2 C are double bonded to each other and 2 H on 1 C & 1 H and 1 Cl on other C
Original post by Scapepicture
it has a bond angle of 120 but i don't know why.


ah yes, my bad, its a trigonal planar molcule because it has a double bond, so each carbon is bonded to essentially 3 other atoms (count the C=C double bond as one bond)

so 3 bonds = trigonal planar = bond angle of 120
Reply 5
Avatar for eswnl
eswnl
C2H3CL is Chloroethene. Its got a double bond between the carbon atoms.

I can see why its 120 degrees between each bond because the carbon atom has one double bond and 2 single bonds coming off it. Therfore for maximum seperation - 120.
Reply 6
Avatar for nazirard
nazirard
Original post by Scapepicture
Describe the structure and bond angle in C2H3Cl

I don't know how to work this out!

anyone got any ideas?


It looks like this:
.....

.....h..h
.....!...!
.....c=c
.....!...!
.....h...cl

This is better:



Each Carbon is in the chape of a trigonal planar and has a bond angle of 120 degrees. Now can you see?
Always draw them out first.
Reply 7
Avatar for nazirard
nazirard
Original post by viksta1000
ah yes, my bad, its a trigonal planar molcule because it has a double bond, so each carbon is bonded to essentially 3 other atoms (count the C=C double bond as one bond)

so 3 bonds = trigonal planar = bond angle of 120


This could be misleading when it comes to lone pairs of electrons.
Reply 8
Avatar for user152713
user152713
it's 107, pyramidal around the carbon atoms fullstop.
Reply 9
Avatar for nazirard
nazirard
Original post by Rassam
it's 107, pyramidal around the carbon atoms fullstop.


No it's not.
Reply 10
Avatar for user152713
user152713
Original post by nazirard
No it's not.


My bad, Carbon has 4 not 5 electrons, so it would be slightly smaller than a triganol planar shape so about 119.
Reply 11
Avatar for JayEm
JayEm
14
Original post by Rassam
My bad, Carbon has 4 not 5 electrons, so it would be slightly smaller than a triganol planar shape so about 119.


A neutral carbon atom has 6 electrons.

/pedantry :colondollar:
Reply 12
Avatar for nazirard
nazirard
Original post by Rassam
My bad, Carbon has 4 not 5 electrons, so it would be slightly smaller than a triganol planar shape so about 119.


Having 4 bonds and no lone pairs would make it 107 degrees not 119.
Because of the double bond with the neighbouring carbon atom you get "3 bonds" if you must in the carbon atoms. Thus the bond angle around each carbon atom is 120 degrees so it must be a trigonal planar.
Reply 13
Avatar for nazirard
nazirard
Original post by JayEm
A neutral carbon atom has 6 electrons.

/pedant :colondollar:


Carbon has 4 electrons on it's outer shell.
Reply 14
Avatar for JayEm
JayEm
14
Original post by nazirard
Carbon has 4 electrons on it's outer shell.


Yes that's correct but that's not what I said.
Reply 15
Avatar for nazirard
nazirard
Original post by JayEm
Yes that's correct but that's not what I said.


Correct. Apologies.:smile:
Reply 16
Avatar for user152713
user152713
Original post by JayEm
A neutral carbon atom has 6 electrons.

/pedantry :colondollar:


6? thats not what my periodic table says...
Reply 17
Avatar for nazirard
nazirard
Original post by Rassam
6? thats not what my periodic table says...


In total.
Reply 18
Avatar for JayEm
JayEm
14
Original post by Rassam
6? thats not what my periodic table says...


:facepalm:

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