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Chemistry Salters F332 june 2010

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i was really confused with that nitrogen question. put my hand up and asked 2 teachers both of whom were obviously no help at all :confused:

it said how much more (%) nitrogen did venus have compared to earth which i think must have been worded incorrectly as earth has more than venus. Had no clue wat calculation to do and so just wrote
"earth has more nitrogen than venus 78% Vs 3.5% - this question does not make sense" lol.

Unless ofcourse i got the wrong end of the stick and we were supposed to do that 91 pressure thingy that people above have said? Oh well.... Excrutiating 3 month wait until the results :mad:

Reply 361

bla_bla_bla_blaa

DanielOJ

I got a very small number.. something along the lines of.. 0.0014 ppm?

i thought it was 0.0014/100 for one part.. then multiply by 1000000 to get ppm (14)..

why did people end up dividing by 1000? :s

Reply 362

rainbowsss

Overall the paper was okay. It was a weird paper though. I went blank on the ionic equation :s-smilie:

, reflux didn't know what to put, and number 6 i waffled quite a bit, but apart from that it was good haha.. I was expected harder Q on the pre-release..

Reply 363

bla_bla_bla_blaa

mhasan

i was really confused with that nitrogen question. put my hand up and asked 2 teachers both of whom were obviously no help at all :confused:

78 is 22 times bigger than 3.5

Reply 364

DanielOJ

bla_bla_bla_blaa

i thought it was 0.0014/100 for one part.. then multiply by 1000000 to get ppm (14)..

why did people end up dividing by 1000? :s

because the ratio between normal hydrogen and deuterium was 1000/1... so you had to find out the ppm of water vapour in total... then 1000th of this to find out how much of it contained deuterium..

Reply 365

ninetytwo

I thought the iodine in the iodate ion had +5?
In the half formula you added six electrons?

Reply 366

DanielOJ

bla_bla_bla_blaa

78 is 22 times bigger than 3.5

but it asked how many times bigger venus' concentration was than the Earth's.. the other way round..

Reply 367

bla_bla_bla_blaa

DanielOJ

because the ratio between normal hydrogen and deuterium was 1000/1... so you had to find out the ppm of water vapour in total... then 1000th of this to find out how much of it contained deuterium..

oh wow suck my balls, didn't read the second part :/ skipped straight into the calculation

Reply 368

fortunecookie

AGM

Not too bad, not too bad. Could have been much worse and there were no questions that I absolutely struggled 100% on. Thought a couple of questions were a bit vague though, reflux ones and CO2 absorption of IR.

Oooh, reflux. I thought that was a bit wierd as well. What did you get?

Reply 369

bla_bla_bla_blaa

DanielOJ

but it asked how many times bigger venus' concentration was than the Earth's.. the other way round..

oh wow.. you sure? will we get marks off if we wrote 22 then? :Confused:

venus' concentration was lower than the earth's, why would they ask how much venus > earth.. doesnt make sense

Reply 370

mattmitch22

04smitht

(I don't think we can talk specifically about it until 12 o'clock pm)

OCR is only taken in the uk isnt it? Therefore there's no reason why we can't talk about it :smile:

I just read the Exam discussion thing at the top of the page, it only says you can't talk about edexcel etc...
:biggrin:

Reply 371

jetmanchandi

bla_bla_bla_blaa

oh wow suck my balls, didn't read the second part :/ skipped straight into the calculation

yep and me, didn't do the ratio, just lost 2 marks already :frown:

Reply 372

fortunecookie

ninetytwo

I thought the iodine in the iodate ion had +5?
In the half formula you added six electrons?

Oh of course, your right cause it's a negative ion.

Reply 373

Drummermean

ninetytwo

I thought the iodine in the iodate ion had +5?
In the half formula you added six electrons?

It is +5

I thought the test was quite easy apart from some of the question wording and the isomerism etc.

Reply 374

Saphire1

ninetytwo

I thought the iodine in the iodate ion had +5?
In the half formula you added six electrons?

yeah i put +5 but I couldnt work out the half equation until now realising that I forgot the electrons.

Plus I cant believe I put nucleophilic substitution instead of electrophilic addition. :eek3:

Dont know what I was thinking...

I hated the question on drawing the skeletal for the E/Z isomer, I knew what I was supposed to do but just couldnt draw it...

Apart from that it was an okayish paper. :smile:

Reply 375

Saphire1

Drummermean

It is +5

Earth has more than Venus so it would be like Venus has [Venus' atmosphere / Earths atmosphere] = Ans.
Ans is a decimal?
Help?

yeah i got a decimal something like 0.04 (i think i did 3.5/78) :confused:

Reply 376

BeckyDay

Ahhh...I thought I had done okay apart from the calculation questions which I know I've messed up. The Jan paper was so much easier though and the wording was much clearer.

Reply 377

rainbowsss

hmm please say you guys got sulphur was oxidised?

Reply 378

Drummermean

Saphire1

yeah i got a decimal something like 0.04 (i think i did 3.5/78) :confused:

Yeh that's what I put.
But I just looked it up.
Apparently atmospheric pressure would increase amount of molecules so it would be 3.5 x 8000 / 78 so the answer would be like 360 x =/
=[

Reply 379

Drummermean

BeckyDay

Ahhh...I thought I had done okay apart from the calculation questions which I know I've messed up. The Jan paper was so much easier though and the wording was much clearer.