!! HL Chemistry 2015 - discussion, guesses, predictions, explosions, etc.

B4nt3rB0t · 03-03-2015 7:02pm #1

Anyone have any ideas?

Deridovely · 03-03-2015 10:38pm

That new phenylmethanol experiment is almost garaunteed I'd say!

WSG 98 · 04-03-2015 5:13pm

Remember to focus on the guaranteed questions listed at the start of the exam papers.

Know your:
1 Organic Theory
2 Organic Experiments
3 History Of Chem / Trends
4 Volumetric analysis
5 Rates of Rxn
6 Equilibrium
7 The Option

dazzadazza · 21-03-2015 1:57am

In the chemistry papers, question 1 is always a titration and question 2 is an organic experiment. Is anyone going to learn all titrations and all the organics and leave out the rest? Is it risky in case they decide to change it this year?

Ima_mokster · 22-03-2015 6:32pm

I highly doubt they'll change the way the do things this year, they've largely kept to the same routine throughout the years, but the titrations + organic alone count 17 experiments, which is still a huge amount! the remainder aren't too bad. I personally hate titrations

dazzadazza · 22-03-2015 6:47pm

Ima_mokster wrote: »

I highly doubt they'll change the way the do things this year, they've largely kept to the same routine throughout the years, but the titrations + organic alone count 17 experiments, which is still a huge amount! the remainder aren't too bad. I personally hate titrations

do people often do that. I.e. Study titrations and organic and leave the rest. I haven't heard of anyone else doing it an it makes me wonder.

Ima_mokster · 22-03-2015 10:16pm

My teacher said he wouldn't recommend it, but understands the logic of it.. the other experiments can come up as part of long questions so will require knowledge of them, but you can always skip that qn.. its up to you at the end of the day! but if you know all the rest you'll be able to answer 2 experiments.

dazzadazza · 22-03-2015 11:33pm

Ima_mokster wrote: »

My teacher said he wouldn't recommend it, but understands the logic of it.. the other experiments can come up as part of long questions so will require knowledge of them, but you can always skip that qn.. its up to you at the end of the day! but if you know all the rest you'll be able to answer 2 experiments.

I don't know I just feel like it would be a lot less hassle. I mean you could have a fair idea about the rest and properly study the titrations and organic.

shoopdeboop · 24-03-2015 8:28am

Well this year is the first that the "Oxidation of Phenylmethanol" experiment is on, and they're fairly likely to ask that (as the organic exp.)

According to my teacher anyway ðŸ˜œ

ko3p · 24-03-2015 6:48pm

A new Chemistry syllabus is ready to be introduced and will be in the next few years, so don't expect any changes in the layout of the paper.

MF290 · 04-05-2015 10:27am

I don't have the solution, hoping someone else will give it a shot to compare answers!

Inspector Coptoor · 04-05-2015 11:48am

What's the question?

MF290 · 06-05-2015 8:36pm

Inspector Coptoor wrote: »

What's the question?

Was going to post a link of the photo, but it says I'm not able to..... not a able to delete post either!

Magnate · 06-05-2015 9:49pm

MF290 wrote: »

Was going to post a link of the photo, but it says I'm not able to..... not a able to delete post either!

Just put a few spaces in the url and we can piece it together

AlfaJack · 10-05-2015 4:52pm

Does anyone know where I can find a full list of experiments for this years exam? Because my friend was saying there's a new experiment (Preparation of benzoic acid) but it's not in my revision book and our teacher never did it with us. I also just want to make sure I have them all covered!

Thank you

owenoneill · 11-05-2015 6:38pm

There should be a list in the introduction section of your exam papers, or google 'LC Chemistry syllabus'.

