So whatcha make of the Chemistry paper?

Parsley

I thought it was grand. The predicted experiments didn't come up but the ones that were there were easy enough.

I completely forgot how to do heats of reactions in Q6 but I made a good stab at the paper apart from that. Don't think I quite managed an A though.

Michellenman

I was really surprised by the paper! Normally I only manage to get two of the 3 experiment questions (cause i'm a bit sh*t at chemistry tbh) but it went class, got 7 really good questions, 40+ marks like and then one really really REALLY crap question but thats not gonna make me fail!

KeyLimePie

loved it loved it loved it loved it loved it loved it loved it

I thought chromatography was gonna come up and it DID
I did a post mortem of the marks and i'm defently getting a B3 at LEAST

I did everything except question 6 and 8, in retrospect I should of done the acids and bases/water treatment one but live and learn:)

How many people put propene down as the third member of the alkene family? WRONG it's butene as methene doesn't exist =] now ye all know ye lost 3 percent, like i did!!

Michellenman

Ah for feck sake, i did that! Knew it was too easy to be true!

cHaTbOx

could have gone better

I didnt do as well as i wanted 2 but im sure ill be fine done good experiment hopefully

pocket aces

i thought it was pretty good... the question 5 was a bit different but still doable, and the experiments were fine!

Michellenman

Yeah, experiments were ridiculously easy, nothing difficult in the calculations either.

lovechem

Omg

methene

I thought Sect A was nice

Organic questions were NASTY.

Oh well never have to do it again YESSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS

KeyLimePie

lovechem wrote: »

Omg

methene

I thought Sect A was nice

Organic questions were NASTY.

Oh well never have to do it again YESSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS

so much for your user name:)

Michellenman

KeyLimePie, are you sure it's as high as 3 percent? That seems awful high for such a simple mistake? Thats almost the difference between a grade 1-2-3.

Stressed!

Yes............I got butene right!!
Im DELIGHTED with it!!!!
Hopefully an A!!!


:):)

KeyLimePie

Michellenman wrote: »

KeyLimePie, are you sure it's as high as 3 percent? That seems awful high for such a simple mistake? Thats almost the difference between a grade 1-2-3.

the question was worth 12 marks and was entiteled "draw a structural isomer of the third member of the alkene family and point out any planar and tetrehedal bonding" or so goes
anyone who mistook the third member to be propene instead of butene lost 12marks automatically!

lovechem

KeyLimePie wrote: »

so much for your user name:)

I don't actually love chemistry :pac::pac: rather the opposite. hahaha.

I have hated it since the day we started in 5th year, and now she is but a distant memory

Michellenman

That seems really high?! wow! Feel like a bit of a tool now, three years of higher level chemistry and i make that stupid mistake!

KeyLimePie

Michellenman wrote: »

That seems really high?! wow! Feel like a bit of a tool now, three years of higher level chemistry and i make that stupid mistake!

i know how you feel:(
I've lost a grade from it and not putting in the test for chlorine atoms!!!

andrew

is it me or was 11(B) crazily easy? The one about the car emmissions

Michellenman

Hahaha, yeah i got totally muddled for that too, wouldn't mind but i looked at it literally two minutes before! That and rates of reactions, I did the first three parts or whatever just couldn't get my head around the calculation bit.
Not many definitions asked at all...

Redisle

Sweet Paper! and yeah, 11b was simple, I liked it though, nice and topical and if the statistics are true also interesting..

I had 8 questions done at 3.30 and went on and did all the others. Hopefully an A!
The carboxylic acid in an ant sting is methanoic acid right??

Michellenman

andrew wrote: »

is It Me Or Was 11(b) Crazily Easy? The One About The Car Emmissions

Yeah!

Michellenman

Redisle wrote: »

The carboxylic acid in an ant sting is methanoic acid right??

It is now that you say it! Couldn't remember in the exam so I said Ascorbic acid, whatever that is, it's possible i made it up though.

KeyLimePie

Michellenman wrote: »

Hahaha, yeah i got totally muddled for that too, wouldn't mind but i looked at it literally two minutes before! That and rates of reactions, I did the first three parts or whatever just couldn't get my head around the calculation bit.
Not many definitions asked at all...

personally, i thought the bit below it was more topical:)
the one about al gore!

andrew

i thought benzoic acid?

Michellenman

I didn't even look at the al gore one. Just went straight for the ones i knew!

