Chemistry

munkeehaven

anyone have any pointers or suggestions on this subject? its the last exam for me so i want to finish happily...i have studied a ton but i still have loads to do.....there was a lot of fuss made about the exam last year when a qt came up that wasnt even on the syllabus...so maybe this year they will be gentle on us...its almost as unpopular as physics..i wonder why??....... im stilll a bit bruised after biology but you gotta keep on trucking....{/B]




the 3 worst experiments came up last year hip hip hooray!! i hate the iron tab and the volatile liquid one!!!!:D

munkeehaven

..... has anyone actually managed to do all the sample papers?? i was doing some on organic chemistry and theres a few with some weird mistakes..--namely edco papers page30 QT6 what the hell is the middle one-- CH2OHCHOHCH2OH--THAT DOESNT BLOODY EXIST!!!--but i think its an ester misprinted.sorry for nitpicking but chemistry is a nit-picky science

***************************
here are some of my suggetions for the exam, from doing a bit of DIY statistics and analysing.............

EXPS 2003--1)IRON TAB 2)ETHYNE GAS 3)VOLATILE LIQUID
EXPS 2002--1)ETHANOIC ACID 2)SOAP 3)EFFECT OF CONC. ON RATE OF REACTION

***************************
FINDINGS:
*** there have been no full questions in the last two papers about gases (theory or formulae), or on acids--Ka Kb, Kw of water etc (the harder chapter)

*** there have been no full questions on options (just half ones scattered higgeldy-piggeldy)...and these have been on atmosphere--o3,green houses gases etc(for those doing that option ) ...so maybe industrial chemistry--case study is up for a chance?

***no qt on electrolysis either in the last two years so maybe...(hopefully not)

Cannibal Ox

Whoa...mind laying off the bold please?

munkeehaven

sorry its my personality .....i skinny letters......:p

munkeehaven

oops..... i ***hate skinny letters

PrecariousNuts

I saw the papers

**te*, *er****as*** and **h li**d are coming up as the experiments. The long questions are **det**, orga**c and mostly ***ds and b***s.

penguincakes

CH2OHCHOHCH2OH--THAT DOESNT BLOODY EXIST!!!--

Yes it does. It's glycerol, a tri-alcohol

  H H H
  | | |
H-C-C-C-H
  | | |
  O O O
  | | |
  H H H

Suaimhneach

I dropped this bítch of a subject!!

munkeehaven

aha ! so thats how you can make soap from it ! thanks for that...was driving me spare....

munkeehaven

its a bi-product of making soap--how did i forget that?...man i hope that doesnt come up i can never remember that exp.....

Cathy

Originally posted by PrecariousNuts
I saw the papers

**te*, *er****as*** and **h li**d are coming up as the experiments. The long questions are **det**, orga**c and mostly ***ds and b***s.

What?

PrecariousNuts

Sorry, it was supposed to be a parody of this

oops..... i ***hate skinny letters

I still can't figure out an obscene word ending in hate

Cathy

okay... excuse my slowness, but I've been running around after kids all day and I am wrecked. And now I need to go and study Chemistry and Physics...


Maybe shate? ****e pronounced in a very accenty accent?

munkeehaven

ill tell what the word is --its kinda a weird word i use in daily speech its i f**kinihate--i tend to make up words----

PrecariousNuts

Yeah I'm in a panic over physics and chemistry being monday and tuesday. I've been super relaxed since all my exams bar the first few have had several days in between for studying. I did the electricity/magnetism chapters today, chemistry tomorrow then physics on sunday. Hopefully it will be straight forward as usual. I'm banking on A1s in both

munkeehaven

chemistry is one of those subjects where you can just go blank...i did fairly medicore in my my mock exam simply because i became a bit pompous and thought i had it sorted --so since then and now i have done a tonne and nearly did every qt in the exam papers--but i forget things so easily!!--well mostly the chapters im not fond of like gases and ionic trends

munkeehaven

****e two more days left to cram.......cripes i wonder can i leave out electrolysis and/or the option........both of them are so long for such little marks ....

claire h

Originally posted by munkeehaven
****e two more days left to cram.......cripes i wonder can i leave out electrolysis and/or the option........both of them are so long for such little marks ....

Yeah, you could, if you've covered everything else. Only 6 questions out of 8... and only 5 if you do all three experiments.

penguincakes

Originally posted by munkeehaven
****e two more days left to cram.......cripes i wonder can i leave out electrolysis and/or the option........both of them are so long for such little marks ....

