my chem/biology/physics preds + tips

salman85

chemistry

#1st question = bleach/iron tabs
#2nd question = clove oil/ethyne
#3rd question = temprature + rate
#4th question = random stuff + moseley/mendeleev/alpha+beta/highly likely
#5th question = sigma + pi, (in benzene) know your orbit/orbital/eng levels
#6th question = synthesis delta H (delta tetha) calculation heat of combustion/formation
#7th question = question 7-9 highly likely to be water treatment + acid/base + equilibruim
#10 question = hess' law, gases
i dont know about Q11-12 but i dont really care my self either cuz if u know all this its guarnteed a good B

physics
experiments

A proportional to F
boyle's law
getting refractive index solid/liquid
one of the 2 resistance experiments are a definate
if you know these then its highly likely that you will be able to answer all 3

for normal questions these things i wouldnt go in without knowing
KNOW UR OPTION
learn all formulas + definitions
know all the neuclear stuff
learn electricity stuff very carefully (easy to get marks)

if ur going for a B its really easy
know pracs, do question 5, 10 and 11, do the electricity one and one from the "do 2 parts" question. (any other sugestions are welcome)

biology
im **** at biology but any way what im doing is learning unit 1 and 2 + all experiments + female reproduction and nervous system

long questions
ecology
genetics
respiration/photosynthesis (dont chance ur arm learn both i'd say)
and female reproductive is a definate

so here another FREEBIE B

feel free to add stuff i'll edit if u want me to

jediyoda

salman85 wrote: »

chemistry

#1st question = bleach/iron tabs
#2nd question = clove oil/ethyne
#3rd question = temprature + rate
#4th question = random stuff + moseley/mendeleev/alpha+beta/highly likely
#5th question = sigma + pi, (in benzene) know your orbit/orbital/eng levels
#6th question = synthesis delta H (delta tetha) calculation heat of combustion/formation
#7th question = question 7-9 highly likely to be water treatment + acid/base + equilibruim
#10 question = hess' law, gases
i dont know about Q11-12 but i dont really care my self either cuz if u know all this its guarnteed a good B

Where exactly is your organic long question and your fuels/thermo one?

also there isnt a question 12 so itd be hard to predict anything for it

lovechem

I've heard that this year equilibrium may come up as a full question this year! Iron tablet titration too. Well that or Ethanoic acid. They'll pick a titration with lots of maths if they put on Ethyne/Ethene in Sect.A.

pocket aces

salman85 wrote: »

chemistry

#1st question = bleach/iron tabs
#2nd question = clove oil/ethyne
#3rd question = temprature + rate

those experiments would be amazing....

lovechem wrote: »

They'll pick a titration with lots of maths if they put on Ethyne/Ethene in Sect.A.

either that or pick a harder question 3

lovechem

Ya thats it. Apparently they wouldn't ask the clove oil one cause there is not much to ask about it! Anyone hear anything about chromatography exps coming up? A rates question would be sooooooooooo good.

Industrial or Environmental Chemistry? I'm thinking industrial going by the pattern(every second year), but then again the environment is really topical.

salman85

12th question poped up cuz i was thinking ahead for physics LOL

and you can get asked a good whole question on clove oil

safety precautions (highly likely)
state uses of steam trap/safety tube (highly likely)
uses of aromatic hydro carbons (highly likely)
why use whole cloves and not ground
colour etc of eugenol
structure of benzene (sort of question 5 or organic thing)
draw the aparatus (likely)
describe the procedure (unlikely)


i dont think chromatography will come up because it came up few years back

temp + rate has a graph (hint hint i heard the examiner likes graphs and organic, hes a cork man)

ethanoic acid is way too easy i think and it has appeared not that long ago

bleach is there 90% chance
or else iron tablets.


this will be the organic question (likely) or 2 questions
ionic adition
draw/name planar compunds
isomers
aldehydes vs keytones
synthesis (conversions)
something on the lines of addition/elimination and reflux

thermo will have hess' law and may be question 10 on esters
question 11
photo dissociation of ozone/nitrogen and oxygen/residence time

Adventure

Bleach WILL NOT come up.

Why?

it's a sodium thi/iodine titraton.
A thio titration came up last year and all the q's asked on it are exactly the same as the possible q's on Bleach. eg Why was acidified KI used? etc.

Redox titration more likely.(iron tablets or KMnO4/Fe(II) Sulphate)

Acid/Base usually for ordinary level

But they could suprise everyone with a water titration..

For organic , Ethyne or Ethanal

Other - Relative molecular volatile liq. or a Rates of reaction one

Yuugib

Ho ho what about ethene rather than ethanal? and benzoic acid as well?

nisey89

yea i think iron tablets will come up because the same type of question as bleach came up last year. clove oil , benzoic acid, ethene/ethyne........

what do you all think will come up in Q5??

littlneutralone

Adventure wrote: »

A thio titration came up last year and all the q's asked on it are exactly the same as the possible q's on Bleach. eg Why was acidified KI used?

Oh that's something I meant to find out - why is it acidified? Since there's no Fe or Mn in that titration..

