ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: KBT on June 05, 2010, 07:54:48 pm
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Hey VCE Chemistry Class of '10,
Just letting you guys know about a free complementary trial exam available at www.kbtlectures.com. Just click on services and download the pdf! Don't forget to submit any feedback via the 'Contact Us' section.
Quick note: This exam is designed to be harder than the real thing. That is because we're trying to prepare you for some of the tougher questions they can give you so that you aren't completely surprised if the actual exam is hard. You also tend to learn more from challenging questions than you do from straightforward ones.
Update: It's Sunday morning, and as promised the solutions have been released.
Enjoy and good luck.
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I'll look onto this.
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LOL my heart skipped a beat when i saw the front cover 2010
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Thank you :D
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LOL my heart skipped a beat when i saw the front cover 2010
Haha. In hindsight, we needn't have put the date and everything in the front cover. Rest assured, this paper is not *the* paper :P
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LOL my heart skipped a beat when i saw the front cover 2010
Haha, I understand how you feel. ;D
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Haha. In hindsight, we needn't have put the date and everything in the front cover. Rest assured, this paper is not *the* paper :P
That's too bad. I was actually about to do it.
jk :)
*edit: btw thanks heaps. looks like an interesting exam; good conceptual understanding questions.
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WOW YOU GUYS ARE SO PRO ALL 99.95 WTFLA.
except for the last guy he cheated with latin..lol
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Is it possible if we can have the solutions?
Souljette
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Shall be put up on the website tomorrow...I'll put another post here when they're up as well though
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Can't wait for solutions :)
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Anyone done it? Is it worth doing?
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LOL my heart skipped a beat when i saw the front cover 2010
lol, I was thinking you and stonecold, broke into your schools or the VCAA office (as you were planning) ...
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LOL my heart skipped a beat when i saw the front cover 2010
hahaha!
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Anyone done it? Is it worth doing?
Definetly worth doing. Engaging questions, with some challenges here and there.
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Anyone done it? Is it worth doing?
Definetly worth doing. Engaging questions, with some challenges here and there.
Its alright.. I felt some questions were a bit irrelevant to our course though. THere are some challenging questions
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Anyone done it? Is it worth doing?
Definetly worth doing. Engaging questions, with some challenges here and there.
Its alright.. I felt some questions were a bit irrelevant to our course though. THere are some challenging questions
True, but thats good from linking up ideas :P
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oooo awesome thanks, i may check it out! there seems to be a few spectro/chromo questions as i just flicked through which are good cos of the likeliness of bigger questions this year on these.
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Questions I felt were irrelevant:
MC Q1. Electrical conduction thingy was more unit1/2 and unit 4
SA Q1a - I dont even understand the question, I could be just dumb though but I could understand all the VCAA and trial exam questions.
SA2b whats amu? its not even in the databook
However these was the questions I felt were well written
Question 2c and d
Q3d
5b
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^ yeah, i looked at question 1 and saw that electrical conduction stuff, and was like, we haven't learnt this. ceebs!
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Nice exam. Some MC are just o.0 but the rest seems quite decent.
AMU is atomic mass units, it is the units of mass of *one* molecule. Each unit represents the mass of one proton/neutron/H+.
Ionic compounds do not have a molecular formula as they form a lattice, and the extent to which this forms varies. So there is no molecular formula, only an empirical formula, which identifies the ratio in which elements are present in the lattice. (I think...)
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Questions I felt were irrelevant:
MC Q1. Electrical conduction thingy was more unit1/2 and unit 4
SA Q1a - I dont even understand the question, I could be just dumb though but I could understand all the VCAA and trial exam questions.
SA2b whats amu? its not even in the databook
Thanks for that. We appreciate any and all feedback. Most of those concerns will be addressed in the solutions released tomorrow. In regards to question SA2b, amu stands for atomic mass units. Using amu wasn't meant to be a 'trick' or anything, that's just the unit in which molecular weight is measured by. It is equivalent to molar mass in the sense that a molecule with a molecular weight of 332.0 amu has a molar mass of 332.0 g/mol. Sorry for the confusion there.
Sorry about Q1 being a bit tougher in that you have to remember the relation between ionization and electrical conduction - please don't let that detract you from trying out the rest of the paper! ;)
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With multiple choice question 1 the wording is confusing. I assume when you refer to "these" you are talking about the options given? Because when I first read it I thought you were talking about the conjugate of the conjugate...
The Lowry-BrØnsted acid-base conjugates for the following species were isolated and dissolved in
pure water. Which of these would produce the conjugate base with the greatest electrical conductivity
when it ionises in water?
Are you asking which of the options has the conjugate base with the greatest electrical conductivity?
