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#61 Ally

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Posted 05 June 2004 - 11:26 PM

Can anyone remember what Q14 was? Supposedly that was the trickiest along with Q3 and Q17.

#62 werlop

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Posted 06 June 2004 - 03:16 PM

What did you put as your answer to "Why is the aromatic ring stable?"
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#63 james1

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Posted 06 June 2004 - 03:17 PM

thats the bad thing about Higher Chemistry u cant take ur answer paper out unless u want 0 marks

#64 Ally

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Posted 06 June 2004 - 05:55 PM

I said that it has delocalised electrons and just wrote about them... blink.gif

I think you could take a paper but you would have to ask your teacher - I may do that tomorrow.

#65 james1

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Posted 06 June 2004 - 07:23 PM

QUOTE (werlop @ Jun 6 2004, 03:16 PM)
What did you put as your answer to "Why is the aromatic ring stable?"

Aromatics are very stable due to the ring of delocalised Pi electrons.

#66 james1

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Posted 06 June 2004 - 07:24 PM

QUOTE (ally @ Jun 6 2004, 05:55 PM)
I said that it has delocalised electrons and just wrote about them... blink.gif

I think you could take a paper but you would have to ask your teacher - I may do that tomorrow.

the most your teacher will have is 9 copies

#67 werlop

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Posted 06 June 2004 - 09:06 PM

QUOTE (james1 @ Jun 6 2004, 07:24 PM)
QUOTE (ally @ Jun 6 2004, 05:55 PM)
I said that it has delocalised electrons and just wrote about them... blink.gif

I think you could take a paper but you would have to ask your teacher - I may do that tomorrow.

the most your teacher will have is 9 copies

Yeah, the paper's come in packs of 10, but if your really desparate, you could mabye get a photocopy...then again there is copyright and all that..
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If you can keep your head when all about you
Are losing theirs and blaming it on you,
If you can trust yourself when all men doubt you
But make allowance for their doubting too,
If you can wait and not be tired by waiting,
Or being lied about, don't deal in lies,
Or being hated, don't give way to hating,
And yet don't look too good, nor talk too wise:
Yours is the Earth and everything that's in it,
And--which is more--you'll be a Man, my son!

#68 Infinite_Dreams

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Posted 15 June 2004 - 11:09 PM

Answers I put to various questions in a random order:

Aromatic ring is stable due to the delocalised electrons.

I put ethyne for the nmr spectrum question (I drew a diagram of the substance based on the lines, so I'm fairly sure it's ethyne).

Can't remember for the eletrolysis...was in the 50s though.

Vitamin C was in excess, and so all the iodine reacted.

For the mag ribbon question, I inverted the graduated tube into water, with the funnel going into the tube, with magnesium below it. To calculate the molar volume, I put that you would measure the mass of the tube when empty (daft...it's the mass lost in the solution...oh well) then full. Then use:
x= (volume collected * 2) / mass when full (should have been mass lost)... where 2 is the gram formula mass of one mole of hydrogen gas.

I put the sulphuric acid into the neutraliser, and put sulphur dioxide. I was swithering between trioxide and dioxide, but chose dioxide because it's one of the first reactants in the contact process (if sulphur is discounted), and dioxide seemed more realistic based on the other reactions taking place. Also, dioxide is more commonly a by-product than trioxide (excuse me if it wasn't actually a by-product; I'm trying to remember from two weeks ago here!) Then there's also the fact that the process just said "reactions", not oxidation or anything else that would imply that ONLY SO3 is used. Therefore in the reactions stage, the entire conversion from sulphur dioxide to sulphuric acid could have taken place. Pretty vague question, if you ask me. Hopefully the SQA will take the two into account and give the correct answer for BOTH, since both can be justified.

I think I put displacement, but I can't remember for sure what the question even was!

Can't remember what gas I put other than SO2.

I got somewhere in the -53/-54 kJ/mol range. Somewhere around there.

