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OCR 21st Century Science C4 C5 C6 14th June 2016 Discussion thread

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Original post by Ella_08
Glad someone feels the same way :/ I had no clue what I was doing. I've definitely got the last question wrong and the first page was nasty. I completely messed up some of the equations too. Uuuh i'm so disappointed. We still have C7

They don't deserve capitals :no:


I know, I was really confused most of the paper. Although it was my weakest unit it annoyed me that there was pretty much nothing on C6 - as I've spent all morning revising it! Although thank got there wasn't a 6 marker on titrations!!! I really didn't like much of it at all. And oh god, don't remind me about C7 :frown: haha

And tbh I'm surprised they can even use them 👎🏻
Reply 101
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Ben.M
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Original post by NiamhM1801
Why was there so much salt
What was the obsession with salt


OCR seem to really love salt. :rolleyes: There's loads of salt in C3 too.

Original post by NiamhM1801
No way was it really chlorine? I put that (I did keep it though luckily) but it really confused me as chlorine's poisonous and irritates eyes? Lol great stuff sunglasses company


Yeah, now I'm never going to buy light reactant sunglasses again!
Original post by NiamhM1801
Was the one that should have given -30°C 50g? I did it in 2 seconds because I was really pushed for time and didn't have time to check :frown:

Also what did you all get for the half equation? I think I got it wrong as my friends got something different. I put Pb⁴+ + 4e- -> Pb


i put Pb²+ + 2e- --> Pb
Original post by Ben.M
OCR seem to really love salt. :rolleyes: There's loads of salt in C3 too.


Yeah, and it should stay in C3, where it BELONGS.

Original post by Ben.M
Yeah, now I'm never going to buy light reactant sunglasses again!


Wow. I mean I never had any anyway but I definitely won't buy any now haha
Original post by Ella_08
did anyone tick relative atomic mass for that tick box question? Idk if it's right :/


I swear it's proton number?
Original post by louisemayorx
i put Pb²+ + 2e- --> Pb


That's what my friends put. But lead is in group 4??
Reply 106
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Ben.M
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Original post by NiamhM1801
Was the one that should have given -30°C 50g? I did it in 2 seconds because I was really pushed for time and didn't have time to check :frown:

Also what did you all get for the half equation? I think I got it wrong as my friends got something different. I put Pb⁴+ + 4e- -> Pb


I put 50g too and worked it out properly.

I think the right answer is Pb2+ + 2e- > Pb but I put Pb2+ > Pb2 - 2e- which I'm not sure might be kind of right rearranged?
Original post by NiamhM1801
I know, I was really confused most of the paper. Although it was my weakest unit it annoyed me that there was pretty much nothing on C6 - as I've spent all morning revising it! Although thank got there wasn't a 6 marker on titrations!!! I really didn't like much of it at all. And oh god, don't remind me about C7 :frown: haha

And tbh I'm surprised they can even use them 👎🏻


I was just flicking through the paper silently panicking :thumbsdown:Yeah ikr, all i remember is salt and stupid mendeleev. I really want someone to make an unofficial mark scheme, might help me sleep at night. So sad the environment didn't come up, that's my specialism. I'm gonna do C7 now, come on - it's not that bad :biggrin: i want to cry now though omg
Original post by NiamhM1801
That's what my friends put. But lead is in group 4??


yes but the way i did it is that we do this thing called "drop and swap" to work out the formulae of things e.g. magnesium chloride is Mg(2+) and Cl(1-) so doing drop and swap, the formula is MgCl2. (i'm sorry if that makes absolutely no sense.)

so the formula given was PbBr2 so working backwards i worked out that the charge of the lead would be 2+ but i have no idea if that is correct!
Original post by NiamhM1801
That's what my friends put. But lead is in group 4??


I got the same half-equation as you. I would have thought that lead would form a 4+ ion since it's in group 4 but it seems that it forms a 2+ (?)...
Original post by NiamhM1801
That's what my friends put. But lead is in group 4??
I put something like Pb4e- > PB + 4e, lead is in group 4 so needs 4 electrons to fill its outer shell
Original post by Deliciate
I got the same half-equation as you. I would have thought that lead would form a 4+ ion since it's in group 4 but it seems that it forms a 2+ (?)...


Yeah that was my reasoning. Also because the overall charge on the bromine ions was 4- (as it was 2 x 2-) but apparently that's wrong. According to bitesize it should be what everyone else has put :frown:
I definitely messed up the last question, most people here said they did a diagonal from left, middle, right. Mine was from right, middle, left. I had like 4 seconds left at the end so just ticked random boxes
Reply 113
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Ben.M
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Original post by NiamhM1801
Yeah, and it should stay in C3, where it BELONGS.Wow. I mean I never had any anyway but I definitely won't buy any now haha


Yeah don't they know too much for salt is bad for us :biggrin:

Original post by NiamhM1801
That's what my friends put. But lead is in group 4??


Lead is in group 4, which confused me, but it's one of those weird ones like iron I think, where it's like Lead (II)? I don't know how it works, but I just remembered that lead was Pb2+
(edited 7 years ago)
Original post by Ella_08
I was just flicking through the paper silently panicking :thumbsdown:Yeah ikr, all i remember is salt and stupid mendeleev. I really want someone to make an unofficial mark scheme, might help me sleep at night. So sad the environment didn't come up, that's my specialism. I'm gonna do C7 now, come on - it's not that bad :biggrin: i want to cry now though omg


I know, it was the middle of the paper that really just made me want to give up! All I remember is bloody diamond and graphite and it didn't even come up :frown: same, I'd contribute but I got lots wrong haha. I'm glad the environment didn't come up - that's where I always go wrong. I'm doing P456 today ahead of Thursday. That should be nice, I love physics :biggrin:
Same tbh, at first I thought the paper was ok but now I've realised just how badly I've done! :frown:
Original post by louisemayorx
yes but the way i did it is that we do this thing called "drop and swap" to work out the formulae of things e.g. magnesium chloride is Mg(2+) and Cl(1-) so doing drop and swap, the formula is MgCl2. (i'm sorry if that makes absolutely no sense.)

so the formula given was PbBr2 so working backwards i worked out that the charge of the lead would be 2+ but i have no idea if that is correct!


Well yeah, but both of them apparently had a charge of 2? Which would not have made sense seeing as how there were 2 Bromine atoms and only 1 Lead atom (and they have to balance)

The correct half equation makes no sense to me at all.
I did middle right right but my friend got the same as you so I'm unsure 😹😂😂
Original post by Char4ncubex
I did middle right right but my friend got the same as you so I'm unsure 😹😂😂


i did middle right right too but no offence to you, i was literally making up science to justify in my head why i chose them ones (a.k.a guesses). but hey, i still have hope!
Original post by Mr_Elmo
I really liked that paper funnily enough, a couple things were confusing but not too bad. Did you have to discuss bonds forming vs breaking on the last 6 marker, as im sure that is part of C7. I simply discussed what the graphs showed and what it meant in terms of energy


I was thinking about discussing the breaking and making of binds but I saw a makeup scheme I think for 2013 on the same topic (energy level graphs) and it says no marks credited for speaking of this
anyone know what the grade boundaries will be like?

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