-
(https://i.imgur.com/4RUzOBi.png)
Post all exam discussion, questions, and sample solutions here! To make a post, you will have to be logged in. If you don't yet have an ATAR Notes account, you can register here.
-
Seemed like a similar difficulty to other years.
-
Seemed like a similar difficulty to other years.
How was it in terms of length?
-
How was it in terms of length?
It seemed a bit longer than last years but nothing to significant.
-
For question 9, what did u guys get for current efficiency?
-
Wish I could have done that exam with as high efficiency as I calculated the electrolysis to have... ended up with 300something% and didn’t get time at the end to go back and see what I did wrong. Agh. Very angry at myself for that. The rest of it was quite hard but I think I got most of it.
-
For question 9, what did u guys get for current efficiency?
90-something %.
Exam for me definitely felt longer. Was mostly manageable but that last question took me like 20-30mins to finish writing, leaving me with no time to check rip
-
More difficult than 2017 i believe
-
Thought this year was significantly more difficult than previous years
-
Could anyone please upload an extra copy of the exam. They didnt let us take an extra copy at my school. (sols would be even better.)
Thank you very much
-
sooo pushed for timee
-
What's the A+ gonna be? Any predictions?
-
Felt quite long even though it was 1 page longer than last year's. The experimental question (electrolysis) was quite interesting but overall it felt more difficult compared to past years or maybe it's because I didn't prepare enough :^(
-
that was so hard
-
Felt quite long even though it was 1 page longer than last year's. The experimental question (electrolysis) was quite interesting but overall it felt more difficult compared to past years or maybe it's because I didn't prepare enough :^(
It did feel more difficult than previous years especially cause it was long and some questions were there to trip you up.
-
Is it possible for anyone to post up the solutions like the methods section?
Thanks in advance
-
What's the A+ gonna be? Any predictions?
Last year you needed 97/120... if everyone found it hard fingers cross it's lower to around 95/120
-
Really hoping its around 93/120
-
90-something %.
Exam for me definitely felt longer. Was mostly manageable but that last question took me like 20-30mins to finish writing, leaving me with no time to check rip
Yeah I got 90% something as well.
What did you guys do for whether the results were accurate? I said it wasn't because it wasn't concordant but I doubt that's right haha
-
Yo is precision susceptible to bias? There was an MCQ with that as an answer and I had to guess that question because it felt like two options were right
-
I said repeating experiments reduces the likelihood of random error
-
I said repeating experiments reduces the likelihood of random error
You're right, but I think it said uncertainty not random error, which I don't think is reduced as it would be consistent in every trial. Correct me if I'm wrong though and it said random error.
-
Guysss I have a really important question,
How many marks was the last question
After the experimental design?
-
What did everyone's concentration time graph look like, what increased and dropped?
-
Guysss I have a really important question,
How many marks was the last question
After the experimental design?
It was 9 marks 😬 didn’t finish
-
You're right, but I think it said uncertainty not random error, which I don't think is reduced as it would be consistent in every trial. Correct me if I'm wrong though and it said random error.
What was ur answer?
-
You're right, but I think it said uncertainty not random error, which I don't think is reduced as it would be consistent in every trial. Correct me if I'm wrong though and it said random error.
What was ur answer?
I chose the 'precise results can be biased' option - not that I know its right. My line of thought was that since precision only refers to how close your measured results are, it doesn't matter if you rigged the experiment because even though the data is not reliable or valid, as long as the results are close together it would still be precise.
-
Did most people struggle finishing? I'm kicking myself because I spent too much time on short answer and completely neglected MC until the last 10 minutes, and had to guess most of it - I'm so annoyed because the questions were what I was comfortable with asking and I basically threw away marks for myself :(
-
What did everyone's concentration time graph look like, what increased and dropped?
Cl- concentration sharply decreased, and as it reached equilibrium Co2+ went up by 1x Cl- went up by 4x, [CoCl4]2- went down by 1x
-
Did most people struggle finishing? I'm kicking myself because I spent too much time on short answer and completely neglected MC until the last 10 minutes, and had to guess most of it - I'm so annoyed because the questions were what I was comfortable with asking and I basically threw away marks for myself :(
opposite problem here, spent so much time in MC that i had to either leave blank or guess q7, 8 and 9 despite most of them being pretty free.
