Login

Welcome, Guest. Please login or register.

March 29, 2024, 12:00:58 am

Author Topic: VCE Chemistry Question Thread  (Read 2313125 times)  Share 

0 Members and 8 Guests are viewing this topic.

JR_StudyEd

  • MOTM: MAY 19
  • Forum Obsessive
  • ***
  • Posts: 379
  • Mental health is #1
  • Respect: +171
Re: VCE Chemistry Question Thread
« Reply #8085 on: August 03, 2019, 10:49:54 am »
0
Two questions:

a) What does it mean by 'systematic name'? Is it the same as saying the IUPAC name?
b) Why does hydrolysis result in the production of a carboxylic acid and an alcohol?
Listens to K-Pop (Twice, Red Velvet, MAMAMOO) and Christmas music all year round.

Jim_Bob

  • Forum Regular
  • **
  • Posts: 84
  • Respect: -1
Re: VCE Chemistry Question Thread
« Reply #8086 on: August 03, 2019, 10:58:02 am »
0
Hey guys,
For my chem poster I am doing electrolysis.
We used different voltages per electrolytic cell to test whether voltage has an impact on the mass deposited on the inert cathode. How would I calculate Faraday's Constant to support this hypothesis if I do not know what the Current (Amps) is
Thanks

Jakeybaby

  • Trendsetter
  • **
  • Posts: 191
  • Grad Year: 2016
  • Respect: +23
Re: VCE Chemistry Question Thread
« Reply #8087 on: August 03, 2019, 03:05:42 pm »
+4
Two questions:

a) What does it mean by 'systematic name'? Is it the same as saying the IUPAC name?
b) Why does hydrolysis result in the production of a carboxylic acid and an alcohol?
For a), the systematic name is just naming the compound based upon functional groups, carbon chain length etc. So yes, the IUPAC name would be the same.

For b) I'm not sure about the content covered in VCE, but you have acidic hydrolysis and basic hydrolysis. In acid hydrolysis, you can think of the water molecule splitting the ester bond, which produces a carboxylic acid and an alcohol.
In basic hydrolysis, the molecule of the basis splits the ester bond, which produces the carboxylate salt and an alcohol.
I don't think that you'll need to know anything else other than the fact that the water molecule splits the ester bond, I could be wrong however as I've never studied VCE.
2016 ATAR: 98.60

2020: Bachelor of Finance @ University of Adelaide

Recipient of the 2017 University of Adelaide Principals' Scholarship

pugs

  • Trendsetter
  • **
  • Posts: 122
  • Respect: +27
Re: VCE Chemistry Question Thread
« Reply #8088 on: August 04, 2019, 05:47:25 pm »
0
hey! just wanted to double check (sry if it's a dumb q), do all carbon nmr spectrums only contain singlets?
thank you!  :)


2019 vce journal here

colline

  • MOTM: NOV 19
  • Forum Obsessive
  • ***
  • Posts: 341
  • ♡ 2 Timothy 1:7 ♡
  • Respect: +512
Re: VCE Chemistry Question Thread
« Reply #8089 on: August 04, 2019, 05:55:11 pm »
+4
hey! just wanted to double check (sry if it's a dumb q), do all carbon nmr spectrums only contain singlets?
thank you!  :)

Yep, there is no splitting in Carbon NMR.

VCE: Literature [50] Methods [50] Further [48] Chemistry [40] Biology [33]
2022: Bachelor of Science (Mathematical Economics) @ ANU

angrybiscuit

  • Trendsetter
  • **
  • Posts: 196
  • Respect: +204
Re: VCE Chemistry Question Thread
« Reply #8090 on: August 05, 2019, 04:12:53 pm »
0
I am having trouble finding experimental design questions (outside VCAA exams). Help would be much appreciated!  :)
somewhere, something incredible is waiting to be known.
carl sagan

Chloe182

  • Adventurer
  • *
  • Posts: 20
  • Respect: +1
Re: VCE Chemistry Question Thread
« Reply #8091 on: August 07, 2019, 07:57:39 pm »
0
I'm currently in year 10 planning to do chemistry next year but pracs give me major anxiety... In year 10 science we only did like two for the semester. Does VCE chemistry involve a lot? It's something I'm willing to Work through but just kind of curious...

Thank you!!
[2020]: 3/4 Psych, 3/4 Music Performance
[2021]: ?

Matthew_Whelan

  • Forum Regular
  • **
  • Posts: 93
  • Respect: +11
Re: VCE Chemistry Question Thread
« Reply #8092 on: August 07, 2019, 08:29:39 pm »
0
I'm currently in year 10 planning to do chemistry next year but pracs give me major anxiety... In year 10 science we only did like two for the semester. Does VCE chemistry involve a lot? It's something I'm willing to Work through but just kind of curious...

Thank you!!

It depends on your class and teacher, my class haven't done many pracs but when we do its pretty chill. I personally find chemistry very doable (unlike physics) and it is easy to get your head around most concepts.
2018: Psychology
2019: English, Methods, Chemistry, Biology, Physics
ATAR: 88.65

Chloe182

  • Adventurer
  • *
  • Posts: 20
  • Respect: +1
Re: VCE Chemistry Question Thread
« Reply #8093 on: August 08, 2019, 10:11:27 am »
0
It depends on your class and teacher, my class haven't done many pracs but when we do its pretty chill. I personally find chemistry very doable (unlike physics) and it is easy to get your head around most concepts.


Thanks so much!
[2020]: 3/4 Psych, 3/4 Music Performance
[2021]: ?

