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January 27, 2021, 04:53:35 am

Author Topic: HSC Chemistry Question Thread  (Read 648620 times)  Share 

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006896

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Re: HSC Chemistry Question Thread
« Reply #3825 on: June 28, 2020, 01:34:58 pm »
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Hi!
Could someone help me with part b i) and ii) of this question about galvanic cell? part bi and ii are pasted in below, but the question stem is attached.
part b
After a period of time, a solid deposit that had formed on the copper electrode was removed and dried. The deposit had a mass of 0.395 g.
i) Calculate the final mass of the nickel electrode.
ii) Calculate the final concentration of the nickel (II) nitrate solution.

Thank you!

eliza.langer

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Re: HSC Chemistry Question Thread
« Reply #3826 on: November 16, 2020, 08:05:23 pm »
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Hi!

I just started the HSC Chemistry course and we have our first assessment task at which we have to research a gaseous equilibrium system that IS NOT the Haber Process. Does anyone have a really interesting system that I could research?

Thanks!

keltingmeith

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Re: HSC Chemistry Question Thread
« Reply #3827 on: November 16, 2020, 08:24:26 pm »
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Hi!

I just started the HSC Chemistry course and we have our first assessment task at which we have to research a gaseous equilibrium system that IS NOT the Haber Process. Does anyone have a really interesting system that I could research?

Thanks!

Absolutely - Haber sucks anyway, too energy inefficient, too much greenhouse gas by-product.

A very common one is the decomposition of dinitrogen tetroxide, \(\ce{N2O4 (g)\to 2NO2 (g)}\). This one is nice because one of the two is coloured, and the other isn't. I personally prefer the sublimation of iodine, though it might not count because it's not entirely gaseous, \(\ce{I2 (s)\to I_2 (g)}\). Another cool one is the synthesis of some halide acids, of general form, \(\ce{X2 (g) + H2 (g)\to 2HX (g)}\), usually iodine or bromine since chlorine has an equilibrium that highly favours the products, but I can't seem to find videos of those anywhere...
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Dear VCE 3/4 Chemistry students: you do not need to know how to do pH calculations for your exam. That is all.

neha.singh4

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Re: HSC Chemistry Question Thread
« Reply #3828 on: December 03, 2020, 01:13:13 pm »
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Hey guys,
I have recently received my first Chemistry assessment task for Year 12. It requires us to use your understanding of dissolution of ionic compounds in water and Le Chatelierís principle research to remove toxins from native indigenous foods. Although I understand the nature of the task, I'm struggling to find some information on it since it's apart of the new Chemistry syllabus and there is limited resources available.

The topic is 'Indigenous Chemistry'. I'm struggling to:
1) Find a toxic Aboriginal food (except for cycads since we're not allowed to do that)
2) The detoxification process of the food
3) The correlation the food has to solution equilibria, Le Chatelier's principle and dissolution of ionic compounds.

If anyone can provide any sort of information to get the ball rolling for my assessment, I would greatly appreciate it!!!

Bri MT

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Re: HSC Chemistry Question Thread
« Reply #3829 on: December 03, 2020, 01:36:36 pm »
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I recommend looking up Indigenous chemistry with search terms like "seeds" "toxic" and maybe even tools like Morah stones used for food preparation.


species to look at if you stay really stuck
Dioscorea bulbifera, Beilschmiedia bancroftii and Castanospermum australe


I hope this helps!

neha.singh4

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Re: HSC Chemistry Question Thread
« Reply #3830 on: December 11, 2020, 08:45:15 pm »
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I'm kind of stuck on how to write a chemical equation for a toxin found in black beans that is being leached in water:
This is the toxin- C8H15NO4 (Castanospermine)
It should be a reversible reaction.
Also I'm a little unsure as to what states it would be too (eg. gas, liquid, aqueous, solid)