Inspector Coptoor · 11-05-2015 9:16pm

Oxidation of phenyl methanol to benzoic acid is the name of the experiment

d1234 · 12-05-2015 6:18pm

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

AlfaJack · 14-05-2015 10:08pm

Thank you so much

dazzadazza · 17-05-2015 10:30pm

How does everyone learn chemistry experiments? We haven't done them all. Also I noticed questions in exam papers on experiments that aren't mandatory. (Eg. Sodium Tartate one in the rates of reactions chapter). Do you learn them? There is a new experiment I heard about online but our teacher hasn't mentioned it. Could that come up? I think it's an organic one. I got 78% in my mocks and I feel like the experiments are what's holding me back. I'm looking for an A.

2015lc · 18-05-2015 9:21am

dazzadazza wrote: »

How does everyone learn chemistry experiments? We haven't done them all. Also I noticed questions in exam papers on experiments that aren't mandatory. (Eg. Sodium Tartate one in the rates of reactions chapter). Do you learn them? There is a new experiment I heard about online but our teacher hasn't mentioned it. Could that come up? I think it's an organic one. I got 78% in my mocks and I feel like the experiments are what's holding me back. I'm looking for an A.

I think the experiment you're thinking of is the oxidation of phenylmethanol to benzoic acid. It's fairly likely it will come up! I can't post a link but just look it up and there's good explanations

AlfaJack · 18-05-2015 7:38pm

All about the preparation of benzoic acid is here:
http:// www .gillmacmillan.ie/AcuCustom/Sitename/DAM/060/LSMS_Chemistry_Changes_to_the_Experimental_Work . pdf
(without the gaps)

MmmPancakes · 21-05-2015 7:19pm

Some parts of the chemistry course confuse me too much, electrolysis especially. It's simple in principle but I can never get my head around the cathode - negative - reduction thing

iCrazzy · 23-05-2015 8:42pm

Im having some troubles with this qs.
I get how to calculate the moles and grams and how to find x and the percentage.
But how do they get 1.14.
Dont you usually take away the answer u got in grams with the mass given in question to get percentage?

Inspector Coptoor · 23-05-2015 10:38pm

It says at the start of the question that the crystals of hydrated sodium carbonate weighed 2.5g.
The 1.14g figure is how much of the 2.5g of the crystals is made up of actual sodium carbonate, the remaining mass being the water of crystallisation

Gryffindor · 25-05-2015 7:56pm

Quick question about the hydrated sodium carbonate question.
When you use the (Va.Ma)/na = (Vb.Mb.)/nb to find the number of moles of base.
Is this the number of moles of sodium carbonate or the hydrated sodium carbonate?

Thanks!

Jason_H · 25-05-2015 9:48pm

My teacher says Benzoic acid is unlikely to be question 2 as its far too obvious, but could be question 10/11.

She says organic will be loadsa short questions like 2013

DaveMc90 · 26-05-2015 7:07am

Do you know the way the experiments involving ethanoic acid and ethanal have been taken off the course experimentally , and it does say we still have to know the theory , but does that mean it cant come up in section A but can in section B or can it still come up in section A ?

OMGeary · 26-05-2015 9:11am

DaveMc90 wrote: »

Do you know the way the experiments involving ethanoic acid and ethanal have been taken off the course experimentally , and it does say we still have to know the theory , but does that mean it cant come up in section A but can in section B or can it still come up in section A ?

Think it's just Section B

sdio · 26-05-2015 4:59pm

Gryffindor wrote: »

Quick question about the hydrated sodium carbonate question.
When you use the (Va.Ma)/na = (Vb.Mb.)/nb to find the number of moles of base.
Is this the number of moles of sodium carbonate or the hydrated sodium carbonate?

Thanks!

They are the same thing. 1 mol of hydrated sodium carbonate contains 1 mol of sodium carbonate and x mol of water.

Gryffindor · 26-05-2015 5:08pm

sdio wrote: »

They are the same thing. 1 mol of hydrated sodium carbonate contains 1 mol of sodium carbonate and x mol of water.

This makes a lot of sense thank you!

!! HL Chemistry 2015 - discussion, guesses, predictions, explosions, etc.

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