The water molecules would be attracted to any of the oxygens I think.

Can't remember the (3+4) multiple choice question...

--------------------------------

What did people put for the number of atoms in 8g of phosphorus-32? I put 6.02*10^23, but I'm not 100% sure. Here's my reasons:

Phosphorus is molecular, with 4 atoms per molecule. So there are 4*L atoms, each weighing 32g in one mole. However, since it's only 8g, it's 4*L*8/32 = L therefore 6.02*10^23 atoms. Correct?

Overall I found the paper to be quite easy, especially when compared to last year's. I finished with exactly an hour left, so I had plenty time to check over. The multiple choice was quite straightforward too.

#69 james1

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Posted 16 June 2004 - 08:18 AM

did u get a question on nmr? ohmy.gif

thats AH

#70 james1

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Posted 16 June 2004 - 08:23 AM

no it is 0.25L which will be 1.51*10^23 atoms correct to 3sf

#71 Infinite_Dreams

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Posted 16 June 2004 - 03:29 PM

I realised it was wrong as I posted it. I forgot that there's 4 atoms in the 8g sample...oh well. nmr spectrum was the chemical shift question.

#72 rennie

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Posted 24 June 2004 - 11:10 AM

the answer for the last question was definetly propyne and no ethyne.

#73 Infinite_Dreams

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Posted 25 June 2004 - 09:57 PM

Maybe it was. I can't remember for sure so I'm not really bothered. I do remember drawing out the molecule to make sure, so I dunno. If I could see the paper, then...

#74 Dave

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Posted 26 June 2004 - 06:06 PM

well i stil think it was ethyne but then i would as i wrote that answer as did a number of my friends and a number on this board. HOWEVER, it does seem strange that equal numbers also think that it was propyne so who can really tell enless someone on the board has a parent marking the paper this year biggrin.gif

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#75 james1

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Posted 26 June 2004 - 10:38 PM

if u tell me the question i can help

#76 little_minx

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Posted 27 June 2004 - 09:05 AM

QUOTE (james1 @ Jun 26 2004, 11:38 PM)
well i stil think it was ethyne but then i would as i wrote that answer as did a number of my friends and a number on this board. HOWEVER, it does seem strange that equal numbers also think that it was propyne so who can really tell enless someone on the board has a parent marking the paper this year

My chemistry teacher did the question to show me and it was PROPYNE (I wrote ethyne as well) and on the graph thingy there should have been seven lines. sad.gif uh oh

Laura xxx

#77 james1

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Posted 27 June 2004 - 09:34 AM

is this a question on identifying a chemical based on its chemical shift graph against intensity of transmitted radiation

AH paper also had that one right at the very end

#78 little_minx

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Posted 27 June 2004 - 09:47 AM

QUOTE (james1 @ Jun 27 2004, 10:34 AM)
is this a question on identifying a chemical based on its chemical shift graph against intensity of transmitted radiation

AH paper also had that one right at the very end

'tis! And I completely screwed it up!

#79 Dave

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Posted 27 June 2004 - 02:02 PM

actually little_Minx that was what i said and not james 1 but its no big deal really biggrin.gif (thats the 1st one by the way)

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#80 Ally

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Posted 27 June 2004 - 02:49 PM

QUOTE (little_minx @ Jun 27 2004, 09:05 AM)
QUOTE (james1 @ Jun 26 2004, 11:38 PM)
well i stil think it was ethyne but then i would as i wrote that answer as did a number of my friends and a number on this board. HOWEVER, it does seem strange that equal numbers also think that it was propyne so who can really tell enless someone on the board has a parent marking the paper this year

My chemistry teacher did the question to show me and it was PROPYNE (I wrote ethyne as well) and on the graph thingy there should have been seven lines. sad.gif uh oh

Laura xxx

Wohoo!

Thats what I got for my answers. biggrin.gif tongue.gif





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