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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Martoman on May 24, 2010, 09:53:32 pm

Title: Which functional group is present in all nitrogen bases in DNA?
Post by: Martoman on May 24, 2010, 09:53:32 pm
I am tempted to say amine, but amine is and this is not present in thymine. Or can we say that a secondary amine exists in the form of so then amine is the group present in all?

This is from NEAP 2008 btw, which I found quite easy. How did you guys feel on this exam (if you've done it?)
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: olly_s15 on May 24, 2010, 09:56:05 pm
I am tempted to say amine, but amine is and this is not present in thymine. Or can we say that a secondary amine exists in the form of so then amine is the group present in all?

This is from NEAP 2008 btw, which I found quite easy. How did you guys feel on this exam (if you've done it?)

printed it today but have not completed - it will be interesting to see if i find it "easy"
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: vexx on May 24, 2010, 10:08:48 pm
I am tempted to say amine, but amine is and this is not present in thymine. Or can we say that a secondary amine exists in the form of so then amine is the group present in all?

This is from NEAP 2008 btw, which I found quite easy. How did you guys feel on this exam (if you've done it?)

this is the only recent full exam i've done :o it was pretty easy except i made stupid mistakes.

yeah amine group is common to all, if NH2 attached to a single carbon it is a primary amine, if NH bonded to two carbons it is secondary and if N bonded to three carbons it's tertiary.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Martoman on May 24, 2010, 10:10:01 pm
Yeah there is one really interesting question about a random molecule to work out that i didn't get. Apart from that, it was staple neap: an actual company representative of VCAA.

I would be interested as well to see how you went as I'd like to compare my performance!
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Stroodle on May 24, 2010, 10:12:29 pm
I found Neap 2008 and 2009 to be pretty easy, but still had to think a bit more than in other exams. Got 93% on the 2008 and 97% on the 2009. Haven't done the 2010 yet.

How'd you go?
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: vexx on May 24, 2010, 10:14:38 pm
Yeah there is one really interesting question about a random molecule to work out that i didn't get. Apart from that, it was staple neap: an actual company representative of VCAA.

I would be interested as well to see how you went as I'd like to compare my performance!

i didn't do that well too be honest, i made silly mistakes ><. 17/20 for MC and 47/50 for SA. how about you?
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: stonecold on May 24, 2010, 10:22:00 pm
How did people find VCAA 2009 out of interest?  I made some very dumb mistakes, but time wasn't a problem like everyone was making out. I made the A+ cut-off, but still lots of room for improvement.  There was nothing difficult on it...

I personally loved last years exam.  I hope we get something similar this year. :)
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Martoman on May 24, 2010, 10:23:12 pm
yeah i got my teacher to mark it 89% for the neap 08.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: naved_s9994 on May 24, 2010, 10:28:22 pm
How did people find VCAA 2009 out of interest?  I made some very dumb mistakes, but time wasn't a problem like everyone was making out. I made the A+ cut-off, but still lots of room for improvement.  There was nothing difficult on it...

I personally loved last years exam.  I hope we get something similar this year. :)

LOL!
Not quite what Ive heard about. Ive got it printed, and all. WIll probably sit it this weekend. Then I will let you know my score :P

However, I must admit. By doing X amount of exams, you really do pick up the questions that are 'frequently' enough, asked.

@Martoman 93% here :P

I got higher, but had to take off all my half marks I gave myself, whilst marking :P
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Martoman on May 24, 2010, 10:30:48 pm
Yes i hope for last years exam but much harder, i got 94 on that one.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: stonecold on May 24, 2010, 10:38:24 pm
Yes i hope for last years exam but much harder, i got 94 on that one.

Nice!  I reckon that would have kept you on 50 pace last year, considering A+ was 78% and above. :D
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Martoman on May 24, 2010, 10:39:54 pm
Holy shit. It couldn't've been. what about 08's cut off?
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: olly_s15 on May 24, 2010, 10:44:26 pm
87%
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: vexx on May 24, 2010, 10:56:21 pm
How did people find VCAA 2009 out of interest?  I made some very dumb mistakes, but time wasn't a problem like everyone was making out. I made the A+ cut-off, but still lots of room for improvement.  There was nothing difficult on it...

I personally loved last years exam.  I hope we get something similar this year. :)

imma do this one in a week and a half. and i hope it's going to be long too with an uber low A+ cutoffs!
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Martoman on May 24, 2010, 11:04:55 pm
If 09's exam is considered challenging then we most definitely will do well on the mid-years.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kyzoo on May 24, 2010, 11:05:00 pm
Holy shit. It couldn't've been.

The Physics lecturer guy for the KLD/UMEP Extension Student Lectures said that he took 2 hours to do the Chem 2009 exam, despite taking 40 minutes to do the Physics 2009.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: olly_s15 on May 24, 2010, 11:06:58 pm
Holy shit. It couldn't've been.

The Physics lecturer guy for the KLD/UMEP Extension Student Lectures said that he took 2 hours to do the Chem 2009 exam, despite taking 40 minutes to do the Physics 2009.

lets hope physics isn't this easy - i don't want to sit in the exam thinking i might have got something wrong for half an hour
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kyzoo on May 24, 2010, 11:07:41 pm
If 09's exam is considered challenging then we most definitely will do well on the mid-years.

