ATAR Notes: Forum
Archived Discussion => Mathematics/Science/Technology => 2015 Exam Discussion => Chemistry => Topic started by: thushan on November 10, 2015, 11:33:34 am
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How was the paper?
Also, if someone has the paper, can they please have it scanned and uploaded onto the below thread on this board - I can start writing up answers.
VCE Chemistry 3/4 Examination 2015 - Exam Copy (Not uploaded yet!)
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Found it ridiculously easy which is surprising considering I was aiming for a raw 12
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I thought the paper was quite accessible for most students. There were not any very difficult questions and there were many 'gimme' marks available. There were some relatively difficult multiple choice questions this year and the short answer section was, in my opinion, easier. Overall I think the A+ cutoff will be pretty high and you would only be able to obtain a 50 with a few marks lost maximum.
I'm currently scanning my copy of the exam so I'll send it over asap.
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That was really easy, I'm certainly no A+ student so that is saying something. I say you would have to drop less than 10 marks for an A+
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That's a tad disappointing that it was easy. I was honestly expecting the difficulty to be similar to last year.
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for the fuel cell question, was it water for the exhaust?
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Yeah, I can't describe how easy it was, and this is coming from a kid who did 3 practice exams...
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Yh gotta agree. It was pretty straight forward. Methinks A+ is gonna be suppppper high
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Was it similar in difficulty to the 2013 exam, because that was one pretty easy too??
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Was it similar in difficulty to the 2013 exam, because that was one pretty easy too??
easier, just check the grade distributions for 2013, you could drop 18 marks and get an A+. I think you could only drop like 5-7 marks of this one
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Was it similar in difficulty to the 2013 exam, because that was one pretty easy too??
Way easier I reckon, so many piss easy 1-2 markers
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Damn. It really must have been crazy easy then.
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easier, just check the grade distributions for 2013, you could drop 18 marks and get an A+. I think you could only drop like 5-7 marks of this one
That'd be a little unrealistic; even in 2013 when the paper was reasonably easier, a 102/120 gave you an A+ yes, and I know someone who got 114.5/120 and got a 50.
I haven't seen the paper yet, but I'll be surprised if the A+ cut was above 108/120.
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Then again, this (a really straightforward exam) probably means they'll crack down on worded answers/explanations..
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Then again, this (a really straightforward exam) probably means they'll crack down on worded answers/explanations..
Yeah not keen for that, but even then the worded questions were pretty straightforward. No real deep thinking required, a lot of it was almost recall
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Well I know I lost at least few marks from stupid mistakes... goodbye 45+
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Well I know I lost at least few marks from stupid mistakes... goodbye 45+
Are answers up? And don't count 45 out yet! you only know when the scores come out :)
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Are answers up? And don't count 45 out yet! you only know when the scores come out :)
I think Thushan's currently writing solutions for the scanned copy I sent to him
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Was hoping for 45+ too. Messed up the first few marks.... :((( Do you guys think the cut off for A+ will be exremely high ? I saw there was a paper once with a 92% cutoff... Dear god i hope that doesnt happen this year. What study score do you think i can get with 115/120 exam, rank 1 97/100 SACs
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I think Thushan's currently writing solutions for the scanned copy I sent to him
Any chance you can post the exam on here too, please?
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Then again, this (a really straightforward exam) probably means they'll crack down on worded answers/explanations..
I'm kind of worried now, does this mean that they'd be looking for specific words that you had to include in your answer?
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Any chance you can post the exam on here too, please?
I can post it but the order of pages is messed up - it's in the form of two pdf files with every 2nd page
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I can post it but the order of pages is messed up - it's in the form of two pdf files with every 2nd page
I'd still like to take a look, if you wouldn't mind. :)
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I'd still like to take a look, if you wouldn't mind. :)
I'll scan a better copy and put it up.
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Same was hoping to get a good score but lost quite a few marks.
For the back titration question about the concentration of ammonia i got in the thousands! Which was definitely wrong and i kept re-doing the question but then couldn't find away to do it! how many marks will i have lost?!
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I'll scan a better copy and put it up.
Aww thanks, man!
