[Chemistry] - Challenge for 'O' & 'A' Level Students
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Originally posted by tut4nkh4m3n:
correct. but very roughly, 'A' lvls chem paper is split into 40% organic, 40% physical, 20% inorganic.
I THINK
which shows that maybe inorganic is not so impt (haha, i hate it, boo), but the physical component is crucial, which means you need your basic math. after all, as you said, they can slaughter you with crazy elucidation/organic synthesis questions, which means you may need your physical component to back you up.
There should be analytical chem in ur syllabus.
All the MS, UV, IR, NMR, AAS, ICP etc that you should have learn (not sure how many in the list) are all under analytical chemistry.
As a uni chem student, personally i would say analytical chem is the most impt of the 4 main branches since without analytical chem, most of the experiments/tests done for the other 4 branches cannot be done since almost all of them require the use of analytical chemistry knowledge someway or the other.
Organic chemistry is the largest of the 4 branches especially since organic compounds outnumber inorganic compounds many many times.
Physical chemistry is 1 most uni chemist hate since uni chemist hates physcs (physicist hate chemistry too). Even ultimaonline die die dun wan help me with my physical chemistry topics on thermodynamics and quantum :p
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Originally posted by yiha093:
blehhh , i'll just deal with it as it comes along. yihao leii . dun play play xD
Thats being complacent my boy, O's science is just the tip of the ice berg, very little worthwhile knowledge since half the contents are totally just there to fill in the syallbus and another 1/3-1/2 of the remainder becomes 'wrong' as you go higher level since they use a wrong but easier to understand approach to teach you all.
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Spectroscopy is taught only in H3 Chem, and not in H2 or H1 Chem. As for what you say regarding physicists vs chemists, it's also pretty much true for physicists vs biologists, and biologists vs chemists. BioChemistry, for instance, is a common nightmare for both 'pure chemists' and 'pure biologists'. Interfacing between the multiple sciences (including engineering sciences), is of course, germane to evolving new technologies that can benefit mankind. 'TakChek', a Singporean with a PhD in Science, has found greener pastures elswhere to do his research and development. His work involves the interface and interaction between all 3 Sciences and engineering (so he's a physicist-chemist-biologist-engineer rolled into one), and his blog is worth a read. About doing Science in Singapore http://takchek.blogspot.com/2006/07/about-doing-science-in-singapore.html Biomedical Engineering and US Medical School http://takchek.blogspot.com/2007/01/biomedical-engineering-and-us-medgrad.html
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mmhmm..interesting reads
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Originally posted by dkcx:
Thats being complacent my boy, O's science is just the tip of the ice berg, very little worthwhile knowledge since half the contents are totally just there to fill in the syallbus and another 1/3-1/2 of the remainder becomes 'wrong' as you go higher level since they use a wrong but easier to understand approach to teach you all.
its not . its called bravery and the mindset to push everything in ur path which is blocking u ,-.-''
dude why u everything complacent de =.=
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Originally posted by UltimaOnline:
Spectroscopy is taught only in H3 Chem, and not in H2 or H1 Chem.
As for what you say regarding physicists vs chemists, it’s also pretty much true for physicists vs biologists, and biologists vs chemists.
BioChemistry, for instance, is a common nightmare for both ‘pure chemists’ and ‘pure biologists’.
Interfacing between the multiple sciences (including engineering sciences), is of course, germane to evolving new technologies that can benefit mankind.
‘TakChek’, a Singporean with a PhD in Science, has found greener pastures elswhere to do his research and development. His work involves the interface and interaction between all 3 Sciences and engineering (so he’s a physicist-chemist-biologist-engineer rolled into one), and his blog is worth a read.
About doing Science in Singapore
http://takchek.blogspot.com/2006/07/about-doing…Biomedical Engineering and US Medical School
http://takchek.blogspot.com/2007/01/biomedical-...Only in H3 now? My classmates mentioned they studied it in A's before even thought they study all the theory without knowing what the hell they learning eg Mass spec. Rare to see them reducing the content instead of increasing the content esp when i would say spectroscopy is an important area of chemistry. U cannot work in any chemical industry without that knowledge even if you ace your organic, inorganic and physical chemistry.
I rather to biochemistry than physical chemistry. At least biochem looks more chem than physical chem which is all numbers. Yihao will cry for sure :p
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Originally posted by dkcx:
Only in H3 now? My classmates mentioned they studied it in A's before even thought they study all the theory without knowing what the hell they learning eg Mass spec. Rare to see them reducing the content instead of increasing the content esp when i would say spectroscopy is an important area of chemistry. U cannot work in any chemical industry without that knowledge even if you ace your organic, inorganic and physical chemistry.
I rather to biochemistry than physical chemistry. At least biochem looks more chem than physical chem which is all numbers. Yihao will cry for sure :p
LOL
don't start someth
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Originally posted by yiha093:
its not . its called bravery and the mindset to push everything in ur path which is blocking u ,-.-''
dude why u everything complacent de =.=
If you so brave, you should be FACING your maths and not running away from it :p You need more effort to secure your A1 for ur emaths paper.
