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

1. I'm migrating to this thread after biology today
2. (Original post by haydyb123)
how was it? What came up?
You gave me a heart attack. i thought i missed my exam!
Chemistry teacher at my college, some useful videos for this A2 Unit
4. (Original post by INeedToRevise)
I'm migrating to this thread after biology today
me too!
5. 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?
6. 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
7. (Original post by haydyb123)
Chemistry teacher at my college, some useful videos for this A2 Unit
Watching this right now 0.o
8. 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

9. 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 1 and a bit days to revise

Also, does anyone have Januarys exam for this paper?
10. (Original post by 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 2H20

Charges and atoms need to be balanced
11. (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
12. someone help me with 7b please june 2010
13. (Original post by 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

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
14. Jan 11 question 1.

in the m/s it says the answer is 8..3 10^4 but i keep getting 0.000108??
15. ooooh nvm i got it!!!
16. (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[NO2]^2)
17. (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
18. Has anyone got any revision notes they are kind enough to share?
19. Has anyone got a bunch of calculations for redox/finding out identities that they can share? They are fun
20. (Original post by NWA)
Has anyone got any revision notes they are kind enough to share?
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
Attached Files
21. module 3 transition elements.docx (185.6 KB, 421 views)
22. chemistry notes module 1.docx (103.5 KB, 290 views)
23. CHEMISTRY things to learn.docx (71.3 KB, 147 views)
24. energy2.docx (82.4 KB, 428 views)
25. Chemistry.docx (61.1 KB, 286 views)

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