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As a guy who got a C+ for unit 1 chem... that exam wasn't even all that bad. Such a relief to be done, and the calculation-based questions were particularly easy by comparison imo.
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Same was hoping to get a good score but lost quite a few marks.
For the back titration question about the concentration of ammonia i got in the thousands! Which was definitely wrong and i kept re-doing the question but then couldn't find away to do it! how many marks will i have lost?!
Don't worry, I think I stuffed that up, everyone was saying how tricky it was. I didn't find it tricky so I obviously stuffed, haha. but you do get consequential marks as far as I know, so don't stress
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Don't worry, I think I stuffed that up, everyone was saying how tricky it was. I didn't find it tricky so I obviously stuffed, haha. but you do get consequential marks as far as I know, so don't stress
A lot of people were saying that they got like 42g or something like that. Ughh well thats a relief. so happy its over
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Same was hoping to get a good score but lost quite a few marks.
For the back titration question about the concentration of ammonia i got in the thousands! Which was definitely wrong and i kept re-doing the question but then couldn't find away to do it! how many marks will i have lost?!
Nearly did it wrong myself too because I didn't notice it said to find the n(HCl) reacted in the titration flask (20mL aliquot). So the initial amount of HCl had to be multiplied by 20/250, then you could subtract the amount of n(Hal) reacted. In the end the concentration I calculated was a little lower than the one that was in the information.
Hopefully I got that right...
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Nearly did it wrong myself too because I didn't notice it said to find the n(HCl) reacted in the titration flask (20mL aliquot). So the initial amount of HCl had to be multiplied by 20/250, then you could subtract the amount of n(Hal) reacted. In the end the concentration I calculated was a little lower than the one that was in the information.
Hopefully I got that right...
yeah i got like 43 or something just under, i was certain i'd fucked up but that reassured me
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for the last back tittation question explaining the error. would i get a mark for say water could have evaporated from the solution (my answer I had like 94g/L) ?
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Here is the exam:
http://bit.ly/1MIaqcr
I will be posting this link in the exam copy thread as well.
Edit: someone beat me to it
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Nearly did it wrong myself too because I didn't notice it said to find the n(HCl) reacted in the titration flask (20mL aliquot). So the initial amount of HCl had to be multiplied by 20/250, then you could subtract the amount of n(Hal) reacted. In the end the concentration I calculated was a little lower than the one that was in the information.
Hopefully I got that right...
Oh crap I think I multiplied the concentration of excess by 250/20, cause molar ratios? This is the same as multiplying the initial by 20/250 right?
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Oh crap I think I multiplied the concentration of excess by 250/20, cause molar ratios? This is the same as multiplying the initial by 20/250 right?
That's what I did too.. I don't even want to think about the exam anymore haha :p
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Looks like many of the things I specifically mentioned to my students came up on the exam, so I'm obviously rather happy about that. :D
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I ended up writing some of the worded responses on the adjacent page (with appropriate linking arrows) and also on the bottom margin, as I made mistakes initially. Just checking that the examiner would be able to read those? (pls pls pls :P) I assumed the entire paper was fair game for writing on except the black strip
Btw the exam was easier than expected - I was bracing myself for 2014
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I ended up writing some of the worded responses on the adjacent page (with appropriate linking arrows) and also on the bottom margin, as I made mistakes initially. Just checking that the examiner would be able to read those? (pls pls pls :P) I assumed the entire paper was fair game for writing on except the black strip
Btw the exam was easier than expected - I was bracing myself for 2014
As long as you indicated (which you did), they will read it- you'll be OK :)
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Was pH = 4.5 for the H2S question?
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Was pH = 4.5 for the H2S question?
I'm pretty sure it is, that was my answer too
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I'm pretty sure it is, that was my answer too
Hmm... what did you write for disadvantages of the hydrogen fuel cell for cars? I wrote that H2 was not readily available and widely distributed as petrol... lol not chemistry but I guess this was where it was heading
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Hmm... what did you write for disadvantages of the hydrogen fuel cell for cars? I wrote that H2 was not readily available and widely distributed as petrol... lol not chemistry but I guess this was where it was heading
For advantage I said it is more efficient than a combustion engine because there are few energy conversions and for disadvantage I said more expensive to operate.