-
exam was most definitely longer than previous years though.I could usually finish most exams with 20-30 mins left but this one i had about 20-25 marks completely unanswered before time ran out
-
Could anyone tell me if I’m right:
For the concentration time graph we had to draw, I drew all species as decreasing in concentration. My reasoning was that since AgNO3 was added, it would dissociate into Ag+ and NO3- and the NO3- ions would react with the CoCl4+ (or whatever it was) and Co2+, while the Ag+ ions would react with the Cl-, thus drecreasing the concentration of all species.
-
Could anyone tell me if I’m right:
For the concentration time graph we had to draw, I drew all species as decreasing in concentration. My reasoning was that since AgNO3 was added, it would dissociate into Ag+ and NO3- and the NO3- ions would react with the CoCl4+ (or whatever it was) and Co2+, while the Ag+ ions would react with the Cl-, thus drecreasing the concentration of all species.
There was a similar question like this on the NHT 2019 exam question 7. According to the examination report, only the concentration of Cl^-1 is reduced when AgNO3 is added to the equilibrium system. The NO3- does not make any difference as they do not say it reacts with the other positive ion. Please refer the NHT examination report for complete details.
-
Anyone have solutions to multiple choice?
-
Cl- concentration sharply decreased, and as it reached equilibrium Co2+ went up by 1x Cl- went up by 4x, [CoCl4]2- went down by 1x
That's what I did, however, shouldn't all decrease as you are adding a compound that sort of acts like an inert compound so should all go down and then increase.
-
There was a similar question like this on the NHT 2019 exam question 7. According to the examination report, only the concentration of Cl^-1 is reduced when AgNO3 is added to the equilibrium system. The NO3- does not make any difference as they do not say it reacts with the other positive ion. Please refer the NHT examination report for complete details.
But if it reacts with Cl then should its concentration decrease and then increase as the system establishes equilibrium?
-
That's what I did, however, shouldn't all decrease as you are adding a compound that sort of acts like an inert compound so should all go down and then increase.
No only concentration of Cl- reduces. This was similar to the question in 2019 NHT. It’s question 7. Please do refer examination report. In both questions, there is a positive ion. I am pretty sure both don’t react.
-
But if it reacts with Cl then should its concentration decrease and then increase as the system establishes equilibrium?
Yes
-
No only concentration of Cl- reduces. This was similar to the question in 2019 NHT. It’s question 7. Please do refer examination report. In both questions, there is a positive ion. I am pretty sure both don’t react.
Yeah but if [Cl-] reduces, then also the [[CoCl4]2+] would decrease since the reaction would move forward due to the reduced product concentration.
-
Not that it really matters now but I thought adding an inert molecule would increase the pressure of the system which would favour the reaction that produces less moles.
-
What was the answer to the fuel blend question? It asked how much energy was released
-
What was the answer to the fuel blend question? It asked how much energy was released
I got something like 3400kj. Not sure if its right but I think I did the calculations correctly.
Anyone know what they got for the grams of sucrose in the soda can?
-
Not that it really matters now but I thought adding an inert molecule would increase the pressure of the system which would favour the reaction that produces less moles.
Inert molecule never does anything, it does increase the pressure of the system so there are more collisions but it doesn't react so the collisions aren't successful.
-
Has anyone got solutions yet??
-
I got : D A D. D B. B C B B C A D A A C(?) D B D. C D D A B A. A C B B C B
Happy to debate
-
If someone can upload the exam paper....that would be great
-
If someone can upload the exam paper....that would be great
Hey,
Unfortunately we can't upload exam papers to AN until after they're released by VCAA because they're copyrighted.
-
Has anyone got any solutions? (For this year's exam)
Also, are there any A+ cutoff predictions?
-
I got : D A D. D B. B C B B C A D A A C(?) D B D. C D D A B A. A C B B C B
Happy to debate
are the full stops meant to mean anything or just separators?
i got
C A D. D B. B C A B C A D A A C D D
so approx 3 differences, thats all i could copy down before they took my paper away
do you remember what any of them actually were about?
-
Anyone have solutions for short answer?
-
I'm guessing around 82-83%
It couldn’t be higher than 2018?
-
It couldn’t be higher than 2018?
surely it'd go down? Like similar (hopefully lower that) 2017?