!! LC Chemistry '16 HL - Before and after ...

lc16_

Hey guys, I was just wondering would it be safe to leave out the experiments that were asked in last years paper, same goes for the Q5 (Bohr&Rutherford exp) ?

Thanks!

Corkalex

Gonna skim over the stuff that came up last year but wouldn't skip it

Bangdiggy

lc16_ wrote: »

Hey guys, I was just wondering would it be safe to leave out the experiments that were asked in last years paper, same goes for the Q5 (Bohr&Rutherford exp) ?

Thanks!

Since it's a new examiner she might decide to put up something from last year(maybe, you never know) so I'd say know it

TMJM96

Not a LC Chem student but...

Don't "skip" topics that showed up last year, skim over it as a minimum. The SEC like repeating topics, especially if it was answered poorly the previous year.

Bangdiggy

I am soo scared for the experiments no matter how much time I do them, I always forget (organic expt)

pseudorachel

I'm betting the clove oil experiment will come up because they added a new part to it last year that's never been tested yet.

Bangdiggy

pseudorachel wrote: »

I'm betting the clove oil experiment will come up because they added a new part to it last year that's never been tested yet.

what part do you know?

cuprugby333

pseudorachel wrote: »

I'm betting the clove oil experiment will come up because they added a new part to it last year that's never been tested yet.

That new part being?

luftmensch

cuprugby333 wrote: »

That new part being?

Isolating the clove oil from the emulsion by solvent extraction is new. Before, we just had to know how to extract clove oil from cloves by steam distillation.

pseudorachel

cuprugby333 wrote: »

That new part being?

The first part is getting the clove oil and collecting the white emulsion.

the second part is separating the clove oil and the steam using liquid-liquid extraction with cyclohexane

cuprugby333

pseudorachel wrote: »

The first part is getting the clove oil and collecting the white emulsion.

the second part is separating the clove oil and the steam using liquid-liquid extraction with cyclohexane

Oh right I didn't know that was only added this year. Thanks

luftmensch

cuprugby333 wrote: »

Oh right I didn't know that was newly added. Thanks

Not only that but they took out a few experiments as well. My book is quite old, so I'm not sure which experiments I need not bother learning

cuprugby333

luftmensch wrote: »

Not only that but they took out a few experiments as well. My book is quite old, so I'm not sure which experiments I need not bother learning

I do titrations and organic Chem exp and generally avoid the q3s so can't help you there. But I think I have an updated book if the liquid-liquid cyclohexane extraction is in it

pseudorachel

Are any of ye doing the option?

emersyn

Does anyone know the answer to this question from my mock? I know it's probably a simple answer, I just can't get my head around what they're asking and my book isn't helping: "Name the series of coloured lines in the line emission spectrum of hydrogen corresponding to transitions of electrons from higher energy levels to the second energy level"

cuprugby333

emersyn wrote: »

Does anyone know the answer to this question from my mock? I know it's probably a simple answer, I just can't get my head around what they're asking and my book isn't helping: "Name the series of coloured lines in the line emission spectrum of hydrogen corresponding to transitions of electrons from higher energy levels to the second energy level"

Balmer series I believe

Bazinga_N

For anyone wondering, here's a quick guide to the changes to the chemistry course:

http://www.gillmacmillan.ie/AcuCustom/Sitename/DAM/060/LSMS_Chemistry_Changes_to_the_Experimental_Work.pdf

Bangdiggy

emersyn wrote: »

Does anyone know the answer to this question from my mock? I know it's probably a simple answer, I just can't get my head around what they're asking and my book isn't helping: "Name the series of coloured lines in the line emission spectrum of hydrogen corresponding to transitions of electrons from higher energy levels to the second energy level"

I had the same pre, it's Banner series

LordHypnos

predictions on what organic exp. will come up? reckon clove oil has a good chance as pseudorachel said on the previous page.

A97

EDIT: I just checked the curriculum and it appears that the Balmer series is the only one you need to know the name of.

