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September 17, 2019, 08:18:15 am

Author Topic: VCE Chemistry Question Thread  (Read 930650 times)  Share 

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psyxwar

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VCE Chemistry Question Thread
« on: November 18, 2013, 05:43:57 pm »
+10
VCE CHEMISTRY Q&A THREAD

To go straight to posts from 2018, click here.

What is this thread for?
If you have general questions about the VCE Chemistry course or how to improve in certain areas, this is the place to ask! 👌


Who can/will answer questions?
Everyone is welcome to contribute; even if you're unsure of yourself, providing different perspectives is incredibly valuable.

Please don't be dissuaded by the fact that you haven't finished Year 12, or didn't score as highly as others, or your advice contradicts something else you've seen on this thread, or whatever; none of this disqualifies you from helping others. And if you're worried you do have some sort of misconception, put it out there and someone else can clarify and modify your understanding! 

There'll be a whole bunch of other high-scoring students with their own wealths of wisdom to share with you, including TuteSmart tutors! So you may even get multiple answers from different people offering their insights - very cool.


To ask a question or make a post, you will first need an ATAR Notes account. You probably already have one, but if you don't, it takes about four seconds to sign up - and completely free!


OTHER CHEMISTRY RESOURCES

Original post.
Post all your chemistry questions here :) Please help each other out - that's how you all improve! Many high achieving past students will also be floating around to help you out.

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IMPORTANT: In order to ask a question, you will have to click here and make an ATAR Notes account.
« Last Edit: February 16, 2018, 03:19:04 pm by Joseph41 »

psyxwar

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Re: VCE Chemistry Question Thread
« Reply #1 on: November 18, 2013, 05:44:43 pm »
0
Anyway, what is the best way to learn the different analysis techniques? For example, mass spec. Should I aim to develop a deep understanding of the process, or is that a waste of time?

Stick

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Re: VCE Chemistry Question Thread
« Reply #2 on: November 18, 2013, 06:08:47 pm »
+9
inb4"trendsetting 2013ers" comments.

No, "trendsetting 2013ers" is getting old and daft now. Why not this instead?



That's where it is now.
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Scooby

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Re: VCE Chemistry Question Thread
« Reply #3 on: November 18, 2013, 06:19:19 pm »
+4
Anyway, what is the best way to learn the different analysis techniques? For example, mass spec. Should I aim to develop a deep understanding of the process, or is that a waste of time?

Waste of time. It's important that you're able to interpret the results, but as for understanding the techniques themselves, you'll get by with a pretty basic level of knowledge
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DJA

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Re: VCE Chemistry Question Thread
« Reply #4 on: November 18, 2013, 06:37:30 pm »
0
Alright, considering some of us will have started/ be starting the coursework around now

I am still embroiled in 1/2 exams. Arghh…..

Nevertheless, I am looking forward to Chemistry next year. It’s been a really fun subject this year. Anyone doing uni chem in '14?
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clıppy

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Re: VCE Chemistry Question Thread
« Reply #5 on: November 18, 2013, 06:43:16 pm »
+5
Look at that, I might actually be able to help here next year. Unless of course nliu is still around, I can't compete with that.
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psyxwar

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Re: VCE Chemistry Question Thread
« Reply #6 on: November 18, 2013, 06:44:18 pm »
+1
I am still embroiled in 1/2 exams. Arghh…..

Nevertheless, I am looking forward to Chemistry next year. It’s been a really fun subject this year. Anyone doing uni chem in '14?
Yeah me too :P

And yes, I'm doing MUEP, hopefully at Scotch! Looking forward to meeting Chris Commons :D

DJA

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Re: VCE Chemistry Question Thread
« Reply #7 on: November 18, 2013, 07:05:25 pm »
+1
Yeah me too :P

And yes, I'm doing MUEP, hopefully at Scotch! Looking forward to meeting Chris Commons :D

Really??

Sweet! I’m doing uni chem too so I’ll probably get to meet you in person next year. Chris Commons is an absolutely stellar bloke! I’m sure we will have an awesome class. My friends who are doing uni chem are genii at chem-very smart guys.
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Yacoubb

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Re: VCE Chemistry Question Thread
« Reply #8 on: November 18, 2013, 07:26:31 pm »
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Should I spend the summer reading over area of study one of unit 3?? I'm probably going to spend a bit of time going over 1/2 content relevant to 3/4 chem.

clıppy

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Re: VCE Chemistry Question Thread
« Reply #9 on: November 18, 2013, 07:47:17 pm »
+2
Should I spend the summer reading over area of study one of unit 3?? I'm probably going to spend a bit of time going over 1/2 content relevant to 3/4 chem.
The way it went at my school the only assumed things were knowing how to find mols, particles, concentration and using PV=nRT. Almost everything else that was needed we went through again.
If you feel like you're not confident with those things (and possibly redox too) you could revise them, but from a personal standpoint, I see no reason to revise much of 1/2.
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lzxnl

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Re: VCE Chemistry Question Thread
« Reply #10 on: November 18, 2013, 08:02:06 pm »
+3
OK.
Personally, what I found was needed from 1/2 chemistry in 3/4:
Organic nomenclature
Really simple acid-base stuff
Redox reactions
Gases, concentrations and stoichiometry
Maybe solubility? Not too important in 3/4


As you can see, there's not too much that you DO need to know from 1/2

Anyway, what is the best way to learn the different analysis techniques? For example, mass spec. Should I aim to develop a deep understanding of the process, or is that a waste of time?

