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August 09, 2020, 08:55:35 am

Author Topic: VCE Chemistry Question Thread  (Read 1222042 times)  Share 

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uwuuu

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Re: VCE Chemistry Question Thread
« Reply #8655 on: July 01, 2020, 07:26:51 pm »
+2
I see thank you and could you please explain how i could relate the cottrell equation to increasing surface area of electrodes?

1729

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Re: VCE Chemistry Question Thread
« Reply #8656 on: July 02, 2020, 10:32:30 am »
+5
I see thank you and could you please explain how i could relate the cottrell equation to increasing surface area of electrodes?
If you look at the variables regarding the cottrell equation, it says that the current is proportional to a whole bunch of different factors, if you multiply both sides by time, it instead becomes about charge the more charge you have the more electrons you have available and the things that determine how many electrons you have available are the variables involved in the cottrell equation
area, the diffusion constant (dependent on the thing that's dissolving), and the initial concentration of reducible species
as well as the actual number of electrons involved in the redox.
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jammol7

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Re: VCE Chemistry Question Thread
« Reply #8657 on: July 02, 2020, 11:50:44 am »
+4
Just wanted to clarify, the cottrel equation isn't on the sd right?
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Evolio

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Re: VCE Chemistry Question Thread
« Reply #8658 on: July 02, 2020, 12:15:15 pm »
+5
Yes, it's not on the SD
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keltingmeith

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Re: VCE Chemistry Question Thread
« Reply #8659 on: July 02, 2020, 12:22:34 pm »
+11
I want to make this completely clear:

After doing VCE chemistry, I entered into a science degree where I got a double major in Chemistry. All you need to understand, is that means I did a lot of chemistry. This included second year and third year electrochemistry. I then went on to do honours in physical and synthetic chemistry. I am now doing a PhD in physical chemistry, in which I look at equations all the time. Not just simple equations, either - I constantly use maths involving integrals, differentials, exponents, logarithms, etc., and have even had to learn how to code and use maths to explain my chemistry.

Not only have I never heard of the Cottrel equation, but looking at it made my head hurt. You definitely don't need to know it for VCE.
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jammol7

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Re: VCE Chemistry Question Thread
« Reply #8660 on: July 02, 2020, 12:41:50 pm »
+4
thank goodness. I felt like I was having a brain aneurysm when searching it up.
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1729

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Re: VCE Chemistry Question Thread
« Reply #8661 on: July 02, 2020, 01:12:50 pm »
+4
Apologies everybody! I am pretty unfamiliar with the VCE content. I really only just started on the fourm in hopes to help people academically. And my favourite thing about myself is my spontaneity and ability to lighten up a conversation/help people cheer up or open up when in group situations, and I feel so proud of myself when I help people academically. I just wanted to let you all know wasn't my intentions to dishearten or frighten anybody with the concepts I present in my help. Does anybody have any documents regarding to the content they present in VCE level? This just helps my ability to help people on the fourm, so I am aware as to how far people are in the curriculum and thus what I can expect people to know!!

Again, apolgize for any fear or unfamiliarity I caused!  :)
« Last Edit: July 02, 2020, 01:17:22 pm by 1729 »
What my avatar is
If you are wondering about my avatar, It was inspired by a problem I did which asked me to prove that the graphs of xy = 1 and y^2 = x^2 + 2 intersected at a 90 degree angle. The resulting figure in the middle kinda like a 8-sided square in hyperbolic space. It also resembles the conformal map of the complex square root.
Subjects: EngLang, Lit, Methods, Spesh, Chemistry, Biology, Physics.

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insanipi

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Re: VCE Chemistry Question Thread
« Reply #8662 on: July 02, 2020, 01:21:25 pm »
+6
Does anybody have any documents regarding to the content they present in VCE level?
You can find the 2020 VCAA Study Design and other relevant information here :)
« Last Edit: July 02, 2020, 01:23:01 pm by insanipi »
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Coolgalbornin03Lo

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Re: VCE Chemistry Question Thread
« Reply #8663 on: July 02, 2020, 04:14:32 pm »
+2
Hi guys! I知 a year 12 revising U3 Chem and was wondering to what extent should we know about energy conversions? I came across a checkpoints question which was asking which is the most efficient. Does anyone know the pathway?

I.e thermal覧> mechanical 覧-> electrical?

