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Exam 2 Thoughts

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melodrama:
Yay/nay?

Easier BY FAR than the 06 paper. That damned paper sent me into a frenzied panic this morning.

melodrama:
My answers:

BDCDBDABADACBBACCDBC

Mg, U, Al, B, O, Sn
Mass spectrometer
113, 113, 171
3, 7
Tl
279Rg

[He]2s2/2p2, [Ar]3d6/4s2, [Ar]3d5
Group 6 Period 5

C6H12O6
Cwhatever+12O2 -> 12CO2+11H2O
-5632kJmol^-1 (x2 because maltose has two glucoses)
30

goes to C17H35COOCH3 + H2O (sorry, typo)

Z group was CH3
Z2, Z1
Denatured by pH
198
6.69g
19.1g
5.73x10^3kJmol^-1

Platinum
25deg. C
pH 0
Cd (s) increase pH, decrease H+... etc. etc. Cd is oxidised


0.0275 mol
1:1
+1
goes to X2+ + e- -> X+ (apparently it's X3+, with the oxidation state +3)
Cu2+ + 2e- -> Cu
941C
4.8 x 10^-3 mol
9.78 x 10^4Cmol^-1
Cu fell off

Collin Li:
Anyone got a copy of the exam paper? If someone gets it to me... like now, I could produce solutions before I head off to my chemistry exam.

kingmar:
Extremely tricky. Simplistic in places, but overall tricky.

BTW, spirited, your "X" thingy is wrong. It's X2+ loses an electron to form X3+.

cara.mel:
In the 2nd last question, X is losing electrons
X2+ -> X3+ +e-

The last multi choice was worded bad. I put D, because I thought it meant 'the amount of energy in each form turned into electrical'. So in the turbine nearly all of the energy -> electrical, but in the coal only a small amount turns into electicity. My chem teacher put C. Meh, don't care any more.

Overall, I thought it was of a good difficulty, so I'm happy with it :)

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