CeciliaL

You people are too good lol

kasandude, on May 12, 2011 - 09:59, said:

I thought the general questions were absolutely beautiful... completely opposite to the usual convoluted IB crap, two utterly straightforward ones on language and historical background...

lighthuntz0r, on May 08, 2011 - 14:32, said:

Probably!! I just had a major blackout on that one. I answered all the other questions though so I should still get a good grade. Just bugs me that I missed out on something that simple!

CeciliaL, on May 08, 2011 - 10:52, said:

I think Desy pointed out why you were getting 4 already but...
Ag+NO₃^-->Ag⁺+NO

NO₃^-->NO
Balance oxygen with water
NO₃^-->NO+2H₂O
Balance hydrogens with H⁺
4H⁺+NO₃^-->NO+2H₂O
balance charges with electrons (I think this is where you messed up and got four )
3e^-+4H⁺+NO₃^-->NO+2H₂O

Ag->Ag⁺
Nothing to balance but electrons
Ag->Ag⁺+e^-

3e^-+4H⁺+NO₃^-->NO+2H₂O
3(Ag->Ag⁺+e^-)
When you combine them the electrons need to completely cancel out so you need to multiple the silver equation by 3

3e^-+4H⁺+NO₃^-->NO+2H₂O
3Ag->3Ag⁺+3e^-
From here you can start cancelling (which is only the electrons in this case)

3e^-+4H⁺+NO₃^-->NO+2H₂O
3Ag->3Ag⁺+3e^-

Combine it all together and make sure your original stuff given goes before the added water and electrons (don't ask why, IB likes it...)
NO₃^-+3Ag+4H⁺->NO+3Ag⁺+2H₂O

I hope I didn't miss anything. Too much bbc code
_____________________________________________________________________

CeciliaL, on May 08, 2011 - 13:51, said:

A
Average kinetic energy would be the kinetic energy/number of particles
1mol is 6.02*10^23
2mol is 2(6.02*10^23)
3mol is 3(6.02*10^23)
The kinetic energy is the same since temperature is the average kinetic energy of the system.
So CO₂ would have (ideally) 1/3 the kinetic energy because it ends up being divided by the ratio of 3. Hope that made sense also...

Hah I'm just happy that it's over...math has been torturous these last two years!!!

qn3)
Ar(Fe)=55.85
Ar(S)=32.06

n(Fe)=mass/Ar
=10/55.85
=0.179 mol

n(S)=mass/Ar
=10/32.06
=0.312 mol

So Fe is the limiting reagent.

n(FeS)=n(Fe)
=0.179 mol

mass(FeS)=n*Mr
=0.179*(55.85+32.06)
=(10/55.85)*(55.85+32.06)
=(10/55.85)*(87.91)
=87.91*10.0/55.85 (B)

You guys, for the last question in paper 2... the one with the trapezium and finding the values for the angle, I just sketched y= 4sin0 + 2sin20  and y= 5 separately and found the intersection point... Would that give me the value of the angle?

This paper was okay, but a bit tough. It wasn't hard. Besides, we should have expected a somewhat "tough" paper because the first paper was extremely easy. The last question did indeed prove to be the toughest question in the paper, but this is IB: there is ALWAYS a question that looks new, i.e. has not been asked before, and thus is a bit tough. Cynthia, I wouldn't be surprised if the both of us get the same marks; we both think about questions the same way and have similar answers. As compared to the paper in November 2010, this was way easier. Overall, the whole paper was doable and no one should have had trouble with this. The vectors question was like a generous gift by the IB. This is what they always ask. It's in all papers. Everyone should have got that one right. Can't remember the others... I want to discuss questions you guys want to discuss. Good luck with chemistry on Monday because I know I'm terrified of the HL papers for that day.

Did ANYONE get the very last question, 10.C ? It was worth 7 points and no one at my school seemed to get it.

I had 30 minutes left for the whole of last question, 10, which was 16 points and I'm pretty sure I only got about 2 points on it in total.


The rest of the paper was very easy.

Hey for the ln transformation I put down vertical stretch scale factor 1/5.. it was 3 marks so I thought just a shift would be too easy..

snarker, on May 04, 2011 - 18:40, said:

You just made me feel better! I wrote about something similar and how the fact that the snow is personified and then it melts (the hills turn to water and the windows crack or something like that) indicates mortality and the end of life and how the snow does also symbolize this revelation of mortality and in the beginning how snow is sort of compared to a graveyard through an underlying metaphor " you are the country of ghosts" as well as the thing with the magician with the handkerchief...another metaphor...the handkerchief is white = snow...and how when a magician pulls away his handkerchief something usually disappears...so i talked about the suddenness of death...

I don't know...I usually score 7s and 6s on my papers but this is the first time I feel completely at loss...and the poem is nowhere to be found online!

P.S. Math also makes me cringe.

Double P.S. I didn't even look at the prose section.

A1 HL English TZ2! I did the poem too, and afterwards everyone in my class said they had written about life after death with the snow acting as the clouds and "the country of ghosts2 being heaven. I saw it afterwards when they said and started freaking out because I'd written about how the snow is a reflection of the individual and when everything is blank and there is no direction, it comes down to individualism, etc. But I guess as long as you support it with evidence then you can't go too wrong. I can't find the poem anywhere though!

Wow that's scary. Um..haha. I don't know I considered that Snow = cold = winter = death and that it symbolizes this sense of mortality this realization of mortality...I don't remember but I found quite a few instances and then at the end I discussed how the snow melting is like this rapid realization and life melting away...and I discussed how when he says " Snow, you are a country of ghosts" etc...its like an indirect metaphor in which he compared the surrounding snow to a graveyard... thats why I got the idea of mortality..

I'm in TZ2 and did the poetry.

In a nutshell, I addressed mainly the author's use of the motifs of rootlessness and misfitting and the melancholy tone to convey the theme of identity, thus conveying the author's didactic resent of the feelings of rootlessness created by immigration.

The "scratching" I said conveyed the persona's struggle to fit in to the society; I referred to the title "Minority" to clarify that point, since the persona states in the first line of the poem "I was born a foreigner" and then says something about always having been a foreigner wherever he/she went. Using that, I talked about how it portrays the theme of identity, since the persona doesn't feel like he/she fits in anywhere - not at the "home country" or the country to which he/she migrated.

Basically, I just said the whole thing's about feelings of rootlessness and dis-belonging.

CeciliaL, on Mar 19, 2011 - 13:03, said:

Modifying the model just means adjusting it. So if you're at the part where they give you IMF data and they ask you to modify your model, all you have to do is take your current model, enter in the new IMF data, and then generate a new function that fits the IMF data points plus the original data points from before (so all the data points will be in one model).