ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: 8039 on June 06, 2010, 08:27:51 pm
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I can't find any of these trial exams anywhere, the official TSFX website won't even fix the link to the supposedly free trial exam (I wonder why).
Saw one practice one a bit earlier on here (I think) but thread got deleted... can someone at least give me an example of a HARD question on one of these notoriously difficult trials?
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You register on their website
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here is the 2010 one
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Thank you so much! time to get a dose of discouragement! :)
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haha youll be right :)
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Thank you so much! time to get a dose of discouragement! :)
from what I have heard, you are after the CSE if you want discouragement, or NEAP 2010 works fine too.
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CSE isn't bad, going through NEAP was like going through a bush filled with thorns...
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from what I have heard, you are after the CSE if you want discouragement, or NEAP 2010 works fine too.
Haha! my teacher said it's a total pain and that I should leave it till last. I started doing it cause I mistook it for another trial and actually finding it pretty easy so far. Got 18/20 for the multiple and half way through short answer with a mark lost on 2.e, but not even sure tho, it's just different from the answer at the back.
Finding TSFX multiples pretty easy so far, got one wrong so far...
NEAP which I got from this website not long ago I'm finding fairly easy atm, did almost perfect on multiple and got full marks on question 3 and 4... haven't bothered starting the rest yet
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I thought it was (hymen) ball breaker if i may say so myself.
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By CSE you mean IARTV right Martoman?
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I thought it was (hymen) ball breaker if i may say so myself.
I found any questions relating to year 11 stuff ballbreaking since I didn't do year 11 chem -_-
Luckily it's all to do with pH levels but still messing them up easily
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By CSE you mean IARTV right Martoman?
Is there another one? my one is May IARTV 2010 written examination 1
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lol yea just making sure, because like Martoman is PRO and I felt like something was wrong when I read her post.
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i haven't done that one. Was referring to NEAP 2010.
That was my first one and we hadn't finished the course >.<
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I don't see what was so bad about neap 2010 :S. I got lucky on a few questions though.
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Na it wasn't hard.
But you have to understand. For me first one and hadn't even done reaction pathways >.<
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Na it wasn't hard.
But you have to understand. For me first one and hadn't even done reaction pathways >.<
Ohh so you're doing year 11, are you one of those who do year 12 subjects on top of everything?
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lol martoman, ur not asian, but ">.<" IS just so asian it makes me laugh XD.
don't worry ur the genius one remember. I support Maos nomination of u as Mod!
And is tsfx really worth doing sometimes?
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I don't see what was so bad about neap 2010 :S. I got lucky on a few questions though.
keep in mind that neap was one of the first exams that many people sat, it wa my first and I wasn't finished the course yet either, on top of that time management was tough (first exam taking it slow getting a feel for it)
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tsfx has some questions that would really catch you off guard if you didn't know the syllabus like the back of your hand, so I'd suggest it.
The one I think is the hardest one I've come across is this KBT lectures one... geez looks daunting.
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Na it wasn't hard.
But you have to understand. For me first one and hadn't even done reaction pathways >.<
Ohh so you're doing year 11, are you one of those who do year 12 subjects on top of everything?
Yeah i'm one of *those* kids who didn't do 1-2 chem. *sigh* sometimes I feel like i'm missing out.
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KBT looked challenging, but, honestly, not impossible. Lots of long questions though...
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KBT?
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neap 2010 had a crapload of explain stuff too which wasnt too hard.
but for people who hadnt finished the coursework it probs would have been a bitch
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KBT looked challenging, but, honestly, not impossible. Lots of long questions though...
Lol when it asked me to find the mol of electrons that were involved in the reaction that formed the
Cr3+, I died a little inside.
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KBT?
Here. A free exam from a lecture organisation three 99.95s from last year organised.
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KBT?
Here. A free exam from a lecture organisation three 99.95s from last year organised.
It's definitely the hardest one I've seen yet. And the answers go into much detail so I'd recommend this test as the last one you attempt.
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Easily the hardest exam is KBT. A little unrealistic, with the electrons question, the electrical conductivity question, and VCAA would at most, although highly unlikely, get us to draw ONE nucleotide, at best.
I doubt it would even happen though, as the examiners have to mark it somehow...
The chromatography question went on forever also, and it was difficult to count the NMR splits, which in the end you didn't really have to worry about.
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Also, can anyone explain the solubilities of glycogen, starch and cellulose?
I get that:
glycogen = highly branched
starch = branched
cellulose = unbranched
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Cellulose is insoluble in water because of its tightly packed structure.
I think the other two are soluble, though gylcogen moreso than starch.
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Cellulose is insoluble in water because of its tightly packed structure.
I think the other two are soluble, though gylcogen moreso than starch.
Generally, polysaccharides are insoluble. Think about it: they are HUGE molecules made up of glucose monomers. They're ability to form hydrogen bonds with water is low, because of their size, and so are insoluble.
They are, however, polar.
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Cellulose is insoluble in water because of its tightly packed structure.
I think the other two are soluble, though gylcogen moreso than starch.
Generally, polysaccharides are insoluble. Think about it: they are HUGE molecules made up of glucose monomers. They're ability to form hydrogen bonds with water is low, because of their size, and so are insoluble.
They are, however, polar.
So the Intramolecular forces are GREATER, then the strength of the Hydrogen bonding?
Meaning its insoluble, due to the low formation of H Bonds?
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Cellulose is insoluble in water because of its tightly packed structure.
I think the other two are soluble, though gylcogen moreso than starch.
Generally, polysaccharides are insoluble. Think about it: they are HUGE molecules made up of glucose monomers. They're ability to form hydrogen bonds with water is low, because of their size, and so are insoluble.
They are, however, polar.
So the Intramolecular forces are GREATER, then the strength of the Hydrogen bonding?
Meaning its insoluble, due to the low formation of H Bonds?
No, not intramolecular forces... intermolecular forces between the monomers are "greater", making it insoluble.
They are soluble at certain conditions (under very high pressure and temperature), but GENERALLY are insoluble.
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Cellulose is insoluble in water because of its tightly packed structure.
I think the other two are soluble, though gylcogen moreso than starch.
Generally, polysaccharides are insoluble. Think about it: they are HUGE molecules made up of glucose monomers. They're ability to form hydrogen bonds with water is low, because of their size, and so are insoluble.
They are, however, polar.
So the Intramolecular forces are GREATER, then the strength of the Hydrogen bonding?
Meaning its insoluble, due to the low formation of H Bonds?
No, not intramolecular forces... intermolecular forces between the monomers are "greater", making it insoluble.
They are soluble at certain conditions (under very high pressure and temperature), but GENERALLY are insoluble.
Ahhhhhh!
Yep, Inter = between.
Yeah, thanks I get that clear :)
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Ah, I was thinking that they would be hydrolised and thus split into smaller molecules(maltose), making it soluble. But I suppose this is not glycogen or starch anymore...
Yep, I agree that they are not soluble.
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The way I think of it is that you have a certain amount of O-H bonds in a monosaccahride.
Each time you bond you lose 2.
Eventually all those other little O-H will be insiginificant.
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No, these polymers are still very polar.
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Proportionally increasing sure, it will be pretty big though so the forces would be like nah im not splitting
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As wiki says "They may be amorphous or even insoluble in water."
Theyre just so dense when they're bigger, like long-chain alkanols.