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For advantage I said it is more efficient than a combustion engine because there are few energy conversions and for disadvantage I said more expensive to operate.
Hmmm... do you think my response would be accepted then :/ I saw it on the Heinemann textbook so I thought ... yes
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For disadvantage I wrote hydrogen gas is highly reactive and dangerous in an accident, would this get a mark?
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I'm pretty sure it is, that was my answer too
Yeah, I got 4.5 :)
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Hmmm... do you think my response would be accepted then :/ I saw it on the Heinemann textbook so I thought ... yes
Yep - it is definitely a disadvantage, and if the textbook said it there's no doubt you'll get the marks
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Nearly did it wrong myself too because I didn't notice it said to find the n(HCl) reacted in the titration flask (20mL aliquot). So the initial amount of HCl had to be multiplied by 20/250, then you could subtract the amount of n(Hal) reacted. In the end the concentration I calculated was a little lower than the one that was in the information.
Hopefully I got that right...
Yeah, I just saw that question - terribly worded LOL. What I ended up doing was what you did, by the way.
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So I just did the exam. And I think you guys are overestimating how 'easy' it was.
- A bunch of people will have gotten the back titration question wrong
- I reckon most people won't have figured out the structure of the ester molecule
- People will have gotten wrong the question regarding solutions A and B and whether you could use the calibration graph
- Using collision theory to describe how an equilibrium system responds to a volume change is not exactly easy
- I reckon many people will not have drawn the triglyceride molecule correctly
- People will definitely miss some of the errors in the last question.
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Concur.
An A+ of about 100-102/120.
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Concur.
An A+ of about 100-102/120.
My thoughts exactly :)
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Soo I did most of it in pencil, how much of an issue is it going to be? :-\
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Soo I did most of it in pencil, how much of an issue is it going to be? :-\
Me too. I don't think it matters at all.
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Soo I did most of it in pencil, how much of an issue is it going to be? :-\
hopefully not an issue at all or we're both getting 0 lol
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Me too. I don't think it matters at all.
hopefully not an issue at all or we're both getting 0 lol
Haha thanks guys and yeah hopefully! I was planning on doing diagrams and multi choice in pencil and then everything else in pen but switching took so long so I just thought whatever and did everything else in pencil
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110/120 enough for mid 40's?
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110/120 enough for mid 40's?
I would surely hope so.
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110/120 enough for mid 40's?
I'd say so.
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Would A+ SACs and a 102/120 be a 40? What about a 105/120?
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Would A+ SACs and a 102/120 be a 40? What about a 105/120?
If A+ cutoff is around 100-102 then yeah you'd probably get a 40
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So I think I got about 109/120. I feel awful. There's probably no chance of a 45+ now :/ *cries*
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So I think I got about 109/120. I feel awful. There's probably no chance of a 45+ now :/ *cries*
I'd say you wouldn't be too far off a 45.
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A 114.5/120 got a 50 in the 2013 exam which was considered easy!
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For the PH Question I got 4.5 but I rounded it up to 5, would I lose marks? :/
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For the PH Question I got 4.5 but I rounded it up to 5, would I lose marks? :/
Did you at least write pH = 4.5 = 5? Or did you just write pH = 5?
- If you did the former, then they might not penalise you.
- But they'd definitely take ONE mark off if you just wrote that pH = 5.
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Isn't it to 1 sig fig so ph = 5???
I wrote 4.5 then a line under wrote 5 (1 sig fig)
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Isn't it to 1 sig fig so ph = 5???
I wrote 4.5 then a line under wrote 5 (1 sig fig)
I thought the exact same thing! I wrote pH=4.5
Then the next line under pH=5
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I thought the exact same thing! I wrote pH=4.5
Then the next line under pH=5
Whoa I did this exactly too hahah great minds think alike
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Significant figures for pH doesn't count until after the decimal place so 4.5 is technically 1 SF
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1 Sig fig is actually 4.5 as the 4 just indicated the power of ten it is in (if that makes sense), but they usually only check one question for sig figs, so you should be ok (unless they're going to be especially strict this year- which I doubt cause then people will complain).