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Chemistry 2006 exam


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Poll: How was it? (44 member(s) have cast votes)

how easy was it?

  1. Very hard (1 votes [2.27%])

    Percentage of vote: 2.27%

  2. Hard (10 votes [22.73%])

    Percentage of vote: 22.73%

  3. OK (24 votes [54.55%])

    Percentage of vote: 54.55%

  4. Easy (8 votes [18.18%])

    Percentage of vote: 18.18%

  5. Really easy (1 votes [2.27%])

    Percentage of vote: 2.27%

What grade do you think you got?

  1. A (18 votes [40.91%])

    Percentage of vote: 40.91%

  2. B (22 votes [50.00%])

    Percentage of vote: 50.00%

  3. C (3 votes [6.82%])

    Percentage of vote: 6.82%

  4. D (1 votes [2.27%])

    Percentage of vote: 2.27%

  5. Fail (0 votes [0.00%])

    Percentage of vote: 0.00%

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#81 jon2005

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Posted 30 May 2006 - 07:47 PM

QUOTE(AmAnDa @ May 30 2006, 08:43 PM) View Post

QUOTE(rscott @ May 30 2006, 06:19 PM) View Post

I got stuck on the question that asked for the mass of chlorine for like ten minutes, cause I kept getting an answer like 1400000000000kg. I think I got it eventually though lol.

Did anyone get 10% for the percentage yield question?


You dont no how glad I am to here you say that u got 10%, I got that too and was so sure it was wrong. Isn't it unusual for the answer to be as low as 10%?!?



hmm know for a fact I f**ked up that question... I did the calculation like doing Percentage Yield= Actual/Theoretical *100

just my value for Actual Yield was screwed....would I still get 1/2 for that question :S

#82 Gillz

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Posted 30 May 2006 - 07:51 PM

QUOTE(Tinkerbell @ May 30 2006, 08:40 PM) View Post

QUOTE(Dhesi @ May 30 2006, 08:32 PM) View Post

Im sure it was condensation polymerisation because for addition there had to be a double bond which wasnt possible


It looked like addition polymerisation to me... unsure.gif


Yip i thought it was addition as well !


#83 destiny determined otherwise

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Posted 30 May 2006 - 07:54 PM

does anyone know where there are actual answers cause usually some teachers will have done the paper and put it on the web???

#84 David_07

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Posted 30 May 2006 - 07:58 PM

QUOTE(Dhesi @ May 30 2006, 08:45 PM) View Post

aye it showed the polymer so the water woulda been removed whereas with addition a double bond would have to have been broken which was impossible.


It never showed the monomer though. It asked you to work out the monomer and if you had worked it out correctly, you would find that the monomer units had double bonds. Two double bonds were broken to form the polymer, so it was addition polymerisation.

#85 jon2005

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Posted 30 May 2006 - 08:00 PM

QUOTE(destiny determined otherwise @ May 30 2006, 08:54 PM) View Post

does anyone know where there are actual answers cause usually some teachers will have done the paper and put it on the web???



I second that request tongue.gif

#86 Nathan

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Posted 30 May 2006 - 08:14 PM

QUOTE(jon2005 @ May 30 2006, 09:00 PM) View Post

I second that request tongue.gif


thirded...a copy of the paper would also be nice...any nice people wanna pm me rolleyes.gif smile.gif

#87 hmmm

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Posted 30 May 2006 - 08:24 PM

fourthed,anybody with a paper can you please pm me:D?

#88 **Bernadette**

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Posted 30 May 2006 - 08:41 PM

QUOTE(hmmm @ May 30 2006, 09:24 PM) View Post

fourthed,anybody with a paper can you please pm me:D?


And me!! biggrin.gif

BTW I got addition polymerisation too.

#89 Michael

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Posted 30 May 2006 - 08:45 PM

QUOTE(David_07 @ May 30 2006, 08:58 PM) View Post

QUOTE(Dhesi @ May 30 2006, 08:45 PM) View Post

aye it showed the polymer so the water woulda been removed whereas with addition a double bond would have to have been broken which was impossible.