I'm not too familiar with the Chemistry curriculum as I didn't do it for LC, but if an electron moves from a higher level to the 1st one, it's called the Lymann Series (produces UV light), higher level to 2nd level is called the Balmer Series (produces visible light), and higher to 3rd is called the Paschen Series (produces Infrared light).

Seaaan

pseudorachel wrote: »

Are any of ye doing the option?

I'm doing atmospheric and the one about the factory in.. Uh.. The one that makes the furnace linings (I can't even remember what is)

juniorcert

Anyone else dreading this? Chemistry's by far my worst subject and it's my last test as well so probably going to end the leaving cert on a down note

lc16_

Section A; (experiments my teacher has predicted)

Q1) Iron Tablets
Ethanoic Acid
Or Ethene/Ethyne

Q2) Clove oil
EDTA

Q3) Rates of reaction; hydrogen peroxide
Heat of nuetralisation
Anion tests


P.S. Can Le Chatelier's Principle exp come up in Section A?

lc16_

juniorcert wrote: »

Anyone else dreading this? Chemistry's by far my worst subject and it's my last test as well so probably going to end the leaving cert on a down note

Its my last exam too. It'll be hard to stay concentrated for the full 3 hours knowing its the last one but just remember it'll be all over after that so give it your all
You've got plenty of time between now & Tuesday to polish up on the definitions, theory & calculations so dont be dreading it, you'll be grand

emersyn

I have two more exams after Chemistry I'm on a week-long break from Wednesday to next Tuesday, then four exams in four days, can't wait

LordHypnos

lc16_ wrote: »

Section A; (experiments my teacher has predicted)

Q1) Iron Tablets
Ethanoic Acid
Or Ethene/Ethyne

Q2) Clove oil
EDTA

Q3) Rates of reaction; hydrogen peroxide
Heat of nuetralisation
Anion tests


P.S. Can Le Chatelier's Principle exp come up in Section A?

I'm assuming that's the acid base titration for ethanoic acid and not the organic preparation of ethanoic acid since that's off the course.

doubt Le Chatelier would come up in section a but I would expect equilibrium to feature somewhere on the paper

Bazinga_N

lc16_ wrote: »

P.S. Can Le Chatelier's Principle exp come up in Section A?

I mean there's nothing to say it can't but it's been reduced from three tests to one now and I really don't think there's enough for it to come up in A, but I'd say it'll be a part of the equilibrium long question.

alaandocs

lc16_ wrote: »

Section A; (experiments my teacher has predicted)

Q1) Iron Tablets
Ethanoic Acid
Or Ethene/Ethyne

Q2) Clove oil
EDTA

Q3) Rates of reaction; hydrogen peroxide
Heat of nuetralisation
Anion tests


P.S. Can Le Chatelier's Principle exp come up in Section A?

Ethene/ethyne won't come up in Q1 as its organic. It might have a chance in q.2 or somewhere else on the paper. Same with EDTA, it won't come up in q.2 but might in q.1.

The Le Chateliers exp. would probably be in section B as it has never come up in section A along with the redox ones but bits have in section B. That's not saying that this year will be the same they could put them in if they wanted, you wouldn't know.

lc16_

alaandocs wrote: »

Ethene/ethyne won't come up in Q1 as its organic. It might have a chance in q.2 or somewhere else on the paper. Same with EDTA, it won't come up in q.2 but might in q.1.

The Le Chateliers exp. would probably be in section B as it has never come up in section A along with the redox ones but bits have in section B. That's not saying that this year will be the same they could put them in if they wanted, you wouldn't know.

yeah, I got ethyne, ethene & EDTA mixed up in the questions! Thanks

And alright, cheers!

BrownTrout

emersyn wrote:

Does anyone know the answer to this question from my mock? I know it's probably a simple answer, I just can't get my head around what they're asking and my book isn't helping: "Name the series of coloured lines in the line emission spectrum of hydrogen corresponding to transitions of electrons from higher energy levels to the second energy level"

Higher to 2nd is Balmer
Higher to 1st is Lymen
Higher to 3rd is Paschen

hurler97

lc16_ wrote:

P.S. Can Le Chatelier's Principle exp come up in Section A?

Yes it can and it would more than likely appear on Q3