Personally, the way I learnt them was that I kept reading them until I could explain them to myself and that it made sense. A deep understanding isn't really needed; perhaps just learn what's in the textbook. I've found that's more than enough.

Look at that, I might actually be able to help here next year. Unless of course nliu is still around, I can't compete with that.

Hey, with that attitude, you really won't be able to help :P

Should I spend the summer reading over area of study one of unit 3?? I'm probably going to spend a bit of time going over 1/2 content relevant to 3/4 chem.

What I did in the holidays was that I read through the entire textbook and noted what I found easy and what wasn't so easy. For me, generally it was ok, aside from fractional distillation (like, the exact mechanisms at play, and guess what happened to this part of the course?), analytical techniques and biomolecules (I just hated biology in year 10). I did enough reading to have an idea of what they were, but maybe not a particularly in-depth knowledge. By the time class time came to look over those things, I had seen them before, I had thought about them, and remembering that stuff became easy.
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Penguuu

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Re: VCE Chemistry Question Thread
« Reply #11 on: December 28, 2013, 11:45:39 am »
+1

Please help!  :) (this thread kind of died, not sure where to post haha)
A solution of potassium permanganate can be standardised using pure iron wire. in a particular experiment 0.317 g of iron wire was dissolved such that Fe2+ ions were formed, and the resulting solution was made up to 250.0 mL.
20ml aliquots of this solution were then taken, with 11.72ml of the permanganate solution being required.
calculate the molarity of the permanganate solution.

DJA

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Re: VCE Chemistry Question Thread
« Reply #12 on: December 28, 2013, 12:21:49 pm »
+2
Please help!  :) (this thread kind of died, not sure where to post haha)
A solution of potassium permanganate can be standardised using pure iron wire. in a particular experiment 0.317 g of iron wire was dissolved such that Fe2+ ions were formed, and the resulting solution was made up to 250.0 mL.
20ml aliquots of this solution were then taken, with 11.72ml of the permanganate solution being required.
calculate the molarity of the permanganate solution.

So a Volumetric analysis question:
Step 1: Redox reaction check lzxnl's post above

Looking at the question lets convert everything to moles first as it is easier!
n(Fe2+)= 0.317/55.8 = 0.005681mol total in 250.0 mL of solution.

Thus in a 20mL aliquot, we use a down-scaling factor to find out the amount of Fe2+ in 20 mL
ie. n(Fe2+) in a 20mL aliquot = 20/250 x 0.005681 = 0.0004545 mol

Now remember the mole ratio worked out earlier, we can see that we need 2 times more MnO4- than Fe2+ for the reaction to go to completion (the 1:5 ratio).
Thus we can conclude:
n(MnO4-) required = 5 x n(Fe2+)
                                   = 1/5 x 0.0004545 = 9.09*10-5 mol

Now to find the concentration of the permanganate solution. We know that 11.72mL of the solution reacted to completion with the Fe2+ solution. We also know the mol which reacted from our working so far. So we are left with an arbitrary calculation:
C(permanganate solution) = 9.09*10-5/0.01172 = 7.76M*10-3

The concentration of the permaganate solution is 7.76M*10-3 rounded to 3 sf.

Cheers lzxnl for checking.
« Last Edit: December 28, 2013, 04:03:26 pm by DJALogical »
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Penguuu

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Re: VCE Chemistry Question Thread
« Reply #13 on: December 28, 2013, 01:08:02 pm »
0
Thanks DJALogical, unfortunately I dont have the solutions, but it looks right.
Ive always been confused with the 'down scaling', didnt know you could do that!
Thank you very much :)
« Last Edit: December 28, 2013, 03:05:27 pm by Penguuu »

DJA

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Re: VCE Chemistry Question Thread
« Reply #14 on: December 28, 2013, 03:14:58 pm »
0
Thanks DJALogical, unfortunately I dont have the solutions, but it looks right.
Ive always been confused with the 'down scaling', didnt know you could do that!
Thank you very much :)

You're welcome!

On a side note: Should this question forum be stickied for ease of access (like in bio for example)? Mod anyone? :D
2014 - English (50, Premier's Award)| Music Performance (50, Premier's Award) | Literature (46~47) | Biology (47) | Chemistry (41) |  MUEP Chemistry (+4.5)  ATAR: 99.70

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