Or is this more for the galvanic cells topic? (I知 going over fuels atm)

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« Last Edit: July 02, 2020, 07:08:38 pm by Bri MT »
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Evolio

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Re: VCE Chemistry Question Thread
« Reply #8664 on: July 02, 2020, 04:43:36 pm »
+6
Hello!
It would be good if you know the general energy conversions since it specifically states how you need to know energy transformations and the efficiencies of the different fossil fuels in the study design.
I assume you're talking about the energy conversions in relation to coal?
If so, yes you are correct.
Here is the conversions in more detail:
Coal is combusted and heat is released: Chemical energy >>> Thermal energy
Heat released is used to boil water, producing steam: Thermal energy
The steam rises and moves the turbine and it spins: Thermal energy>>> Mechanical energy
The turbine drives the generator, producing electrical energy (electricity): Mechanical energy>>> Electrical energy
At each conversion, energy is lost as heat

« Last Edit: July 02, 2020, 04:59:12 pm by Evolio »
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jammol7

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Re: VCE Chemistry Question Thread
« Reply #8665 on: July 02, 2020, 09:27:41 pm »
+3
Apologies everybody! I am pretty unfamiliar with the VCE content. I really only just started on the fourm in hopes to help people academically. And my favourite thing about myself is my spontaneity and ability to lighten up a conversation/help people cheer up or open up when in group situations, and I feel so proud of myself when I help people academically. I just wanted to let you all know wasn't my intentions to dishearten or frighten anybody with the concepts I present in my help. Does anybody have any documents regarding to the content they present in VCE level? This just helps my ability to help people on the fourm, so I am aware as to how far people are in the curriculum and thus what I can expect people to know!!

Again, apolgize for any fear or unfamiliarity I caused!  :)
No worries mate. I probably should've checked the study design myself before asking. Good on you for getting so far ahead on the content.
VCE 2019-21
2019: Biology [49] Physical Education [43]
2020: Chemistry [ ] Mathematical Methods [ ] Drama [ ]

yumapple

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Re: VCE Chemistry Question Thread
« Reply #8666 on: July 15, 2020, 06:42:22 pm »
0
Hi newcomer here,
I'm having trouble about what types of experiments I should do for Unit 2 Chem. Does anyone have any past experiments relating to water?

Thanks!
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Owlbird83

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Re: VCE Chemistry Question Thread
« Reply #8667 on: July 15, 2020, 09:19:04 pm »
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Hi newcomer here,
I'm having trouble about what types of experiments I should do for Unit 2 Chem. Does anyone have any past experiments relating to water?

Thanks!

For mine I tested the water pH and water hardness from different places (I did suburbs because people in the class collected water from their taps at home), but if that's not a possibility, maybe compare water from rain/bottled/tap/distilled. I can't remember what other people did, but pH and water hardness are easy because of the test strips or the electronic pH device.
(I remember I wanted to test the pH of different fruit juices but I didn't end up doing it).
Hope that helps :)
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keltingmeith

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Re: VCE Chemistry Question Thread
« Reply #8668 on: July 15, 2020, 09:47:24 pm »
+5
Hi newcomer here,
I'm having trouble about what types of experiments I should do for Unit 2 Chem. Does anyone have any past experiments relating to water?

Thanks!

Feel free to get creative! What's a question you always wanted the answer to? Not knowing what you're limited to, here's some random thoughts off the top of my head:

-What can and can't be dissolved by water?
-What happens when you give different types of water to plants?
-How does water vary based on place to place?
-What colour is water?
-How does pH affect solubility?
-How long does it take for water to fill a container at different hardnesses, pH, etc.
-How much water does it take for someone to trip over?

And there can be so many more. What's something, maybe not related to water, that you're really interested in and want to know more about, and how can you include water in that study? Or maybe just something silly you've always wanted to know?
Currently Undertaking: Doctor of Philosophy (PhD) in Supramolecular Photochemistry (things that don't bond but they do and glow pretty colours)

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HYANA

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Re: VCE Chemistry Question Thread
« Reply #8669 on: July 26, 2020, 04:29:44 pm »
0
Hello people, so I just did a little quiz and I don't know how to get the correct answer. Here is the question.

What is the concentration, in mol/L, of a solution that contains 2.00g of silver nitrate, AgNO3, dissolved in 300ml od solution?

The answer was meant to be 0.0392 mol/L but i have no idea how to get to that point. Can someone help? Thanks.