It never showed the monomer though. It asked you to work out the monomer and if you had worked it out correctly, you would find that the monomer units had double bonds. Two double bonds were broken to form the polymer, so it was addition polymerisation.

Yeah I know, you had to work out the monomer.

#90 ice_illusion

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Posted 30 May 2006 - 08:59 PM

I had addition too.
For the monomer I just copied the example above and swapped a hydrogen for a methyl group.

#91 mujb

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Posted 30 May 2006 - 09:02 PM

QUOTE(ice_illusion @ May 30 2006, 09:59 PM) View Post

I had addition too.
For the monomer I just copied the example above and swapped a hydrogen for a methyl group.


me too. pretty sure thats right

#92 crazycat89

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Posted 30 May 2006 - 09:53 PM

hey just wondering if anyone else noticed that there were a lot of past paper questions? or was it just me.. lol
overall, it was better than i imagined it to be...
smile.gif

#93 Mark

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Posted 30 May 2006 - 10:41 PM

QUOTE(crazycat89 @ May 30 2006, 10:53 PM) View Post

hey just wondering if anyone else noticed that there were a lot of past paper questions? or was it just me.. lol
overall, it was better than i imagined it to be...
smile.gif

Yeah but if you're anything like me you were probably imagining it to be pretty terrible to start with so anything better was a bonus. Definitely noticed a few past paper questions come up. doubt I'd have finished on time otherwise coz they basically took seconds to do.

#94 maria

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Posted 30 May 2006 - 11:39 PM

i cannot remember for the life of me what i put down for Multi-choice! will see it next week when i go into school!

quickly went over the extended answers bit with the teacher today, and i dont think it was a major muck-up! just hope that my MC wasnt really really bad (as it usually is much lower than my extended answers, always what pulls my grade that bit down then cant get my A, grrrr!)
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#95 Adam

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Posted 31 May 2006 - 11:23 PM

Hmm.. for Q6(b), where it shows a graph of Reaction Rate against Temperature, I said that the rate decreases above the optimum temperature because enzymes are highly specific and work best at certain conditions (i.e optimum temperature). Will that get me the mark..? huh.gif

#96 Mark

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Posted 31 May 2006 - 11:59 PM

QUOTE(Adam @ Jun 1 2006, 12:23 AM) View Post

Hmm.. for Q6(b), where it shows a graph of Reaction Rate against Temperature, I said that the rate decreases above the optimum temperature because enzymes are highly specific and work best at certain conditions (i.e optimum temperature). Will that get me the mark..? huh.gif



That is true. I think what they are looking for here is that the enzyme is denatured i.e it's shape is permanently changed and essentially the active site is altered so the enzyme ceases to function. (This is from my biology knowledge) Just depends how tight the marking scheme is. Essentially I think they were looking for "the enzyme is denatured" well that's what I put.

#97 sarmad

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Posted 01 June 2006 - 10:02 AM

i said it was denatured as well!!!

#98 Michael

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Posted 01 June 2006 - 10:06 AM

QUOTE(Adam @ Jun 1 2006, 12:23 AM) View Post

Hmm.. for Q6(b), where it shows a graph of Reaction Rate against Temperature, I said that the rate decreases above the optimum temperature because enzymes are highly specific and work best at certain conditions (i.e optimum temperature). Will that get me the mark..? huh.gif

Depends how tight the marking scheme is but I recon they were looking for denatures, change in shape etc.

#99 **Bernadette**

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Posted 01 June 2006 - 10:13 AM

QUOTE(Adam @ Jun 1 2006, 12:23 AM) View Post

Hmm.. for Q6(b), where it shows a graph of Reaction Rate against Temperature, I said that the rate decreases above the optimum temperature because enzymes are highly specific and work best at certain conditions (i.e optimum temperature). Will that get me the mark..? huh.gif


I think it could because they always try and do that positive marking thing. You are not wrong so they can't really take away marks.





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