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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%

Vote Guests cannot vote

#41 Nathan

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Posted 30 May 2006 - 06:00 PM

QUOTE(ice_illusion @ May 30 2006, 06:46 PM) View Post

I drew a test tube with a stopper on that had a tube leading out of it into a basin full of water, which had a upturned measuring cylinder in. My test tube with solid inside was in a hot water bath.
I'm hoping the gas that came out of it isn't soluble in water. Anyone know?


nah, it was methane gas, so i don't think its soluble unsure.gif

#42 Mark

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Posted 30 May 2006 - 06:02 PM

QUOTE(David_07 @ May 30 2006, 06:59 PM) View Post

Hey, this is my first post. I was on Gabbly earlier though, talking about this exam.

I suppose it wasn't too bad, I got about 30 or 31 for MC and I thought the rest went quite well.


For that bag question, I put so that the same amount of air is used every time and makes it more accurate. I also noticed the equation had water in it so I added that it collects the water unsure.gif


Don't think there is any negative marking so even if that's not what they were looking for they'd just pick out the right bit. biggrin.gif

#43 David_07

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Posted 30 May 2006 - 06:05 PM

The mass of chlorine question had these figures if I remember rightly.

80000A x 10h

= 2.88x10^9

2.88x10^9 / 193000 (2 moles e-)

= 14922

14922 x 71g (Cl2) = 1059 Kg

I mucked it up at the end as I took Cl as 35.5g. sad.gif

#44 ice_illusion

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Posted 30 May 2006 - 06:05 PM

QUOTE(Mark @ May 30 2006, 07:02 PM) View Post

QUOTE(David_07 @ May 30 2006, 06:59 PM) View Post

Hey, this is my first post. I was on Gabbly earlier though, talking about this exam.

I suppose it wasn't too bad, I got about 30 or 31 for MC and I thought the rest went quite well.


For that bag question, I put so that the same amount of air is used every time and makes it more accurate. I also noticed the equation had water in it so I added that it collects the water unsure.gif


Don't think there is any negative marking so even if that's not what they were looking for they'd just pick out the right bit. biggrin.gif

The marking scheme seems really nice for chemistry. I was looking at it yesterday on the sqa site (the past papers we were given don't have answers) and they really do want to give people marks. Which is good.


#45 David_07

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Posted 30 May 2006 - 06:06 PM

The marking scheme is good, but I suppose they make up for it by having higher grade bands than other subjects.

#46 Mark

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Posted 30 May 2006 - 06:06 PM

QUOTE(David_07 @ May 30 2006, 07:05 PM) View Post

The mass of chlorine question had these figures if I remember rightly.

80000A x 10h

= 2.88x10^9

2.88x10^9 / 193000 (2 moles e-)

= 14922

14922 x 71g (Cl2) = 1059 Kg

I mucked it up at the end as I took Cl as 35.5g. sad.gif


yeah that looks familiar

#47 Nathan

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Posted 30 May 2006 - 06:07 PM

QUOTE(ice_illusion @ May 30 2006, 07:05 PM) View Post

The marking scheme seems really nice for chemistry. I was looking at it yesterday on the sqa site (the past papers we were given don't have answers) and they really do want to give people marks. Which is good.


yeah, it;s really nice compared to like biology...they don't even give you half marks sad.gif

#48 David_07

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Posted 30 May 2006 - 06:11 PM

Still trying to remember what I put for that balanced formula for the explosive stuff. Took me ages.

I know for sure I put a 2 before the first bit, which read 2 C3 H5 N3 O9.

#49 Mark

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Posted 30 May 2006 - 06:13 PM

yup and you ended up with 1/2 02 at the end?

#50 David_07

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Posted 30 May 2006 - 06:15 PM

QUOTE(Mark @ May 30 2006, 07:13 PM) View Post

yup and you ended up with 1/2 02 at the end?


