CHEM1 15 May 2012 AQA OFFICIAL POST EXAM

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Reply 80

CelineG

Original post by 143143143

H3BO3 + NaOH = (2)H2O + NaBO2

I think that was it.

I got that aswell!

Reply 81

DisturbingKand0R

Original post by 143143143

H3BO3 + NaOH = (2)H2O + NaBO2

I think that was it.

that exactly what i did, hope its right

Reply 82

alex7892

Original post by SuziieB

No...I think the paper said that there was more of the 85 isotope of Rb didn't it?

Yeh. Hope 85.6 is correct. Felt quite confident. What did you guys get for the solution question involving moles. Could someone post there method? Also, realised under the horrible exam conditions made an error, I drew cyclobutane or whatever but put double bonds in between each carbon atom. Why didn't i realise that lol!! Oh well, it should be cool. Only one mark.

Reply 83

thetransitionary

Original post by DisturbingKand0R

100% certain more isotope 87, many agree

No it was definitely more of 85

Reply 84

elliannagibbs

Can someone make an unofficial mark scheme?

Reply 85

marleyxd

On the concentration question i ended up with 0.414?? Anyone else :s-smilie:

Reply 86

DisturbingKand0R

Original post by thetransitionary

No it was definitely more of 85

aah mate you are actually scaring me, i thought it said there was 2.5 times more 87. I hope i read it correctly

Reply 87

DisturbingKand0R

Original post by marleyxd

On the concentration question i ended up with 0.414?? Anyone else :s-smilie:

i got 0.73... or something like

Reply 88

CelineG

Original post by elliannagibbs

Can someone make an unofficial mark scheme?

Snap to that... anyone??

Reply 89

SuziieB

Original post by Poolwizard

yeah it did

I almost got a heart attack when I saw people saying 86.4....I was like wtf! I wasn't about to be losing marks on an easy question like that...

Reply 90

Scienceisgood

Did anyone get an answer of 0.7 something for a question in this paper. Can't remember my exact answer or Q number but I definitely got 0.7 for a Q. :tongue:

Reply 91

SuziieB

Original post by DisturbingKand0R

aah mate you are actually scaring me, i thought it said there was 2.5 times more 87. I hope i read it correctly

2.5 times more than 87.

Reply 92

Aqib7

Original post by DisturbingKand0R

yess, let us all pray 86.4 is right

The answer can't be 86.4 because the mass has to be as close to 85 as possible. I got 85.6!

Reply 93

noobslayer

Original post by 143143143

I think they'll be low.
-No definitions
-The 5:1 ratio
-500 cm3 volume
-functional group

What do you mean 500cm^3? it was 5000?

Reply 94

DisturbingKand0R

Original post by Scienceisgood

Did anyone get an answer of 0.7 something for a question in this paper. Can't remember my exact answer or Q number but I definitely got 0.7 for a Q. :tongue:

yes for concentration

Reply 95

mobes

what did u put for y x and y have the same boiling point? i put they both have the same functional group...