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OCR B (Salters) F332 Tuesday 4th June 2013 Exam Discussion (Now Closed)

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Reply 1060

tigerz

Original post by abzy1234

We shall see! And ditto, got the same as well :biggrin:

You worked out the oxidation state of nitrogen in that ion in the earlier part when it was talking about oxidation, and there's two oxygen atoms, so you know it's going to end in ate... Systematic means you need to put in the oxidation state of the central atom in brackets.

It's like the chlorate section in the AS revision guide :smile:

Awesome lool, yeah I just messed up thought it was n20 NOT no2 but still put (iii) in
Oh wells :smile:

Reply 1061

Elliot.kai.lee

Original post by Waki

What about the atom economy question?

100% it said in the question all products were useful, plus it was electrolysis..

Reply 1062

super121

Original post by tipani

I i have to admit, i didn't this exam easy at all, but from past experience, there wasn't any particularly hard questions apart from the question at the end which was quite querky.

I reckon atleast 83 for the A, and may be up to 85. Remember they usually have to cap the percentage of people who achieve A's and i know a lot of people who seem like they got close to 100, or atleast 95.

No, really don't think it's gonna be that high. A few question caught some people out and i'm sure lots more marks were lost due to silly mistakes. Also, we only make up a small minority of the people that took this exam

Reply 1063

abzy1234

Original post by krisshP

If it's in F335 A2, why were we asked this question? It's not in the F332 spec, so it's an illegal question by evil OCR salters.

Lol not really, it's a recap topic in F335. You had to work it out using oxidation states, which is a topic discussed in pages 40-41 in the AS revision guide :smile:

Reply 1064

nukethemaly

Original post by Tejmasta

the answer was all in the prerelease text. all you had to do was basically copy out what it said

that's quite literally what I did, and the entire time I was thinking "come on it can't be this eaaaasy"

Reply 1065

Elliot.kai.lee

Original post by steviep14

That is correct if you phrased it correctly... that's the reason C-F is more polar :smile:

Previous question identical to this one state in the MS that you need " C-F bond is shorter bond length " for the 3rd mark.. sneaky one :wink:

Reply 1066

booooomblastruin

Original post by Tejmasta

no, nitrogen is the central atom so there is a triple bond between it and the other nitrogen and a dative bond with the oxygen (both electrons from nitrogen) giving it a linear shape

Oh fooey

I see now. Fig 2. right? Sorry about that :smile:

Reply 1067

juniorx

Original post by abzy1234

Lol not really, it's a recap topic in F335. You had to work it out using oxidation states, which is a topic discussed in pages 40-41 in the AS revision guide :smile:

i haven't even done f335 yet. this is supposed to be an as exam!!! and which revision guide are you talking about???

(edited 10 years ago)

Reply 1068

abzy1234

Original post by MintCrepz

Yeah yeah that's how I knew it was III but I thought only NO3 was nitrate nothing else, whoops.

Original post by tigerz

Awesome lool, yeah I just messed up thought it was n20 NOT no2 but still put (iii) in
Oh wells :smile:

It's so easy to get muddled up with Nitrogen and its many relatives :smile:

Wait until you get to F335 though, and then nitrogen chemistry really kicks in :tongue:

Reply 1069

krisshP

Original post by juniorx

i did 71/ the mr of the reactants then multiplied by 100

It said ALL products are useful so 100% atom economy. It was a 1 mark question, so it should require zero working out anyway.

Reply 1070

Davelittle

For the the 6 marker did anyone else notice that it said what happens when the radiation from the sun enters the TROPOSPHERE?

I wrote the IR from the sun is absorbed by the bonds in the greenhouse gas molecules and the uv/visible reaches the ground where it warms the earth... I basically did the whole greenhouse effect explanation twice, once for the IR from the sun and once for the IR from the earth :smile:

Reply 1071

cyberphilic_9999

so nitrite is correct right? http://en.wikipedia.org/wiki/Nitrite first line, can't believe i guessed that!!!!!!!!!!!

Reply 1072

tigerz

Original post by abzy1234

It's so easy to get muddled up with Nitrogen and its many relatives :smile:

Wait until you get to F335 though, and then nitrogen chemistry really kicks in :tongue:

>.< Dreading that haha!
Oh well I haven't made too many silly mistakes which is a relief, I messed up f331 because of silly mistakes haha

Reply 1073

Baymmm

what did people put for the question that asked about the type of bond breaking or something? I couldn't work out if it was asking for photodissociation or homolytic bond fission, so put photodissociation causes homolytic bond fission

Reply 1074

super121

Original post by Davelittle

Yea, I included that as well

Reply 1075

Davelittle

Original post by super121

I don't think they can make the boundary higher than 80% raw marks anyway can they?

Reply 1076

juniorx

Original post by krisshP

It said ALL products are useful so 100% atom economy. It was a 1 mark question, so it should require zero working out anyway.

i know i thought it was strange how they only gave one line. The ****ing thing though is i knew that they were alll useful products but i still thought they were specifically on about the chlorine :angry: