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

juman786
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#121
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#121
(Original post by 786girl)
was the last one not qwc i wasted my time writing neatly then!
and u know for the trigonal planar question i drew it wrong
i had 3 bonded atoms but they wernt spread out equally for sme reason i drew them nearer to the bottom like the NH3 without the lone pairs
...omg i despise that paper.

u werent meant to draw the shapes so its ok
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Freerider101
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#122
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(Original post by Mainguy)
I did the same thing...It was a two mark question, so I think we'd get one mark for 'H+', since it said two ions.
Fairly confident it was a 1 mark Q
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AnthonyShock
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#123
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(Original post by Mainguy)
I did the same thing...It was a two mark question, so I think we'd get one mark for 'H+', since it said two ions.
Weeeeey great!
How did you find the paper?
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juman786
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#124
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(Original post by AnthonyShock)
I LOVED this paper! Mind I'm doing A2 Chem so I cannot feel too smug bout it lol

I put for the ion uestion that H+ and SO4- would be present. I made a silly mistake here as I know SO4 is a 2- ion. Was it a one mark or two mark question?
i knew its SO42- !!!


Guys please look at the A2 Chem book, its SO42-!!!!!!

, it was a 1 mark
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princesssss
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#125
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#125
for the "what colour would the solution go if an organic solv. was added" question, the last box was nothing
Br2 cannot replace Cl- ions.
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FoOtYdUdE
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#126
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(Original post by princesssss)
for the "what colour would the solution go if an organic solv. was added" question, the last box was nothing
Br2 cannot replace Cl- ions.
it remained orange!!
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FoOtYdUdE
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#127
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#127
that extra experiment they did was

br2 +2I- >> 2br- +i2

cuz they wanted to know the order reactivity

cl2> br2>i2

cl is more powerful oxidising agent than romine. and bromine is a more powerful oxidising agent than iodine.
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juman786
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#128
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#128
(Original post by FoOtYdUdE)
it remained orange!!
its not orange!

orange is when Cl2 is bubbled through 2Br-. that was expt:2

in Expt:3, Br2 was bubbled thought Cl2, so it no reaction. all the ions, Cl-, Br- and I- are colourless in solution. so like the other person i wrote colourless too
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FoOtYdUdE
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#129
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#129
(Original post by princesssss)
yeahh thats what i put )))
are you sure its right? i guessed LOL
deffo ryt.
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Freerider101
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#130
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#130
(Original post by 786girl)
btw can i just say that just because we are here dicussing the things we got wrong think about the people who failed and arent on here
i hope nationally people flopped lmao
Most of my friends were so confident they don't check sites like TSR. They basically know they've only dropped maybe 1-2 marks so they just leave it! So its hard to tell how the nation found the paper on average! Also for some people dropping 5 marks is an epic fail and for others maybe dropping 15 marks is a good run, so its hard to say for deffinate!
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princesssss
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#131
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#131
what was this paper out of?
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juman786
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#132
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#132
(Original post by princesssss)
what was this paper out of?
60 raw score which is then convetred to 90 UMS marks
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princesssss
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#133
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#133
(Original post by juman786)
60 raw score which is then convetred to 90 UMS marks
What does the UMS actaully mean? ive never understood?
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Jesska xD
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#134
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(Original post by princesssss)
What does the UMS actaully mean? ive never understood?
80 UMS = A
70 UMS = B
60 UMS = C
50 UMS = D
40 UMS = E
Below 40 = U

It just converts it into grade boundaries really i think but its not % which some people think it is. It depends on how hard or easy people found the exam.

E.g.

One year it could be 51/60 for an A and that would be 80 UMS
othertimes it could be 43/60 for the A boundary if people found it really challenging.
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juman786
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#135
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#135
(Original post by princesssss)
What does the UMS actaully mean? ive never understood?

basically the examiners gather up the total raw scores scored by the whole of the UK. they then convert the raw score to UMS which is out of 90. they then work out the average UMS score and this becomes a C. any UMS score above the average is B or A. anything below is D, E, or U
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TwilightKnight
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#136
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#136
(Original post by Bukkerz)
I put H+ and SO42-, I think the question said name the formulae of the ions produced when in water. I didn't even know about the other ions haha.

About the NF3, what did people put? I was confused, because the flourines are more electronegative, and so you have the delta negative fluorines, but then there is the lone pair on the nitrogen. I pretty sure it's wrong now but I went for the lone pair on the nitrogen giving that end a negative charge, and just ignoring the fluorines entirely. Ah well.

Fluorine also has 3 lone pairs when bonded.

Just sayin'.
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Varciani
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#137
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#137
Does anyone know if an unofficial mark scheme will be released?
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TwilightKnight
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#138
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#138
(Original post by juman786)
its not orange!

orange is when Cl2 is bubbled through 2Br-. that was expt:2

in Expt:3, Br2 was bubbled thought Cl2, so it no reaction. all the ions, Cl-, Br- and I- are colourless in solution. so like the other person i wrote colourless too
You're missing the point. Br2 didn't react, and so was dissolved by the organic solvent, that's why it went orange.

Think about what you do during a halogen displacement reaction - you create a diatomic molecule from 2 aqueous ions. It's the diatomic molecule that's dissolved in the organic solvent, not the aqueous ions.
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princesssss
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#139
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#139
(Original post by TwilightKnight)
You're missing the point. Br2 didn't react, and so was dissolved by the organic solvent, that's why it went orange.

Think about what you do during a halogen displacement reaction - you create a diatomic molecule from 2 aqueous ions. It's the diatomic molecule that's dissolved in the organic solvent, not the aqueous ions.
This was only worth one mark, i wouldnt worry too much
actually saying that one mark could means getting an A not a B
so continue...
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tara_natalie
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#140
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#140
Does anyone have an unofficial mark scheme?
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