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How was it? - HSN forum - Page 5

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How was it?


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#81 Jonny-Sensei

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Posted 31 May 2005 - 03:11 PM

QUOTE(dfx @ May 31 2005, 02:57 PM)
By the way just googled. Cyclohexanol is a secondary alcohol, so you end up with CyclohexanONE sad.gif

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But isn't the STRUCTURE of cyclohexanone and "cyclohexanal" just the same?
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#82 dfx

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Posted 31 May 2005 - 03:14 PM

Hmmmmmmmm.... I can see how you would draw Cyclohexanone, but how on earth would you draw CyclohexanAL?

#83 YIC

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Posted 31 May 2005 - 03:19 PM

probably doesn't exist tongue.gif

#84 dfx

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Posted 31 May 2005 - 03:20 PM

See what I mean.. its a secondary alcohol.. it oxidizes to a ketone:

user posted image

As for cyhclohexanAL... how would you squeeze on an extra H there, there's no vacant valency. So its cyclohexanONE

#85 YIC

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Posted 31 May 2005 - 03:23 PM

just as well I never wrote a name tongue.gif

#86 Jonny-Sensei

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Posted 31 May 2005 - 03:24 PM

That's what I drew. I forgot about the extra H, so the two mistakes kinda cancelled each other out smile.gif
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#87 gary

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Posted 31 May 2005 - 03:29 PM

i drew that but i have no clue what the hell it is called;.

#88 Jonny-Sensei

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Posted 31 May 2005 - 03:34 PM

There was a question for the volume of CO2 produced, something like:

Expt A - Sulphuric Acid - 1g Lumps.
Expt B - Sulphuric Acid - 1g Powder.
Expt C - Hydrochloric Acid - 1g Lumps.

and a graph of Expt A is given, and you had to draw graphs for Expt's B and C.

Is the answer:
Expt B - Steeper Curve, goes into a straight line quicker at the same volume.
Expt C - Shallower Curve, goes into a straight line slower at same volume.

...?
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#89 dfx

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Posted 31 May 2005 - 03:38 PM

Expt C. was half the volume cause the reaction is:

2HCl + CaCO3 ---> CaCl2 + CO2 + H2O

So the mole ratio is 2:1. But the volume of HCl is same, so for every 2 moles of HCl used theres 1 mole of CO2 released, so its half the volume.

#90 bred

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Posted 31 May 2005 - 03:39 PM

QUOTE(koala_bear123 @ May 31 2005, 12:28 PM)
These were my answers, but quite a few are likely to be wrong

1.D                                    21.B
2.C                                    22.D
3.A B                        23.A C
4.B C                        24.D
5.C                                    25.C
6.D                                    26.A
7.A                                    27.C D
8.B                                    28.A       
9.B C                      29.A   
10.B                                  30.D               
11.A                                  31.B                 
12.A                                  32.A
13.D                                  33.C         
14.A D                    34.D     
15.A                                  35.D               
16.C                                  36.C 
17.A B                      37.B             
18.D                                  38.A  B               
19.C                                  39.B A   
20.B C                    40.C B 

Anyone with answers so that i can compare wud be very useful!
Thanks xx

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I have edited the quote by adding in bold answers I entered that were different to yours. These are the answers I entered in the exam and some will be wrong!
Overall I was quite pleased with how the exam went so I'm quite confident I'll get a B.
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#91 bred

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Posted 31 May 2005 - 03:41 PM

QUOTE(dfx @ May 31 2005, 04:38 PM)
Expt C. was half the volume cause the reaction is:

2HCl + CaCO3 ---> CaCl2 + CO2 + H2O

So the mole ratio is 2:1. But the volume of HCl is same, so for every 2 moles of HCl used theres 1 mole of CO2 released, so its half the volume.

