2014 Chemistry Exam Solutions

[2NE1]

I doubt catalyst will be accepted

much sad haha 1 mark oh well, I wish I would've been bothered to write "it is an electrolyte" but you probably have to explain what an electrolyte does, that's why I was like maybe catalyst will cut it haha

[lzxnl]

I'll look through these solutions after my final exam tomorrow.

[2NE1]

For the very last SA question, I wrote insulate beaker, use a stirrer and using something like wool to cover up the bits of the holes in the lid where the stirrer and thermometer  go (with elaboration of why for these all of course) and that catalysts don't change molar enthalpy (ranting about how it only affects rate too).

Is this enough for 5 marks?

Well that is not what I wrote but I think it's completely right. I wrote how the volume and conc. of H2O2 should be the same and the catalyst amount should be the same just to show the only variable is the type of catalyst. And same as you for molar enthalpy, it only lowers activation energy.

[Kaleidoscope]

I wrote how the volume and conc. of H2O2 should be the same and the catalyst amount should be the same just to show the only variable is the type of catalyst. And same as you for molar enthalpy, it only lowers activation energy.

Oh my god I literally had the same answer as you, in the same order haha

[suberman123]

For the Quinone question I wrote Br2 + 2e- -> 2Br- which does not include the H+
And I wrote QH2 as aqueous but Q as liquid.
Do I lose any marks for those? Thank you

[Aman476]

For the Quinone question I wrote Br2 + 2e- -> 2Br- which does not include the H+
And I wrote QH2 as aqueous but Q as liquid.
Do I lose any marks for those? Thank you

I wrote q as liquid too bro - but I don't see why we would lose marks because quinone isn't on study design so we weren't supposed to know if it was soluble in water.

I think I lost around 6 marks in this paper I hope I can still hit a 46/47 but idk....ahha bloody dumb mistakes

[thushan]

For the Quinone question I wrote Br2 + 2e- -> 2Br- which does not include the H+
And I wrote QH2 as aqueous but Q as liquid.
Do I lose any marks for those? Thank you

Not including the H+...I don't know, it could go either way with VCAA, it's technically correct since HBr (aq) is just H+ and Br-, but the question explicitly stated HBr was formed.

As for the QH2...don't think you'll get the mark for writing (l) since the question stated "aqueous solutions of QH2" or something along those lines.

[lzxnl]

Not including the H+...I don't know, it could go either way with VCAA, it's technically correct since HBr (aq) is just H+ and Br-, but the question explicitly stated HBr was formed.

As for the QH2...don't think you'll get the mark for writing (l) since the question stated "aqueous solutions of QH2" or something along those lines.

I would be REALLY cheesed off if HBr(aq) was the only answer accepted because come on. That thing is a stronger acid than hydrochloric acid.

[Aman476]

Not including the H+...I don't know, it could go either way with VCAA, it's technically correct since HBr (aq) is just H+ and Br-, but the question explicitly stated HBr was formed.


As for the QH2...don't think you'll get the mark for writing (l) since the question stated "aqueous solutions of QH2" or something along those lines.

Shit, do they take a mark of for every equation you had the wrong state in or just the first one.....how did I miss the aqueous wow

[thushan]

When I did Chemistry in 2011 you only lost maximum 1 mark for incorrect states from memory.

[thushan]

I would be REALLY cheesed off if HBr(aq) was the only answer accepted because come on. That thing is a stronger acid than hydrochloric acid.

Nothing on fluoroantimonic acid though

[suberman123]

So 8 marks are gone 
I am desperate to see whether I lose another mark for writing grounding apricots to powder to increase the rate of reaction. Assume my MC matches yours (16C and has not counted Q12 yet), I may lose up to 9 marks already 

[suberman123]

Oh yeah and I don't think I would lose another mark for writing ions since in the Q2 of 2013 exam they asked to write a balanced equation from (NH4)2C2O4 aqueous to CaC2O4.H2O solid and they accepted a range of answers. But not sure with the "overall equation" in this year's question though.

But I lose a mark for wrong state anyway

[Yuki N.]

So 8 marks are gone 
I am desperate to see whether I lose another mark for writing grounding apricots to powder to increase the rate of reaction. Assume my MC matches yours (16C and has not counted Q12 yet), I may lose up to 9 marks already 

depends on how lenient VCAA is but idk, seems rather superficial in the context of the question (why does it matter there's a greater reaction rate if not all the SO2 has been reacted?)

[2NE1]

Oh my god I literally had the same answer as you, in the same order haha

yeah cause that's the orser it was in the table they gave us