Caoimhe89

andrew wrote: »

i thought benzoic acid?

nope definitely methanoic acid. Our teacher went on about it at length... maybe she's psychic...

Anyway, paper was ok, I made a stupid mistake (drew octane instead of heptane for no apparent reason), and there was one or two things I wasn't completely sure about. If I'm lucky, and A1... and I might not be lucky!

I NEVER imagined chromatography would come up. I hadn't even looked at it before the paper, so I did it from memory... probably not the best of my questions.

I did 10 with half an hour to spare, couldn't do Q11 and left.

Not too bad all in all!

andrew

ah well at least its only a 3 marker. That said, i an going to leave this thread and never come back lest i come to realise i've done ****e.

kaki

Oh god...

I've just realised that I swapped the axes in the graph on the rate experiment...bye bye 12 marks...

Ah well. At least it's over.

devinejay

Thought it was pretty good alright, did ten questions, no major hiccups so with any luck I'll get an A, I wouldn't have believed that a couple of months ago!

Stupid mistakes;
Spent ages trying figure out which went with which, phosphate, chloride ammonium molybdate and silver nitrate. In the end I put the phosphate answer down for the chloride Q.
Every time I opened a book to study in the last month I had a little note sayin "Go over acids and bases 2"
Guess what I forgot to do...

Yuugib

i forgot the oxidising agent picture thingy just flew out from my head... stupid mistakes

KeyLimePie

Yuugib wrote: »

i forgot the oxidising agent picture thingy just flew out from my head... stupid mistakes

me too! i was looking at them yesterday thinking hmmm...those'd never come up!!! i drew the one for explosions instead, oh well!:)

I've been threw my exam like 20 times!!!
I defently got a B2:)
i'm so effin delighted

jhn_noln

did chem last year and just wondering what experiments came up??? any surprises or stuff apllyin to real life like the spy who died from radiation that came up last yeaR????

daz20

did anyone else drop down to ord from higher i made the right choice calculated the points n ive got 50 in ord as opposed to a guaranteed fail at higher

G_Foster

So yeah, there I was, dreading this exam! That + English 2 = Horrible day for me! But when I sat down, I was pleasantly surprised looking over the paper...

Didnt have a clue bout the chromatography/steam distillation experiment, but the other two were fairly handy, especially the titration, that was my top prediction so had it learned pretty well! (P.S I think the acid in ant stings is commonly known as Formic Acid, our teacher told us that just before we went in, which was a weird coincidence ^^)

And what was up with 11B? Seems like a new type of question to me, but i thought it was so so easy! Hopefully a nice 25 marks for me! (Unless i got it completely wrong, which would be just like me )

delta214

Awww poops. I put propene too ahh well.
Im hopin for a c1, I thought it was a real nice paper, if i had studied at all id say i wouldve gotten around a b1.

Calorimeterman

I did pretty much all the calculations ( and took the liberty of writing them down on my exam paper). I don't think many other people would have done the same, but I got the theory pretty much perfect and the calculations are the only bit which may let me down.


Q1
moles per litre- 0.0906
grams per litre- 5.436
% w/v- 5.436%

Q2
why would anyone even dream of doing that question?? baffles me...

Q3
instantaneous rate- 5.128 cm3 per minute
total mass 0.104g

Q6
Thermochemistry calculation- (-)1368 kj per mol

Q6
Equilibrium constant- 46.24

Q8
pH # 1- 0.3
pH # 2- 2.5

Q 11 b)
Sooo... easy
i 1144 g
ii 26 mol
iii 624 L
SUV- 1152

Please speak up if any of them ring a bell, they are pretty much what my A lies on!!!

Thomas_S_Hunterson

Michellenman wrote: »

Ascorbic acid, whatever that is, it's possible i made it up though.

It's Vitamin C actually:p

delta214

1,6, and 11b are the same as what i got.
Although for 11b) the last part was how much MORE litres of CO2

G_Foster

I got pretty much the same calculation answers as you Calorimeterman,
Q1, Q3, Q6 and Q11B were (from what I remember) exactly what I got! Unless we're both wrong :S Didnt do Q8, but for the equilibrium, I got an answer of 11-point-something :O Altho much more of a chance of you being right, I'm fairly bad at the aul equilibrium calculations myself! Hehehe..

Michellenman

Sean_K wrote: »

It's Vitamin C actually:p

There's my junior cert home ec coming back to me!:p

pocket aces

Calorimeterman wrote: »

Please speak up if any of them ring a bell, they are pretty much what my A lies on!!!

almost all of them ring a bell

Adventure

Methanoic acid for ant bites right?