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I didn't do that. sad.gif
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#92 bred

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Posted 31 May 2005 - 03:42 PM

QUOTE(dfx @ May 31 2005, 04:20 PM)
See what I mean.. its a secondary alcohol.. it oxidizes to a ketone:

user posted image

As for cyhclohexanAL... how would you squeeze on an extra H there, there's no vacant valency. So its cyclohexanONE

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For this question I added two carbonyl groups (I thought because it was diatomic maybe there should be two O atoms added!). sad.gif I know what I did was wrong!
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#93 bred

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Posted 31 May 2005 - 03:46 PM

QUOTE(sai @ May 31 2005, 02:57 PM)
i got 60.4 % for the percentage yield Q

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That's what I got as well, I think. 60.4% or 60.6%. huh.gif I'm pretty sure I got it right though.
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#94 bred

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Posted 31 May 2005 - 03:49 PM

QUOTE(koala_bear123 @ May 31 2005, 12:50 PM)
wot did every1 rite for the flour question in the multiple choice , think it was about qu5???

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I chose the option that said to remove the flour particles from the air, because they could cause an explosion.
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#95 FcukWIT

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Posted 31 May 2005 - 03:51 PM

QUOTE(dfx @ May 31 2005, 03:57 PM)
By the way just googled. Cyclohexanol is a secondary alcohol, so you end up with CyclohexanONE sad.gif

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Finally.

I put down CycloHexanone too. The CycloHexanol was a SECONDARY cyclo alcohol (If such a thing exists) there fore by oxidising it you will get a cyclo Ketone.

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#96 bred

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Posted 31 May 2005 - 03:52 PM

QUOTE(allthatfraz @ May 31 2005, 12:22 PM)
What kind of bonding did you say was present in the UF6? non-polar covalent?

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I asked my teacher on the spot and she wasn't that sure. She thought probably ionic though. I got that one wrong.
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#97 Jonny-Sensei

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Posted 31 May 2005 - 03:52 PM

According to the answers we are getting here, the most common answers for the multiple choice are as follows (from the answers of 5 people excluding bred):

1) D 21) B
2) C 22) D
3) B 23) A
4) B 24) D
5) C 25) C
6) D 26) A
7) A 27) B
8) B 28) A
9) C 29) A
10) B 30) D
11) A 31) B
12) A 32) A
13) D 33) C
14) D 34) D
15) A 35) D
16) C 36) C
17) A 37) A
18) D 38) A
19) C 39) B
20) B 40) B

This is by no means definitive, only for a prediction. Although most of these answers occurred in all answers, some questions had a ratio of 3:2 between 2 different answers, so your total mark may be higher by a mark or two.

If this is accurate I got 28/40 smile.gif Not bad IMO.
Roll on ze gap year !!

#98 YIC

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Posted 31 May 2005 - 04:03 PM

QUOTE(bred @ May 31 2005, 04:49 PM)
QUOTE(koala_bear123 @ May 31 2005, 12:50 PM)
wot did every1 rite for the flour question in the multiple choice , think it was about qu5???

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I chose the option that said to remove the flour particles from the air, because they could cause an explosion.

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Me too!! laugh.gif

#99 bred

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Posted 31 May 2005 - 04:14 PM

QUOTE(PinkFloyd @ May 31 2005, 04:52 PM)
According to the answers we are getting here, the most common answers for the multiple choice are as follows (from the answers of 5 people excluding bred):

1)  D  21) B
2)  C  22) D
3)  B           23) A
4)  B  24) D
5)  C  25) C
6)  D  26) A
7)  A  27) B
8)  B  28) A
9)  C  29) A
10) B  30) D
11) A  31) B
12) A   32) A
13) D  33) C
14) D  34) D
15) A  35) D
16) C  36) C
17) A  37) A
18) D  38) A
19) C  39) B
20) B  40) B

This is by no means definitive, only for a prediction. Although most of these answers occurred in all answers, some questions had a ratio of 3:2 between 2 different answers, so your total mark may be higher by a mark or two.

If this is accurate I got 28/40 smile.gif Not bad IMO.

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If those answers are correct I got 32/40. smile.gif
And if 37 is B rather than A I got 33/40. smile.gif

Edited by bred, 01 June 2005 - 09:56 AM.

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#100 dfx

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Posted 31 May 2005 - 04:25 PM

QUOTE(bred @ May 31 2005, 04:52 PM)
QUOTE(allthatfraz @ May 31 2005, 12:22 PM)
What kind of bonding did you say was present in the UF6? non-polar covalent?

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I asked my teacher on the spot and she wasn't that sure. She thought probably ionic though. I got that one wrong.

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My chem teacher took just over a second to answer. "Its a gas" "So?" "Covalent!" ...





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