Equilibria, Energetics and Elements (F325) - June 2011 Exam.

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Reply 860

INeedToRevise

I'm migrating to this thread after biology today :smile:

Reply 861

Student21

Original post by haydyb123

how was it? What came up?

You gave me a heart attack. i thought i missed my exam!

Reply 862

haydyb123

http://www.youtube.com/user/bradyexplains#p/a/u/1/69n6KLvr_Uk
Chemistry teacher at my college, some useful videos for this A2 Unit

Reply 863

volvicstar

Original post by INeedToRevise

I'm migrating to this thread after biology today :smile:

me too!

Reply 864

Flux_Pav

can someone please explain 7b on june 2010 - i got it correct up the point where the moles of h202 is 1.1725x10^-3 . but when it asks you to find the undiluted, isn't that the 25cm3 bit - so with that figure i have - i went straight on to calculate concentration LOL

so any1 here to help?

Reply 865

intellectual1

Only the CALCULATIONS will be relevant from the legacy papers. Alot of the questions will be similar to Jan11 from now onwards the examiners report says

Reply 866

blush.ox

Original post by haydyb123

http://www.youtube.com/user/bradyexplains#p/a/u/1/69n6KLvr_Uk
Chemistry teacher at my college, some useful videos for this A2 Unit

Watching this right now 0.o

Reply 867

786girl

on the 2010 june paper q. 2 a)

how do u balance the ionic equation:

...BrO3- (overall charge is -) + ......Br- + ....H+ = ......Br2 + ......H20

i got 6H+ and 3H20

but its meant to be
5br- 6h+ 3br2 and 3H20

explain why pleasee

(edited 12 years ago)

Reply 868

yesioo

Right change of plan. Looks like after today's disaster I'm going to need to get a B at least in this paper. Although I thought it was on Friday :emo:

1 and a bit days to revise :facepalm:

Also, does anyone have Januarys exam for this paper?

(edited 12 years ago)

Reply 869

Killmepls

Original post by 786girl

Charges and atoms need to be balanced

Reply 870

786girl

Original post by Killmepls

Charges and atoms need to be balanced

huh? how do you balance the charges? :s sorry i dont get it.... can u explain it to me please ? omg i feel so dumb right now

Reply 871

Flux_Pav

someone help me with 7b please june 2010

Reply 872

CoventryCity

Original post by 786girl

We balance oxygen with water so we put 3H20. Then we balance H with H+ so we need 6 H+.
Overall charge on LHS = (-)+(-)+(6+)= 4+
Overall charge on RHS is 0
To balance the charge we need to add 4- which comes from Br- so we add 4 more Br - making that 5Br-.
Then we balance the Br2 by making 3Br2

Reply 873

yesioo

Jan 11 question 1.

in the m/s it says the answer is 8..3 10^4 but i keep getting 0.000108??

Reply 874

786girl

ooooh nvm i got it!!! :biggrin:

Reply 875

wilsea05

Original post by yesioo

Jan 11 question 1.

in the m/s it says the answer is 8..3 10^4 but i keep getting 0.000108??

k= rate/(

x[NO2]^2)

Reply 876

CoventryCity

Original post by yesioo

Jan 11 question 1.

in the m/s it says the answer is 8..3 10^4 but i keep getting 0.000108??

K= Rate / ((H2) x (NO)^2)

3.6x10^-2 / ( (1.2x10^-2) x (6x10^-3)^2) = 8.3x10^4

Reply 877

NWA

Has anyone got any revision notes they are kind enough to share? :smile:

Reply 878

Killmepls

Has anyone got a bunch of calculations for redox/finding out identities that they can share? They are fun :colondollar:

Reply 879

Guinea Pig Lover

Original post by NWA

Has anyone got any revision notes they are kind enough to share? :smile:

All sorts of weird and wonderful notes from my computer here, including a little worksheet thing I made to go through the specification

Hope they help! x

module 3 transition elements.docx190.1KB

chemistry notes module 1.docx106.0KB

CHEMISTRY things to learn.docx73.0KB

energy2.docx84.4KB

Chemistry.docx62.6KB