OCR Chemistry AS ATOMS BONDS GROUPS :: POST EXAM DISCUSSION!! How did it go for you? Watch

Freerider101
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#81
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#81
(Original post by TwirlGirl)
Me too! Didnt read the question just jumped straight in :erm:
Yeah I'm fairly gutted now. And I checked the textbook. It does say H+ and HSO4 - ions! So I've lost a mark there too!
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TwirlGirl
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#82
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#82
(Original post by belgianchoco)
What about the question about what color you can see

I put violet and then no change/clear
violet
orange
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juman786
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#83
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#83
(Original post by Freerider101)
Yeah I'm fairly gutted now. And I checked the textbook. It does say H+ and HSO4 - ions! So I've lost a mark there too!
i dont understand, sulfuric acid is a strong acid there it should fully dissociate,
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googoo09
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#84
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#84
ok well new question about that cheeky h2so4.... did you guys put anything on the left hand side of the --->
like did you put h2so4 + aq... or just on its own?
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SophiaKeuning
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#85
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#85
I dunno.... I didn't have to resit. :sexface:
... because a crappy little C is good enough for me. :teehee:
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Freerider101
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#86
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(Original post by belgianchoco)
What about the question about what color you can see

I put violet and then no change/clear
Order was Purple, Orange (already filled in), Orange
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juman786
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#87
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#87
(Original post by googoo09)
ok well new question about that cheeky h2so4.... did you guys put anything on the left hand side of the --->
like did you put h2so4 + aq... or just on its own?
didnt write (aq) , because its only one mark i assumed they werent looking for state symbols,

Beside the question did say the ions are in solution.
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TwirlGirl
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#88
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#88
(Original post by juman786)
i dont understand, sulfuric acid is a strong acid there it should fully dissociate,

Yes i know.

But it has 2 dissociations, so it's a fairly ambiguous question

First dissociation: H+ HSO4-
Second dissociation: 2H+ SO42-

I think we got it wrong though, because in the question i vaguely remember it saying two ions and our answer has three. Annoying!
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juman786
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(Original post by Freerider101)
Order was Purple, Orange (already filled in), Orange

im sure it Cl2 with 2I- (expt:1) was brown =S
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juman786
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#90
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#90
(Original post by TwirlGirl)
Yes i know.

But it has 2 dissociations, so it's a fairly ambiguous question

First dissociation: H+ HSO4-
Second dissociation: 2H+ SO42-

I think we got it wrong though, because in the question i vaguely remember it saying two ions and our answer has three. Annoying!
grrrrrrrrrrrrrrrrrrrr!
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juman786
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#91
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#91
the 2nd question about sub-atomic particles, was that about the no. of electrons, protons and neutrons?
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TwirlGirl
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#92
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#92
(Original post by juman786)
im sure it Cl2 with 2I- (expt:1) was brown =S

brown/orange/yellow are usually all allowed in the MS
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Mainguy
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#93
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#93
(Original post by juman786)
NO , u answer is correct

think about it

H2SO4 , there are two protons therefore 2+ charge from both protons therefore SO4 MUST be 2- in order to balance the charge.

im 100% sure about this, i do A2 Chem
Well on page 22 about 2/3 down it says HSO4-. Only one H+ is released.
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juman786
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#94
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#94
(Original post by Mainguy)
Well on page 22 about 2/3 down it says HSO4-. Only one H+ is released.
kill me...kill me now
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Keorl
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#95
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#95
Any rough ideas how many marks out of 60 would be an A??
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juman786
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#96
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#96
(Original post by Keorl)
Any rough ideas how many marks out of 60 would be an A??
i would say 50 and above
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Keorl
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#97
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#97
(Original post by juman786)
i would say 72 and above

thats 48 out of 60....damn
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juman786
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#98
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#98
rough estimate thoug based upon the grade threshold of jan 09
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BeckyBaby
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#99
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#99
(Original post by Freerider101)
I thought the atomic radii question was kind of hard. Like 4 marks. So I'm assuming you get one for saying they decrease across a period. One for saying because the nuclear charge was increasing. Maybe another for saying that shielding isn't a factor because all the electrons were in the same shell. But I'm not sure where a fourth mark would come from?!
Wasn't it one of the WRC questions? So you'd get a mark for the way you wrote the answer and spelling something easy like "electrons" or something, they've done that in the past.
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BeckyBaby
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#100
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#100
Arrgghh okay. That ionisation question, i think i may have got the energies write, but i wrote down the literal energy figure (ie. 18 723 or whatever they were)
Do you think they'll put that as wrong? Because i didnt answer in the right format?!
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