Considering how much you don't want do maths, i really wonder why you still want go try H2 maths in JC when you don't even have A maths background. Feel abit like zi xun fan nao.
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Originally posted by tut4nkh4m3n:
LOL
don't start someth
Start what? I been insulting JC syallabus, effectiveness, purpose etc etc for as long as i remember :p
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Originally posted by dkcx:
If you so brave, you should be FACING your maths and not running away from it :p You need more effort to secure your A1 for ur emaths paper.
Considering how much you don't want do maths, i really wonder why you still want go try H2 maths in JC when you don't even have A maths background. Feel abit like zi xun fan nao.
what sia. who say i nvr face ~. ~
i asked the teacher for practice paper okay. thats facing alr.
i just wanna do h2 chem/phy. just that h2maths is a set -.-
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just so you know, i was referring to "Yihao will cry for sure :p" and not the syllabus. i don't like the syllabus.
heh
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dun worry, i already immune to whatever dkcx says. xD
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Originally posted by tut4nkh4m3n:
just so you know, i was referring to "Yihao will cry for sure :p" and not the syllabus. i don't like the syllabus.
heh
If he will listen to me, we won't be only communicating on facebook liao
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Hi guys need help in this qn
‘A’ Level Qn.
What is the amount of AgNO3(s) to be added to 250cm3 saturated solution of Ag2SO4(aq) such that its solubility is reduced to 1.0×10-3 mol/dm3, given that Ksp Ag2SO4 = 1.4×10-5.
Answer :
0.02198 mol.Plz help me!!!
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Originally posted by yiha093:
sorry, but isit possible for TS to post chemistry-related-but-not-maths-related.eg-sim-eqn questions ?
really dislike it ? =.='' ?
dun like 2 mix chem with maths.
You kidding me?At my level now (uni), even though the chemistry module I take is just a for-general-knowledge type, I still have to do a fair bit of differentiation/integration/summation and what-nots.
And oh, Microsoft Excel....I spend a fair bit of time plotting the mixing ratios graphically.
Just do it la.....after a while Maths becomes fun.
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arxoz, Calculate original [Ag+] (based on Ksp). Calculate new [SO4 2-] (based on new solubility). Calculate new [Ag+] (based on Ksp). Calculate [Ag+] needed to be added (ie. the difference). Calculate for 250cm3.
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Originally posted by SBS2601D:
You kidding me?At my level now (uni), even though the chemistry module I take is just a for-general-knowledge type, I still have to do a fair bit of differentiation/integration/summation and what-nots.
And oh, Microsoft Excel....I spend a fair bit of time plotting the mixing ratios graphically.
Just do it la.....after a while Maths becomes fun.
i sec school only ma. so asking la. i dunoe anything. LOL
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Ultimaonline, i did exactly the way u r asking me to do but i am not getting the answer. Why?
Can you post a detailed answer?
thx for ur help.
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Ok, but before I post it, isn't there anyone else here taking 'A' levels that can solve this? I'll give this 24 hours, see if anyone else can successfully work out the answer.
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arxoz, post your step-by-step solutions here. You're probably only a single step off, so post your working here and I'll point out your error/misconception, if any (it's always possible you interpreted the question in an alternative way, and that your answer is arguably also correct).
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arxoz, Calculate original [Ag+] (based on Ksp). 0.03037 M Calculate new [SO4 2-] (based on new solubility). 0.001 M Calculate new [Ag+] (based on Ksp). 0.1183 Calculate [Ag+] needed to be added (ie. the difference). 0.08793 Calculate for 250cm3. 0.02198
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lol when i saw the first line of the qn i tot is some kind of chim chemistry.. but as i read on, onething straight into my mind is that it looks more like math. well, people with little knowledge of Chem can do it.
i'm gonna tell u, this is some kind of real life questions you have to answer . and its more than this..in the industry , its not so straight forward which the questions are given to you. you have to construct your own question given a senario .
poly grad engineering student here.
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It's not merely "in the industry", it's "in life". Every individual must critically question and frame the purpose of his/her life (as opposed to cruising through life aimlessly or blindly, zombie-like, going-along-with-the-crowd, following soceital dogma, meaningless), and decide what the validity, purpose and meaning of his/her life is. What we call, the existential program for a particular lifetime for a particular individual. This isn't something that anyone or anything outside of you (no external authority, government, domineering parent, organization, peers, or religion) can impose upon you (that is, if you're intelligent and have a sufficient degree of self-awareness), but something (ie. the meaning and purpose) that you yourself find higher meaning, relevance and purpose for yourself, something that you choose for yourself at all levels of your soul. You are the captain of your own destiny. Will you be a wasteful captain, or a wise one?
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Since the solution is saturated, the concentration of SO42- is in the solution is0.0152 moldm-3(solubility based on Ksp). So after the addition of silver nitrate, the new concentration of so42- should be 0.0152+0.001.
But in your workings, you did not consider the solution of so42- in the saturated solution. Why?
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Did you consider that some of the SO4 2- ions will LEAVE in the form of Ag2SO4(s) ppt?