AS OCR chemistry B (SALTERS) F331 on the 15th may 2012

Reply 120

AGrumpyMole

11

Were the 2 functional groups alkene and alcohol?

Reply 121

megank

5

Original post by dekg140

Damnit I made a stupid mistake, what did you guys put for the sulfurhexafluoride shape and bond angle? i put octahedral and 90 degrees but realise now it should have been 180 degrees as it said bond angle between F-S-F

OMG... cuz i put octahedral too.. i thought its right :/ ??

Reply 122

xxZazxx

well it was alright i spose, i stupidly did the full structural formula instead of the skeletal when we had to draw the isomers :frown:

so that's 2 marks gone, and i didnt get that question about the m/z 181 peak thing, i jst wrote some rubbish for that. hopefully scraped an A but maybe a B more realistically

Reply 123

Mangodepo11

8

Original post by dekg140

Damnit I made a stupid mistake, what did you guys put for the sulfurhexafluoride shape and bond angle? i put octahedral and 90 degrees but realise now it should have been 180 degrees as it said bond angle between F-S-F

Everyone who came out put 90 degrees. But i saw the f-s-f But that meant it was asking us to two things right?

Reply 124

AGrumpyMole

11

Original post by dekg140

Damnit I made a stupid mistake, what did you guys put for the sulfurhexafluoride shape and bond angle? i put octahedral and 90 degrees but realise now it should have been 180 degrees as it said bond angle between F-S-F

i put octahedral and 109 because SF6 is octahedral but F-S-F has so lone pairs and 2 bonding paris...

Reply 125

xxZazxx

Original post by megank

OMG... cuz i put octahedral too.. i thought its right :/ ??

Nooooo i put octahedral too :frown:

Reply 126

pkg995

Original post by Reina

Yay! Me too! :biggrin:

Though I think I wrote down COH3....for some silly reason :/

Hopefully it won't matter :P

I did the same I don't think it'll matter though because its still the same ratio.

Reply 127

megank

5

what did everyone draw for methylbutane??

Reply 128

dekg140

9

octahedral is correct, just not 90 degrees i think :/

Reply 129

megank

5

Original post by AGrumpyMole

i put octahedral and 109 because SF6 is octahedral but F-S-F has so lone pairs and 2 bonding paris...

ouch... thats a good point :/

Reply 130

Salmonidae

1

Surely it is 90 degrees, F-S-F could be F to S to any F which could be 90 or 180. Other than that (and the states As+Ga question) pretty good exam in my opinion.

Reply 131

*mike

Original post by megank

Yes!!

hoping i can get a high A in here so i wont need as many marks in the paper next wednesday to get an overall A :tongue:

Same, F332 is so much harder than F331 in my opinion

Reply 132

Mangodepo11

8

Original post by megank

ouch... thats a good point :/

If his point is valid

1. Octehedral
2.109
3.repulsion
4.far as possible

Right?

Reply 133

pkg995

Original post by AGrumpyMole

i put octahedral and 109 because SF6 is octahedral but F-S-F has so lone pairs and 2 bonding paris...

I think it was 109. It had two lone pairs but I put tetrahedral for the shape.

Reply 134

megank

5

Original post by Richyp22

If his point is valid

1. Octehedral
2.109
3.repulsion
4.far as possible

Right?

yeah i think that should be right :/ but i wrote 90 degrees instead :frown:

urgh stupid thing.. but i still wrote electrons repel to minimise electronic repulsion and octahedral so hopefully i still get some marks :/

Reply 135

Salmonidae

1

Original post by pkg995

I think it was 109. It had two lone pairs but I put tetrahedral for the shape.

No no no no surely it was Octahedral, the sulphur atom had 6 electron dense areas. All the F-S-F was asking you was for one bond angle, which is 90 degrees. Stop looking into it so deeply! :tongue:

See below

(edited 11 years ago)

Reply 136

megank

5

Original post by Salmonidae

No no no no surely it was Octahedral, the sulphur atom had 6 electron dense areas. All the F-S-F was asking you was for one bond angle, which is 90 degrees. Stop looking into it so deeply! :tongue:

Yeah thats what im hoping :smile:

but that was a confusing question... :/

Reply 137

craycray

http://en.wikipedia.org/wiki/Sulfur_hexafluoride

It'd either be 90 or 180 degrees, no? Already lost quite abit of marks, super bummed :frown:

What did anyone put for the catalyst letters one?

Reply 138

:)ella

15

Original post by Richyp22

If his point is valid

1. Octehedral
2.109
3.repulsion
4.far as possible

Right?

If there are 6 F atoms around the S then surely it's 90?

Reply 139

holly90210

Original post by Salmonidae

No no no no surely it was Octahedral, the sulphur atom had 6 electron dense areas. All the F-S-F was asking you was for one bond angle, which is 90 degrees. Stop looking into it so deeply! :tongue:

yeah but it has 2 lone pairs of electron and was surrounded by 4 areas of electron density (2 lone pairs and 2 bonding pairs of electrons) so the bond angle is 109.. or 105 if you're being really precise

AS OCR chemistry B (SALTERS) F331 on the 15th may 2012

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