9 years ago
#241
Abstraction did u get it was octrahedral shaped or trigonal bipyrimidal
0
9 years ago
#242
it cant be c cos draw the molecule out honestly u will see that 4 electrons remin cos remeber the other idoines are the same is not like 1 elctron from idoine binds with 1 elctron in anoth iodine.
0
9 years ago
#243
(Original post by koolcat6)
because after a while the reaction will cool down

btwabstraction is 14 not a im deffo sure btw
How can it be A? Top layer over bottom layer. It can't be less than 1 for a start as clearly the top layer required greater neutralisation and thus had a greater conc.
0
9 years ago
#244
(Original post by koolcat6)
Abstraction did u get it was octrahedral shaped or trigonal bipyrimidal
If you are talking about the iodinepentafluoride, trigonal bipyramidal.
0
9 years ago
#245
(Original post by koolcat6)
it cant be c cos draw the molecule out honestly u will see that 4 electrons remin cos remeber the other idoines are the same is not like 1 elctron from idoine binds with 1 elctron in anoth iodine.
Cba explaining but it definetely can't be B. Why because the molecule is linear as shown here:

http://en.wikipedia.org/wiki/Triiodide
0
9 years ago
#246
that paper wis a piece of piss! ahahahaha just kiddin

dont think i done too bad considering i never studied. id be happy with a D
0
9 years ago
#247
nUMBER 14

partion = chlorofrom divided by water
moles in chlorform = 0.0133 multply by 0.05= 0.000665

moles in water = 0.002 multiply by 0.05 = 0.001

so 0.000665 divide by 0.001= 0.665 something
0
9 years ago
#248
(Original post by koolcat6)
nUMBER 14

partion = chlorofrom divided by water
moles in chlorform = 0.0133 multply by 0.05= 0.000665

moles in water = 0.002 multiply by 0.05 = 0.001

so 0.000665 divide by 0.001= 0.665 something
Yes, but the partition coefficient is the top layer over the bottom layer.
0
9 years ago
#249
no it applies to the equatoion does it not which is water to chlrofrom
0
9 years ago
#250
(Original post by koolcat6)
no it applies to the equatoion does it not which is water to chlrofrom
??
0
9 years ago
#251
does anyone know what the % to get an A last year was. 2007 you had to get 70 percent aghhh
0
9 years ago
#252
Im not sure abstractions you are probably right cos you seem much smarter then me at chemistry but i thought that it applied to the equation in calculating parition coefficent which is product over reactant does not apply to the diagram
0
9 years ago
#253
(Original post by koolcat6)
Im not sure abstractions you are probably right cos you seem much smarter then me at chemistry but i thought that it applied to the equation in calculating parition coefficent which is product over reactant does not apply to the diagram
Haha you reckon. I'm pretty sure I've seen similar questions and I'm afraid its top layer over bottom. Hey, its one mark. I got the stupid adding NaOH one wrong. Meh, these things happen.

EDIT: In retrospect I think you are correct about it being 0. whatever. Cheeky question, but I suppose K does equal the right over the left.
0
9 years ago
#254
i feel like crying after that! i studyed so much and still found it pure hard! like i thought some of it was okay but some of the questions were like wtf! lol
0
9 years ago
#255
For MC q7, I know you've got wikipedia etc. but from what's shown (in the question) is it not basic because it reacts with acid forming a salt and water? In the second equation you're just dissolving it in sodium hydroxide solution, no water is actually produced.

Overall it was fair I think, bit strange there was not stoichiometry question or reaction mechanism...
0
9 years ago
#256
i thought that as crazy hard though looking at everyone elses answers i think i got 22 on the multiple choice and 44 on the other bit which is better than i thought but still annoying. i think my investigation is really good so if i get like 20 on it i may still be able to get and A if the mark is lowered?

what do u think?

also for mc 10 i put c? why isn't it c?

and on 3 b i put atomisation? and -2326

does anyone no all the right answers for the mc?
0
9 years ago
#257
Hi here's my MC answers, i know i got 4 wrong, my chem teacher told me its B, point out any other noticed mistakes please! thanks!

1 D
2 D
3 A
4 D (apparently right answer is B which i had and changed )
5 A
6 C
7 D
8 B
9 D
10 C
11 B
12 C
13 A
14 C
15 D
16 A
17 A
18 C
19 B (i guessed)
20 A
21 B
22 A (i guessed that too)
23 A
24 C
25 B
26 D
27 B
28 A
29 C
30 C
31 B
32 B
33 C
34 D
35 D
36 A
37 A
38 D
39 C
40 A

let me know if thats good or bad, i'm not sure!
0
9 years ago
#258
HA. HA. HA.

Didn't study for it, and it showed
0
9 years ago
#259
(Original post by abstraction98)
cba starting a new page..

Was a fair exam I thought. Totally played the exam and guessed that ZnO was amphoteric - it is..

Got the "what is the sodium hydrogencarbonate for" one wrong. A few other bits I'm slightly worried about, but nothing drastic. Multiple choice answers:

1. D
2. D
3. A
4. C
5. A
6. C
7. D (http://en.wikipedia.org/wiki/Amphoteric)
8. B
9. D
10. C
11. C ~
12. D
13. A
14. C
15. B
16. C
17. A
18. A
19. D
20. B
21. B
22. C
23. A
24. C
25. B
26. D
27. D
28. A
29. C
30. C
31. B
32. C
33. C
34. D
35. B
36. A
37. B
38. B
39. C
40. C

we're quite similar - you seem to know your stuff so thats cheered me up.....looking back I can't believe I've got 2 of the most simple MC Qs wrong - 5(didn't read the Q - thought it was a pn-junction) and 12......my own fault
0
9 years ago
#260
(Original post by akj08)
For MC q7, I know you've got wikipedia etc. but from what's shown (in the question) is it not basic because it reacts with acid forming a salt and water? In the second equation you're just dissolving it in sodium hydroxide solution, no water is actually produced.

Overall it was fair I think, bit strange there was not stoichiometry question or reaction mechanism...
Yes, it's basic in the first but acidic in the second. I had a hunch that aluminium oxide does the same thing which is why I went for it. The zinc and hydroxyl group are actually a 2- ion. I agree, its a hard question. On that wikipedia page scroll down and it has exactly the same reactions..

What did you get for mc 11 and 14

Agree? No mechanism or titration etc.!?
0
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