G_Foster

Yup, Methanoic acid (or Formic Acid) is the carboxylic acid found in ant stings Hope they accept formic acid, as i couldn't remember the systematic name for it

Parsley

Calorimeterman wrote: »

Q1
moles per litre- 0.0906
grams per litre- 5.436
% w/v- 5.436%-

Yeeup.

Calorimeterman wrote: »

Q2
why would anyone even dream of doing that question?? baffles me...

Cos it was a piece of piss!

Calorimeterman wrote: »

Q3
instantaneous rate- 5.128 cm3 per minute
total mass 0.104g

Yup, but I got around 5.6ish.

Calorimeterman wrote: »

Q6
Thermochemistry calculation- (-)1368 kj per mol

I forgot how to do it...

Calorimeterman wrote: »

Q6
Equilibrium constant- 46.24

Ohhh yeeeah!

Calorimeterman wrote: »

Q8
pH # 1- 0.3
pH # 2- 2.5

Mmmhmm. :cool:

G_Foster

Hey, I see a few people are getting an answer of 46.24 for Kc in Q7, could someone explain to me how? I got 11.56, which is a quarter of this... I'm fairly confused! I probably screwed up, just don't know where, any help is appreciated!

Turquoise

Calorimeterman wrote: »

Q1
moles per litre- 0.0906
grams per litre- 5.436
% w/v- 5.436%

Q3
instantaneous rate- 5.128 cm3 per minute
total mass 0.104g

Q6
Thermochemistry calculation- (-)1368 kj per mol

Q6
Equilibrium constant- 46.24

Q8
pH # 1- 0.3
pH # 2- 2.5

Q 11 b)
Sooo... easy
i 1144 g
ii 26 mol
iii 624 L
SUV- 1152

Please speak up if any of them ring a bell, they are pretty much what my A lies on!!!

I wrote mine down too, always do...but our first one is different. In Q1 I got 0.11 moles originally. Is it not (25 x 0.1)/22.65 rather than (22.65 x 0.1)/25 ? I'm confused now - eek!

My instantaneous rate was 4.4, but I'll admit it's not my strongest question, so yours is probably right.

Thermochemistry and Equilibrium are exactly the same. As are Q11.

starkinter

I also got 0.11 moles for the ethanoic acid, hence 6.6% w/v.

I wasn't sure for the eqm. constant, I panicked in a small way. I think what I finally had was 46.24 crossed out and 11.56 written after it.

People are always saying you get marks for crossed out correct answers, but I doubt that's actually true in this case, is it?

Undergod

Hmm, I got 46.24 as well, but I couldn't get the method in the book to work, I made up my own method on the spot, based on the Law of Conservation of Mass. It was mathematically and scientifically sound though, so hopefully it'll satisfy them.

I have also been told (by teachers) you can get marks for crossed out answers but I'd say that only applies sometimes.

starkinter

Undergod wrote: »

I have also been told (by teachers) you can get marks for crossed out answers but I'd say that only applies sometimes.

Let's just hope that this is one of those cases so, because the rest of that question went grand.

Do they ever not ask you to define Le Châtelier's Principle?

Heretic

I was really disappointed with the paper. I was hoping to get an A. I studied for so long and the paper was really hard I thought. I hope I get a B anyway... I got 0.11 M/L for the vinegar too. Was the coulor change for phenolphthalien colourless to pink as the base was in the conical flask? In the ethene Q I was stupid enough to think they asked for the structural isomer of an alkane... I knew the ones for Butene. 12 marks gone down the drain...

Undergod

No, that's always on the paper, every year, as is electronegativity.

Jayeire

It's over! thats what I think

I'm not gonna analyse what I got right/wrong now, I don't see the point... it can't be changed... so why upset myself :cool:

Chem = done & dusted

Calorimeterman

It was a nice paper, I can see most of you got the same answers as me, which is reassuring.

I made a couple of niggly errors, but that's going to happen in every exam, I just hope they don't accumulate to more than 40 marks...

I'm glad I did pH as an extra question, it was surprisingly easy (way easier than the organic experiment or even the general organic question).

I also noticed that they were offering less marks for the same old stuff, like the structural formulae were only 3 marks each as opposed to 6 in previous years...

Ah well, it's all over, until I do it in college next year...