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I'll try it once the solutions come out. :)
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On a side note, is it just me or does KBT kind of remind you BTK, the mass murderer guy in the USA?
http://en.wikipedia.org/wiki/Dennis_Rader
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With multiple choice question 1 the wording is confusing. I assume when you refer to "these" you are talking about the options given? Because when I first read it I thought you were talking about the conjugate of the conjugate...
The Lowry-BrØnsted acid-base conjugates for the following species were isolated and dissolved in
pure water. Which of these would produce the conjugate base with the greatest electrical conductivity
when it ionises in water?
Are you asking which of the options has the conjugate base with the greatest electrical conductivity?
yep
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Solutions?
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lol. eager.
I'm not going to bed till they're posted.
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78 marks, 6 short answer? a reflection of marking scheme for wednesday?
lets hope so.
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http://www.vcaa.vic.edu.au/vcaa/vce/exams/examcovers/June_2010_covers/2010chem1-cover.pdf
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Electrical conductivity asked in that manner is fair game. In a nutshell, the more ions you have the more conductive it is. Thus the question is really asking about the degrees of ionisation of acids and bases (i.e. strength of acids and bases)
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Electrical conductivity asked in that manner is fair game. In a nutshell, the more ions you have the more conductive it is. Thus the question is really asking about the degrees of ionisation of acids and bases (i.e. strength of acids and bases)
They can assess anything from unit 1 and 2 I guess, but I highly doubt they would waste a question on that. They rather use it for unit 4.
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http://www.vcaa.vic.edu.au/vcaa/vce/exams/examcovers/June_2010_covers/2010chem1-cover.pdf
Sample: Number of questions and marks allocated may vary from the information indicated
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Solutions are now out
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http://www.vcaa.vic.edu.au/vcaa/vce/exams/examcovers/June_2010_covers/2010chem1-cover.pdf
Sample: Number of questions and marks allocated may vary from the information indicated
Yeah, that's their way out if they have to change it for whatever reason. HIGHLY unlikely though I'd say.
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5. B
Considering that this is a hydrated sample of barium chloride, the remaining percentage by mass
of the compound must be water. Therefore the percentage of water in the compound is:
100 – 52.34 – 27.07 = 20.59
From here, conventional empirical formula calculations can be used.
Species: Ba Cl H2O
Mass: 52.34 27.07 20.59
M: 137.3 35.5 18
Mol: 0.3812090 0.762535 1.14388
Ratio: 1 2 3
Therefore, BaCl2.3H2O
BaCl2.3H2O is option D or am I missing something
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5. B
Considering that this is a hydrated sample of barium chloride, the remaining percentage by mass
of the compound must be water. Therefore the percentage of water in the compound is:
100 – 52.34 – 27.07 = 20.59
From here, conventional empirical formula calculations can be used.
Species: Ba Cl H2O
Mass: 52.34 27.07 20.59
M: 137.3 35.5 18
Mol: 0.3812090 0.762535 1.14388
Ratio: 1 2 3
Therefore, BaCl2.3H2O
BaCl2.3H2O is option D or am I missing something
You're correct XD
Hopefully most people find that self-evident on reading the solution
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Wow, That was very hard! A good challenge though, I got about 80% of it out which I'm happy with.
Also learnt some new things!
Thank you very much
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Excellent exam, hope VCAA one isn't like this =]
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Ok just did it.
Cool exam and very nice effort on solutions =)
Its a bit dodgy though in that it's not really clear what some of the short answer explanation question are asking for.
And sif drawing the deoxyribotrinucleotide molecule is 3 marks >.<.
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Also with the solutions for the deoxyribotrinucleotide molecule, aren't the nitrogenous bases meant to be flipped around (horizontally) so that they are "open" to undergo complementary base pairing?
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Yeah, I just gave up on that question. I drew one of them the right way and all, but then when we had to flip adenine I was like F**k this....it is never going to come up in the exam.
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WTF the data book is so crap for the drawing of nucleotides...........................
the pyrimidines you have to rotate so many times.....................
ACTUALLY lol you don't have to rotate them at all >.<
Purines though...................... you need to just flip.
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Also, the top phosphate group in the same nucleotide as C. It has an OH and O- group, not 2 O- groups.
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I really liked the first extended response question. I did feel that question 8 in the multiple choice was beyond the knowledge of the course - I don't know if we're supposed to know when different things decompose. It was definitely more difficult and probing than other trials, so congratulations on the good work :) Tbh, the first extended response reminded me a bit of the Chemistry NQE... although obviously tailored to fit within the bounds of the VCE course...
How did everyone go on it, btw?
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I think the answers to Q5 & 6 of MC have been flipped
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yeh i think so too
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Hopefully most people find that self-evident on reading the solution
confused me for a sec, I was so sure I was right so I read through the solutions and yes they made a mistake.
There are a few errors in the answers, Q3c is about 1-pentamine, but they discuss 1-octamine in the answers