The option only seems to be a half question, and maybe a part in q5. It's an option, therefore it's not necessary to do it, so yes you can leave it out. Electrolysis... Meh I don't know it properly yet. Good idea actually, that's something for me to study now...

munkeehaven

i hate electrolysis its very un-chemistry like in my opnion..i like the real hard core stuff like organic chemistry ans ox-reduction........jeez i should be doing it know but....do you think it would be safe to leave out the exps from the last 2 papers or could they do the dirt on us???

penguincakes

Well there tends to be a question in section B that has to do with a mandatory experiment (in q 4 or one of the half-questions) & they could well ask about one that's come up before there to catch you out. Especially since you've gone & said it out loud, too.

munkeehaven

heeh hee as superstituous as me then...:pwell i have tried to do chem as much as possible but i still am a bit vague on the exps......its just a lot of them are so similiar..its the harder ones i find easier to remember because they are more specific...titrations just are so alike....and i HATE that colorimeter exp

Stalin

^^^^Yeah i am defo ,but they half kinda come up in section B like little tiny Qs on them.

munkeehaven

chemistry is really sneaky..i was pissed off with my pres results .... but i just panicked in the exam and forgot how to do simple things and ended up losing stupid marks.......i think with chem it can just seep away from your memory without you knowing so you have to go over stufff CONSTANTLY...

Stalin

^^^true...looking back at my mock , i have written stuff that i dont even know now...What are the main things to cover in the exam??

munkeehaven

i think organic chem is a BIGGIE you can have up to two org exps and 3 long qts......and also id say gases are imp cos they havent been asked yet..and the harder acid chapters(with all the calculations)...equilibrium.....and must know totally well--all the first chaps-- you know---periodic table,bonding,trends etc

the_viper2kie

As an A1'r from last year lads the advice i can give you is to do all the questions...i know it sounds crazy but you have sooo much time all the questions only require very definite answers dont bother your arse dressin it all up...its my experience that in science based subjects the person correcting your paper will be very pisssed of reading a chemistry/dickens script with the sun beating in on them when they could be off doin somethin better!! if you do this and answer all the questions they will be impressed and you'd be surprised where they can give ya marks when you didn't really deserve them!! i know its a bit late telling you this but the leaving cert is a system....and with every system there is a way of playing the system!!
in english for example i went in and answered all the questions i knew no1 else would(Frost when the whole country did heaney and Plath)...got an A2 when i had never gotten over 50% in my life!!

Play the system and you will be rewarded....My chemsitry teacher told us the week before we went into our exam that she never even did chem in college!!!ultimate confidence boost-biggest B**ch in the world...

Best of Luck

munkeehaven

thanks...i hope i do get on well cos all i really like is science and philosphy and i think science is a bit more probable as a college course---well i want to do biomedical science so its a bit of bio and chem which i love!!

the_viper2kie

yeah, i'm doin chem engineering but will prob head down biochem route in a few years...PHD in America oh yeah baby...The leaving cert chem course is an absolute joke tbh, we did most of it in 2 months in college and about 60-70% of people never did chemistry before...very east stuff..Get some small cards and write out all the reactions on them, even draw little diagrams of the aparatus and just leave them in your back pocket for next few days...look at them whenever you have a spare minute i guarantee you when you go into the exam you'll see your cards in your mind and copy everythin down...
And remember they love diagrams...draw them everywhere even when not asked...picture is worth a thousand words!! if you leave sometin out in your description but theres a reference to it in your diagram they;ll give you a few marks..

munkeehaven

i hope to do research or something but i know these days research is so bloody corrupt you have to get sponsored usually by some big company and they tell you exactly what to do...i would love to just be able to do research into aids or cancer or something useful without having some multinational gnawing at my back....

munkeehaven

well i suppose i should go now and actually do some study...man the amount of time i spend here...:dunno: ...ill be back on mon night to panic!!!!

c0rk3r

This is what i'll be given priority to over the next day or so.

Section A

(1) Soduim Thiosulphate and Iodine Titration (using Potassium Manganate as an oxid agent to liberate Iodine forom excess Potassium Iodide)

(2)Bleach Experiment, hypochlorite ions etc.

As regards the organic experiment in section A,anything may appear.

Section B

Im Focusing on;

Atomic Theory Chapters
The Six organic Chapters
My option
Water
Acids and Bases
The Gas laws
Thermochemistry
Equilibrium

NB*In the mocks in my school the major loss in marks came from not knowing the definitions.Every question usually opens with "Define" [insert Q here].At least 5 marks goes for this question.So.... a loss of 5 marks in every question can have a major impact on your grade.

good luck.

munkeehaven

that looks pretty concise ---but dont forget gasse i have a feeling they are going to come up.........and they are some fecking hard qts on that......

CuLT

Doesn't look too concise to me, his section b revision looks like most of the course.

And don't you think you're somewhat putting all your eggs in one basket by only doing the two Iodine expmts?

c0rk3r

Originally posted by c0rk3r
This is what i'll be given priority to over the next day or so.

Im not leaving out anything.Just giving priority in oder of importance according to Tara lyons.