I don't think Chem is about challenging concepts as much as it is about little details. This subject is a LOT MORE pedantic than Methods. It's little things like being specific in error description, stoichemistry, question interpretation, etc that need to be mastered.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: stonecold on May 24, 2010, 11:08:44 pm
yeah, i hope the cover that's says 9 questions is a lie, and it's really like 11 haha!

more questions is good.  some people say its too much but get over it.  its an exam, not a stroll through the park.  you're supposed to be under pressure!
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Stroodle on May 24, 2010, 11:10:13 pm
Holy shit. It couldn't've been.

The Physics lecturer guy for the KLD/UMEP Extension Student Lectures said that he took 2 hours to do the Chem 2009 exam, despite taking 40 minutes to do the Physics 2009.

lets hope physics isn't this easy - i don't want to sit in the exam thinking i might have got something wrong for half an hour

lol, yeah. 96% was the cutoff last year. Glad we're doing relativity at my school; virtually no content at all, and VCAA always uses the same questions :)
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: stonecold on May 24, 2010, 11:15:10 pm
If 09's exam is considered challenging then we most definitely will do well on the mid-years.

I don't think Chem is about challenging concepts as much as it is about little details. This subject is a LOT MORE pedantic than Methods. It's little things like being specific in error description, stoichemistry, question interpretation, etc that need to be mastered.

It is very pedantic.  It is a lot easier to limit the loss of marks in further/methods than it is in science.

Is it just me, or is it almost impossible not to lose the mark for sig figs?  One little screw up, and that's a mark gone...
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kyzoo on May 24, 2010, 11:24:40 pm
Holy shit. It couldn't've been.

The Physics lecturer guy for the KLD/UMEP Extension Student Lectures said that he took 2 hours to do the Chem 2009 exam, despite taking 40 minutes to do the Physics 2009.

lets hope physics isn't this easy - i don't want to sit in the exam thinking i might have got something wrong for half an hour

lol, yeah. 96% was the cutoff last year. Glad we're doing relativity at my school; virtually no content at all, and VCAA always uses the same questions :)

My Physics teacher said that that's the hardest detailed study, and Further electronics is the easiest.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: olly_s15 on May 24, 2010, 11:27:56 pm
Holy shit. It couldn't've been.

The Physics lecturer guy for the KLD/UMEP Extension Student Lectures said that he took 2 hours to do the Chem 2009 exam, despite taking 40 minutes to do the Physics 2009.

lets hope physics isn't this easy - i don't want to sit in the exam thinking i might have got something wrong for half an hour

lol, yeah. 96% was the cutoff last year. Glad we're doing relativity at my school; virtually no content at all, and VCAA always uses the same questions :)

My Physics teacher said that that's the hardest detailed study, and Further electronics is the easiest.

my teacher thinks materials and structures is the easiest....
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kenhung123 on May 24, 2010, 11:37:53 pm
One of Kyzoo's physics teacher is freaking awesomeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kyzoo on May 24, 2010, 11:38:55 pm
One of Kyzoo's physics teacher is freaking awesomeeeeeeeeeeeeeeeeeeeeeeeeeeeee

LOL I only have one
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Mao on May 25, 2010, 02:34:33 am
ANYWAYS, back on topic, to answer martoman's question, yes, amine would be fine.

A primary amine is in the form R-NH2, secondary amine is in the form R2-NH, and tertiary amine is in the form N-R3. All three are classed as amines.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kenhung123 on May 25, 2010, 04:20:35 pm
One of Kyzoo's physics teacher is freaking awesomeeeeeeeeeeeeeeeeeeeeeeeeeeeee

LOL I only have one
Oh I meant like from your school
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Blakhitman on May 25, 2010, 04:30:42 pm
One of Kyzoo's physics teacher is freaking awesomeeeeeeeeeeeeeeeeeeeeeeeeeeeee

LOL I only have one
Oh I meant like from your school

Lecturer at TSFX was from MGS, Geoff Davies (assistant assessor?)...yeah was an awesome bloke lol.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kenhung123 on May 25, 2010, 08:05:08 pm
Btw, I heard the length of the 2009 exam 1 was more of a concern than the difficulty
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: kyzoo on May 25, 2010, 10:11:37 pm
How did people find VCAA 2009 out of interest?  I made some very dumb mistakes, but time wasn't a problem like everyone was making out. I made the A+ cut-off, but still lots of room for improvement.  There was nothing difficult on it...

I personally loved last years exam.  I hope we get something similar this year. :)

...I finished it just within time limit >.< and I was rushing for the last 30 minutes as well

and 91%
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Blakhitman on May 27, 2010, 05:03:20 pm
what about amino???

hope my teacher allows it >< lol.

ALSO: What do people think the answer to this is?

State the name of a technique that could be used to separate a mixture containing alkanes with chain lengths varying from 5 to 25.
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: qshyrn on May 27, 2010, 05:24:08 pm
what about amino???

hope my teacher allows it >< lol.

ALSO: What do people think the answer to this is?

State the name of a technique that could be used to separate a mixture containing alkanes with chain lengths varying from 5 to 25.
frac dist?
Title: Re: Which functional group is present in all nitrogen bases in DNA?
Post by: Martoman on May 27, 2010, 05:33:54 pm
Defs that.