General Thoughts: Chemistry (1 Viewer)

tomdoml

Premium Member
Joined
Jan 25, 2010
Messages
14
Gender
Male
HSC
2011
This. Why specify one but not the other?
My thoughts exactly. If II is not specified, then you have no more reason to assume that it's I than II. They need to give you the charge, valence whatever for transition metals.
 

Hayzazz

Pig Member
Joined
Sep 2, 2009
Messages
345
Location
Sydney
Gender
Male
HSC
2011
I'm sure both will be accepted. It's BOS's fault for not being clear enough.
 
K

khorne

Guest
My thoughts exactly. If II is not specified, then you have no more reason that it's I than II. They need to give you the charge, valence whatever for transition metals.
(I) is not specified, but (II) is, that is why. The lowesr valence state is the one which is not specified generally.
 

tomdoml

Premium Member
Joined
Jan 25, 2010
Messages
14
Gender
Male
HSC
2011
(I) is not specified, but (II) is, that is why. The lowesr valence state is the one which is not specified generally.
Don't think you can assume the valence is I just because I is a smaller number. If they don't provide it there's not much you can do but guess the valence. That said in the absence of a valence provided I can guarantee most people would have picked II since its the most common valence of copper ions (that we've worked with anyway).
 
K

khorne

Guest
Don't think you can assume the valence is I just because I is a smaller number. If they don't provide it there's not much you can do but guess the valence. That said in the absence of a valence provided I can guarantee most people would have picked II since its the most common valence of copper ions (that we've worked with anyway).
does not explain why Ni (II) was used but Cu was not specified. I dare say they'd accept both, but it's still silly.
 

snorelacks

Member
Joined
Aug 6, 2011
Messages
53
Gender
Female
HSC
2011
For those "outline the procedure you would undertake at a school laboratory to test for.." questions, was it necessary to write out a whole experiment (including accuracy, validity etc) or can it be brief explanation?
 
K

khorne

Guest
For those "outline the procedure you would undertake at a school laboratory to test for.." questions, was it necessary to write out a whole experiment (including accuracy, validity etc) or can it be brief explanation?
OUTLINE the PROCEDURE. lol. Come on m8
 

Nympha

Member
Joined
Jan 13, 2010
Messages
74
Location
Sydney
Gender
Female
HSC
2011
For those "outline the procedure you would undertake at a school laboratory to test for.." questions, was it necessary to write out a whole experiment (including accuracy, validity etc) or can it be brief explanation?
I don't think you'd need the whole experiment - it said PROCEDURE to undertake. It was also only 2 marks, so it's doubtful you'd need to have included accuracy/validity to gain full marks.
 

Psychoanalytic

New Member
Joined
May 26, 2011
Messages
29
Gender
Female
HSC
2011
Multiple choice was reasonable. I compared my answers with others and I think I got 18/20 which I'd be very happy with.
My option was Shipwrecks which was relatively easy except for the aluminium tray method of cleaning silver cutlery question. I'll be lucky if i get 2/4 for that question. Very lucky.

Short answer I'm unsure of how I did.The calculations I thought were quite difficult especially the titration calculations. I forgot that the acid was triprotic etc.
There was a lot about water quality testing which i wasn't expecting, but thankfully, i learnt my shit.

In the equilibrium question, was the third step in equilibrium or not? I do not remember :S and i wrote about it as if it were in equilibrium. The other two steps I believe I wrote the right thing, talking about pressure, compromised temperature and the removal of products etc.

I'm really hoping I got about 80 -90 raw.
I think I lost 2 (maybe 3) marks in MC, 2 - 4 marks option, 2 marks in equilibrium question and 2 - 3 marks calculations. The rest I think went well in.
 

Carl5

Member
Joined
Nov 7, 2009
Messages
153
Gender
Male
HSC
2011
For the question about why add barium sulfate, I said that it would turn the solution to a whitish colour and make it easier to see the colour changes in the indicator. Is that even remotely correct?
 

lolcakes52

Member
Joined
Oct 31, 2011
Messages
286
Gender
Undisclosed
HSC
2012
Multiple choice was reasonable. I compared my answers with others and I think I got 18/20 which I'd be very happy with.
My option was Shipwrecks which was relatively easy except for the aluminium tray method of cleaning silver cutlery question. I'll be lucky if i get 2/4 for that question. Very lucky.

Short answer I'm unsure of how I did.The calculations I thought were quite difficult especially the titration calculations. I forgot that the acid was triprotic etc.
There was a lot about water quality testing which i wasn't expecting, but thankfully, i learnt my shit.

In the equilibrium question, was the third step in equilibrium or not? I do not remember :S and i wrote about it as if it were in equilibrium. The other two steps I believe I wrote the right thing, talking about pressure, compromised temperature and the removal of products etc.

I'm really hoping I got about 80 -90 raw.
I think I lost 2 (maybe 3) marks in MC, 2 - 4 marks option, 2 marks in equilibrium question and 2 - 3 marks calculations. The rest I think went well in.
The 3rd step was not in equilibrium. I also thought i went well in the exam, 19/20 or 20/20 in multiple choice and near full marks in the main and option. Easily over 85, probs low to high 90's. I finished with a full 45 minutes and that was taking the exam slowly.
 

lolcakes52

Member
Joined
Oct 31, 2011
Messages
286
Gender
Undisclosed
HSC
2012
For the question about why add barium sulfate, I said that it would turn the solution to a whitish colour and make it easier to see the colour changes in the indicator. Is that even remotely correct?
Yes, that seems to be the right anwser.
 

Nympha

Member
Joined
Jan 13, 2010
Messages
74
Location
Sydney
Gender
Female
HSC
2011
For the question about why add barium sulfate, I said that it would turn the solution to a whitish colour and make it easier to see the colour changes in the indicator. Is that even remotely correct?
This has been answered in previous pages. However, to answer your question.. yes :)
 

Awkward_Ninja

Member
Joined
Mar 9, 2011
Messages
96
Gender
Male
HSC
2011
Hated the chem exam.
Even harder than my trial, which was still pretty damn hard.
Multiple choice was the best part of it. Everything afterwards screwed me over.
50 at worst, and maybe 60-something at best for a raw. Hoping and praying and crossing all my fingers and toes that my rank and scaling will kick it up to an alright mark.
 

Username2

New Member
Joined
Jun 22, 2009
Messages
19
Gender
Undisclosed
HSC
N/A
Re: Chem How HARD!!

Whats everyone's thoughts on making up a random nuclear equation (one that was clearly wrong) in order to illustrate a principle?
 

lolcakes52

Member
Joined
Oct 31, 2011
Messages
286
Gender
Undisclosed
HSC
2012
Re: Chem How HARD!!

Whats everyone's thoughts on making up a random nuclear equation (one that was clearly wrong) in order to illustrate a principle?
Bad, why would they give a mark for a wrong piece of information.
 
K

khorne

Guest
Re: Chem How HARD!!

Whats everyone's thoughts on making up a random nuclear equation (one that was clearly wrong) in order to illustrate a principle?
In what sense? If you say, collided two ions, as long as it made a transuranic element, that is fine.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top