To get full marks you need to know the entire course.

munkeehaven

im just after revising organic and i still have a ton to do....ill do more tomorrow and then get up at 7 and study for about 4 hours before the test...itll be my last exam so hopefully i will survive on the adrenaline and the big bowl of porridge

CuLT

Originally posted by c0rk3r
Im not leaving out anything.Just giving priority in oder of importance according to Tara lyons.

To get full marks you need to know the entire course.

Were you in the institute this year?

Because if you were, we have different information.

c0rk3r

Yup, was in your classics class aswell.

This is what ive got hand written on the back of my Volumetric Analysis notes.

Acid/Base

(1)Standardisation of a Hcl solution using a standard solution of Sodium Carbonate

(2)Determination of the concentration of ethanoic acid in vinegar.

Redox

(3) Postassium Manganate (VII) and Ammonium (II) Sulphate Crystals.

(4)Determination of the amount of iron in an iron tablet.

Redox

(5)Sodium Thiosulphate and Iodine Titration

(6) Bleach

Terms of calculations

2,6 (%w/v)
1,3,5 (%water of crystallisation)
3,5 (could be %purity)
4 (unique)
2,6 (Dilution factors involved,undiluate at the end)

________
| 1, 3, 5 | Likely number 5
|_______| Second Contender 6

Smellyirishman

Took a while for this to come to the top today, obviously people arent too worried about chemistry!!

Im just gonna run over everythin and get whatever! I dont care! All I need is a pass and I got 55% in my mocks and that was rushed so I *should* be OK but im not running any risks and so ill just run over everythin cause I aint done ANYTHING in about 3-4 weeks

claire h

Originally posted by Smellyirishman
Took a while for this to come to the top today, obviously people arent too worried about chemistry!!

Or else too busy trying to learn off everything...

munkeehaven

im just after finishing art today so now its crunchtime!! i am worried because i want to do realy well .....ill start studying in around an hour and then 2mrw get up fairly early so that the info will be fresh in my head...this is weird--my mum said she heard on the radio that they say its good to watch telly before an exam instead of cramming because it can improve your memory!!---i wonder.........

claire h

Originally posted by munkeehaven
im just after finishing art today so now its crunchtime!! i am worried because i want to do realy well .....ill start studying in around an hour and then 2mrw get up fairly early so that the info will be fresh in my head...this is weird--my mum said she heard on the radio that they say its good to watch telly before an exam instead of cramming because it can improve your memory!!---i wonder.........

I'm sure that has more to do with being relaxed and not trying to cram in any more information so that what you already know will be clearer, rather than any magical powers the television might have.

munkeehaven

yes true true..it is said that your brain emits the same alpha waves while watching telly that it does when you are in a light sleep--basically because your eyes rarely move when watching telly your brain kinda shuts down, thats how you can watch tv for hours and not be aware of the time slipping by

Smellyirishman

Claire H good point, but even people TRYING to learn come on here , I think people are winding down a bit now and know if they have done well enough or know what they need etc...

Me im just wasting around waiting for the match to start and ill prolly end up jamming it all in tommorrow!

P.S ANYONE that says cramming doesnt work is a lier! It may not work long term but my god it does work for useless tests like these!


Oh and anyone got a industry process done with the name of a factory etc cause I lost the one we got I think!

munkeehaven

we did IFI in cobh they are shut down but still on the course...they make ammonia from nitrogen and hydrogen and make fertilisers

munkeehaven

i just have a feeling this year will be GASES i dunno but its a weird gut feeling...i suppose i should go and study now with what ever energy i have left --after art --im so wrecked from getting up early before an exam to cram...it makes my head dizzy:eek:

PrecariousNuts

Anyone know whats going on with the experiments in the chemical equilibrium / oxidation reduction chapters? The really crap ones where you have a million test tubes and you add a bit of something to each one then look at the colour change and write down the million half equations, there is no sums or anything. Do we really need to know them. I just know if I don't they will come up

claire h

Thank god that's over.

BangBeater

Not a bad exam...... I think!

For Q6 - I got heat of formation of methane to be 75.6 kJ mol-1
Any1 else get that??

Q8 - What's the quantity B?!!!!

Our teacher, after it, was saying that pt (d) of Q 8 is actually not a mandatory exp. and therefore should not be there! How many actually got that?!

Oh, yeah, Q4 (h) - got 70% but it could hav been 35% for percentage by mass of iron oxide- any1??

Q9 (e) Got Kc to be 7.1 * 10 to the power of something - any get that?!

Q11 I said limitations of the pH scale was that ngative answers are possible which don't really tell u anything

c0rk3r

b2-b3

not enough organic, stuggled for a question 8.

Just one exam left.

WHO-RA!

munkeehaven

THE MOLAR VOLUME FOR GAS was wrong it said 24 but it should BE 22.4!!!!
how did ye think ye did??? im so f ucking depressed i studied a s hit load but i think i got on sh ite some qts really got to me and i wasnt able to answer them all properly......i feel horrible.....i need to be reassured...its not the way i thought i d end it feeling like this....