My teacher said Q5 may focus on Ionisation energy since they like it a lot and didn't ask much last year.

lovechem

KI isn't acidified is it? Sulfuric acid is added to the conical flask with the K & KMNO4 to provide H+ ions for the reaction. The KI provides Iodine with I- ions to be converted to I2 and it keeps the I2 in solution.

Or am I wrong

oh god im confused

Adventure

littlneutralone wrote: »

Oh that's something I meant to find out - why is it acidified? Since there's no Fe or Mn in that titration..

My teacher said Q5 may focus on Ionisation energy since they like it a lot and didn't ask much last year.

It provides the H+ for the reaction to proceed ( I think?)


Q5 - i'd say Ionisastion Energy trends or periodic table , mendeleev/mosely/ newlands etc..... mass spectrometer seems due up also.

littlneutralone

But in the other titrations, doesn't it complete the reaction in the sense that it prevents MnO2 being formed..complete oxidation from Mn+7 to Mn+2..and when there's iron, it prevents formation of Fe+3..but in this one it's just bleach and Na-2-S-2-O-3..

Let's just hope this day next week is a happy one

lovechem

littlneutralone wrote: »

But in the other titrations, doesn't it complete the reaction in the sense that it prevents MnO2 being formed..complete oxidation from Mn+7 to Mn+2..and when there's iron, it prevents formation of Fe+3..but in this one it's just bleach and Na-2-S-2-O-3..

Let's just hope this day next week is a happy one

and KI

nisey89

great thinking people!!! for biology who thinks the heart .....senses........sexual repo in plants will come up???

lovechem

IAA experiment has never come so that might appear!

jediyoda

benzoic acid is a real player in the chemistry paper

vol analysis iron tabs is probs front runner

wuldnt be suprised to see steam or ethanl there either

shouldnt be the hardest exam will be lookin for top marks!

nisey89

jediyoda wrote: »

benzoic acid is a real player in the chemistry paper

vol analysis iron tabs is probs front runner

wuldnt be suprised to see steam or ethanl there either

shouldnt be the hardest exam will be lookin for top marks!

Is there any chapters in chemistry we could leave out...........like radiation?? ionisation energy for a full Q5 i think and industrial chem... mabe ozon layer stuff? last years paper was pretty hard so hopfully we'l get a nicer one!! HPLC and UV and IR chromatography as a part of Q11 mabe??

LCFin.yay

lovechem wrote: »

IAA experiment has never come so that might appear!

Eeeek whats an IAA experiment??

plus I'm leaving out chromatography because I simply never liked it... lol

hippety-pippety

the IAA experiment.. i only realised it existed last week, i must have missed the day we did it. its rly horrible experiment, this complicated dilution of IAA, i stil cant rly get my head around it or how to explain it
sorry that wasn't very helpful

Agent Smith

biology - girls have innies, boys have Outties

LCFin.yay

IAA better be biology! hahahaha

because its not in my book

Parsley

LCFin.yay wrote: »

IAA better be biology! hahahaha

because its not in my book

It'd want to be, cos I don't have a ****ing clue what it is!

lovechem

its biology :pac:

Parsley

Phew!

W.Shakes-Beer

Adventure wrote: »

It provides the H+ for the reaction to proceed ( I think?)


Q5 - i'd say Ionisastion Energy trends or periodic table , mendeleev/mosely/ newlands etc..... mass spectrometer seems due up also.

Im pretty sure that in the case of Bleach, the KI provides I- ions:D

im guessin: Q1- Iron tab/Bleach(hasn't been up yet)
Q2- Ethyne/Clove Oil(hasn't been up either)

good luck

nisey89

What do you think will come up in question 3?? cos most the exp predictions are on the first 2Q! i dont think rates will come up because there was a long Q on that last yr with a graph?? so mabe benzoic acid or chromatography

Amarie

What do you think will come up in biology and physics??? I really need to know questions....help-help-help....:(
I'm not doing chemistr,so i need biology and physics only...Please help....

salman85

nisey89 wrote: »

What do you think will come up in question 3?? cos most the exp predictions are on the first 2Q! i dont think rates will come up because there was a long Q on that last yr with a graph?? so mabe benzoic acid or chromatography

yes but if they dont give a question in exp they will give a question on it in the long questions to do with surface adsorption and inter mediate theories etc

practicle is more likely because look at it this way

2 organics (q 6 and 7)
question 8 or 9 one of them HAS to be eq
the other one is HIGHLY likely to be water (and not reactions because of the probablility of it comming up in question3)

jessie11

biology...

id go for respiration exp...photosynthesis experiment was last year.
senses havent been on higher at all so learn them and same wit osmosis experiment

dna
genetics
reproduction
ecology
photosynthesis

jediyoda

nisey89 wrote: »

What do you think will come up in question 3?? cos most the exp predictions are on the first 2Q! i dont think rates will come up because there was a long Q on that last yr with a graph?? so mabe benzoic acid or chromatography

something like benzoic acid or volitile liquid/ the winkler?