Just another student

  • Forum Obsessive
  • ***
  • Posts: 207
  • Respect: 0
  • School: Not telling
  • School Grad Year: 2019
Re: VCE Chemistry Question Thread
« Reply #8094 on: August 12, 2019, 07:33:53 pm »
+1
Looking for advice for practice exams. So for every topic for chem out teacher gives us every single VCAA Q since 2002 for revision, so I have basically done most VCAA Q's. Is it worth starting from VCAA 2002 for full practice exams? Those who scored high 40's, did u do lots of company papers?

Lear

  • MOTM: JUL 18
  • Part of the furniture
  • *****
  • Posts: 1170
  • Respect: +328
Re: VCE Chemistry Question Thread
« Reply #8095 on: August 12, 2019, 07:44:33 pm »
+3

Looking for advice for practice exams. So for every topic for chem out teacher gives us every single VCAA Q since 2002 for revision, so I have basically done most VCAA Q's. Is it worth starting from VCAA 2002 for full practice exams? Those who scored high 40's, did u do lots of company papers?

Didn’t bother with any company papers unless they were 2018 (even then found them to be of terrible quality).
Predominantly did VCAA questions and indeed did do every single exam from 2002 (only relevant questions ofc).
2018: ATAR: 99.35
Subjects
English: 44
Methods: 43
Further Maths: 50
Chemistry: 46
Legal: 40
2019: Bachelor of Medical Science and Doctor of Medicine @ Monash

rani_b

  • Trendsetter
  • **
  • Posts: 168
  • Respect: +67
Re: VCE Chemistry Question Thread
« Reply #8096 on: August 14, 2019, 06:41:18 pm »
0
Hey guys the below questions are from VCAA 2002:

1). 0.010 mol of chloral hydrate, CCl3CH(OH)2, is dissolved in a pure organic solvent. The resulting solution is made up to one litre exactly. In this solvent, the chloral hydrate dissociates to chloral, CCl3CHO, and water. The chemical reaction for the process is

CCl3CH(OH)2(in solution) CCl3CHO(in solution) + H2O(in solution)

When the reaction has reached equilibrium the concentration of water in the solution is measured to be 0.0020 M.
The equilibrium constant for the reaction at this temperature would be
A. 4.0 × 10–4
B. 5.0 × 10–4
C. 0.20
D. 0.25

The answer is B, and according to the examiner's report: "Students selecting A, made the mistake of omitting to note that, when the 0.010 mol of CCl3CH(OH)2 dissociated to give 0.002 mol of each of two products, then there would be only 0.008 mol of CCl3CH(OH)2 left."

I just don't get why it's 0.008 when it disassociates to give each of the 2 products? Wouldn't you subtract two lots of 0.002?

2). 100 mL of an 0.0100 M aqueous solution of calcium hydroxide will absorb carbon dioxide according to the equation

Ca(OH)2(aq) + 2CO2(g) → Ca(HCO3)2(aq)

The maximum volume, in mL, at STP of CO2 that could be absorbed by the solution is
A. 22.4
B. 44.8
C. 224
D. 448

How do i do this?
2019 ATAR: 99.85

Selling: English [50] & Lit [48] essays! PM for details.

SPQR

  • Adventurer
  • *
  • Posts: 9
  • For the glory of Rome
  • Respect: +1
Re: VCE Chemistry Question Thread
« Reply #8097 on: August 14, 2019, 07:01:12 pm »
+1
Looking for advice for practice exams. So for every topic for chem out teacher gives us every single VCAA Q since 2002 for revision, so I have basically done most VCAA Q's. Is it worth starting from VCAA 2002 for full practice exams? Those who scored high 40's, did u do lots of company papers?
i think company papers are a good place to start bc they usually ask more foundational theory-based questions to test whether you've gotten the basic concepts down, and the calculations are nowhere as hard as vcaa. but yeah, vcaa questions are way better so try to move away from company papers.
2017: Classical Studies (41) | Latin (45)
2018: Classical Greek (39) | Chemistry (46) | Methods (47)
2019: UMEP Chemistry
2020: Literature, Specialist Maths

bacteriophage

  • Adventurer
  • *
  • Posts: 11
  • Respect: +4
Re: VCE Chemistry Question Thread
« Reply #8098 on: August 17, 2019, 02:32:55 pm »
0
For mass spectroscopy, do we need to know how to write the equation which produces the parent molecular ions and base peaks? (something about bombarding electrons?? - it confuses me!) I saw a question on a VCAA 2010 exam, but not sure if it's within the scope of the new study design...?
And if so, could anyone provide an example of how you would write it?
Thanks
2018 : Biology [44]
2019 : English Language; Chemistry; Maths Methods; Indonesian SL

^^^111^^^

  • MOTM: JULY 2019
  • Forum Obsessive
  • ***
  • Posts: 306
  • Respect: +26
Re: VCE Chemistry Question Thread
« Reply #8099 on: August 17, 2019, 02:43:37 pm »
+3
For mass spectroscopy, do we need to know how to write the equation which produces the parent molecular ions and base peaks? (something about bombarding electrons?? - it confuses me!) I saw a question on a VCAA 2010 exam, but not sure if it's within the scope of the new study design...?
And if so, could anyone provide an example of how you would write it?
Thanks
I am not too sure, but you most likely should - I'll quote what it states : "the principles and applications of mass spectroscopy (excluding features of instrumentation and operation) and
interpretation of qualitative and quantitative data, including identification of molecular ion peak, determination
of molecular mass and identification of simple fragments". So I guess you could say yes.