Yep. I thought I'd got it wrong when it came out as 19 Oxygens, then I realised I could stick a half beside the last bit.

#51 ad absurdum

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Posted 30 May 2006 - 06:16 PM

QUOTE(rscott @ May 30 2006, 06:51 PM) View Post

Anyone get addition polymerisation for that synthetic plastic thing???
I think I did. Can't remember too well though.

QUOTE(jon2005 @ May 30 2006, 06:52 PM) View Post

why was a bag used in that question with the drinks test? yup got additon.
I said it was because if the bag wasn't there then the breath to be tested would just travel straight through the tube and wouldn't stay in it long enough for the reaction to take place - in other words I didn't have a clue.
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#52 Adam

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Posted 30 May 2006 - 06:22 PM

For the balanced equation I put:

C3H5N3O9 -> 1.5N2 + 2.5H2O + 3CO2 + 0.25O2

QUOTE(rscott)
Anyone get addition polymerisation for that synthetic plastic thing???

Aye.

#53 David_07

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Posted 30 May 2006 - 06:28 PM

QUOTE(Betinho @ May 30 2006, 07:22 PM) View Post

For the balanced equation I put:

C3H5N3O9 -> 1.5N2 + 2.5H2O + 3CO2 + 0.25O2

QUOTE(rscott)
Anyone get addition polymerisation for that synthetic plastic thing???

Aye.



I remember it now.

I put 2 C3H5N3O9 ------ 3 N2 + 5 H2O + 6 CO2 + 0.5 O2

#54 d00pyd

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Posted 30 May 2006 - 06:34 PM

Phew glad that's over!

Was pretty ok I reckon, a few weirdo questions. I was totally bummed on the balloon question and put that it was to show that the person was blowing and not pretending!! Oops!

The answer to the copper graph question was C i think - everyone I spoke to put C anyway.

And I got 1% for the yield - doh! Here's hoping I'll get 1 mark for being close!!

The rubber question was pretty weirdo too!

All in all alright though! Hopefully I'll get the B grade I need for medschool ... fingers crossed ...


#55 Tinkerbell

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Posted 30 May 2006 - 06:46 PM

ooh i just remebered a question i never put an answer for.. it was a wee calculation about americium as a metal oxide and you had to work out the mass of just Americium or something along those lines.. I couldnt figure it out ...Wot did everyone else put for that one? x

#56 David_07

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Posted 30 May 2006 - 06:49 PM

QUOTE(Tinkerbell @ May 30 2006, 07:46 PM) View Post

ooh i just remebered a question i never put an answer for.. it was a wee calculation about americium as a metal oxide and you had to work out the mass of just Americium or something along those lines.. I couldnt figure it out ...Wot did everyone else put for that one? x


Didn't have a clue, so I guessed and put a third of whatever the mass was.

#57 rscott

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Posted 30 May 2006 - 06:50 PM

I got 2.8 to the negative 4.... or something like that.

#58 Adam

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Posted 30 May 2006 - 07:00 PM

What about the part of that question where you had to the write down the nuclear equation?

I put:

IPB Image



#59 sarmad

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Posted 30 May 2006 - 07:07 PM

QUOTE(rscott @ May 30 2006, 07:50 PM) View Post

I got 2.8 to the negative 4.... or something like that.


sounds about right as it was a ratio of 1 americium to 2 oxygens so dont u just devide the americium by two??
i cant believe i screwed up find the mass question in the electrolosis, it was 80000A in 10hours i timed the 10 with sixty and left it as that i needed to times it again by 60 to get it into seconds, how many marks would i drop, as i still followed throgh the question. like in maths u get follow through marks for working???

#60 adf

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Posted 30 May 2006 - 07:08 PM

QUOTE(Betinho @ May 30 2006, 08:00 PM) View Post

What about the part of that question where you had to the write down the nuclear equation?

I put:

IPB Image


Yes, i got that as well.
Does anybody know where a official MC answer scheme might be such as a teachers version?





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