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Old 7th January 2014, 08:16 AM   #1 (permalink)
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Tips for O/A levels Chemistry students

Hi all,

I have compiled tips for O/A level Chemistry students on my blogs. Hope they may help you.

Thank you for your support over the years.

http://olevelpurechem.blogspot.sg

http://alevelchemistrysg.blogspot.sg

Cheers!



Mr Chong

B.Sc(Hons) in Chemistry, PGDE

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Old 7th January 2014, 09:14 PM   #2 (permalink)
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Re: Tips for O/A levels Chemistry students

Mr Chong posted an OC deductive elucidation qn on his blog :
http://alevelchemistrysg.blogspot.sg...-question.html

A couple of Tips from my BedokFunland JC strategy :

H has the formula C5H10O2, which has 1 degree of unsaturation, ie. 1 double bond or 1 ring (which turns out to be C=C double bond ; there are 2 primary alcohol groups).

H when oxidized by K2Cr2O7 generates I, C5H6O4, which has 3 degrees of unsaturation, ie. 3 double bonds, or 3 rings, or 1 triple bond and 1 double bond, or 1 triple bond and 1 ring, etc (which turns out to be 1 C=C and 2 C=O double bonds ; there are 2 carboxylic acid groups).

H when oxidized by KMnO4 generates M, C3H4O4, which has 2 degrees of unsaturation, ie. 2 double bonds, or 1 triple bond, or 2 rings, or 1 double bond and 1 ring, etc (which turns out to be 2 C=O double bonds ; there are 2 carboxylic acid groups ; oxidative cleavage of I generates two products : M and ethandial which is oxidized to ethandioic acid which is further oxidized to carbonic(IV) acid, which exists in equilibrium with, and hence can decompose into H2O and gaseous CO2, with thermodynamically favourable positive entropy change pulling the position of equilibrium over to the RHS, as predicted by Le Chatelier's principle).

Together with the other information given in the question, we deduce and elucidate the structures to be :

H is pent-2-ene-1,5-diol

I is pent-2-ene-1,5-dioic acid

M is propandioic acid

--------------------------------------------------------------------------------

Visit Mr Chong's blog regularly for updates to more H2 Chemistry goodies :
http://alevelchemistrysg.blogspot.sg/


Last edited by UltimaOnline; 8th January 2014 at 01:14 AM. Reason: BedokFunland JC
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Old 7th January 2014, 10:57 PM   #3 (permalink)
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Re: Tips for O/A levels Chemistry students

Originally Posted by UltimaOnline View Post
Mr Chong posted an OC deductive elucidation qn on his blog :
http://alevelchemistrysg.blogspot.sg...-question.html

A couple of Tips from my BedokFunland JC strategy :

H has the formula C5H10O2, which has 1 degree of unsaturation, ie. 1 double bond or 1 ring (which turns out to be C=C double bond ; there are 2 primary alcohol groups).

H when oxidized by K2Cr2O7 generates I, C5H6O4, which has 3 degrees of unsaturation, ie. 3 double bonds or 3 rings (which turns out to be 1 C=C and 2 C=O double bonds ; there are 2 carboxylic acid groups).

H when oxidized by KMnO4 generates M, C3H4O4, which has 2 degrees of unsaturation, ie. 2 double bonds or 2 rings (which turns out to be 2 C=O double bonds ; there are 2 carboxylic acid groups ; oxidative cleavage of I generates two products : M and ethandial which is oxidized to ethandioic acid which is further oxidized to carbonic(IV) acid, which exists in equilibrium with, and hence can decompose into H2O and gaseous CO2, with thermodynamically favourable positive entropy change pulling the position of equilibrium over to the RHS, as predicted by Le Chatelier's principle).

Together with the other information given in the question, we deduce and elucidate the structures to be :

H is pent-2-ene-1,5-diol

I is pent-2-ene-1,5-dioic acid

M is propandioic acid

--------------------------------------------------------------------------------

Visit Mr Chong's blog regularly for updates to more H2 Chemistry goodies :
http://alevelchemistrysg.blogspot.sg/
After looking at all those complex terms, all I can say is... I think I'm going to be in for one hell of a ride for approximately two entire years

On the other hand, I am really enthusiastic to learn more about it at the same time...hopefully the enthusiasm doesn't dissipate.

Is Wikipedia reliable enough for finding out more about these, may I ask?

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Chemistry Resources : alevelchemistrysg.blogspot.sg

Last edited by AlphaEternalα; 7th January 2014 at 11:03 PM.
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Old 7th January 2014, 11:26 PM   #4 (permalink)
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Re: Tips for O/A levels Chemistry students

Originally Posted by AlphaEternalα View Post
After looking at all those complex terms, all I can say is... I think I'm going to be in for one hell of a ride for approximately two entire years

On the other hand, I am really enthusiastic to learn more about it at the same time...hopefully the enthusiasm doesn't dissipate.

Is Wikipedia reliable enough for finding out more about these, may I ask?
Would you consider going for tuition (eg. mine or Mr Chong's, for instance)?

No worries, you can always try out your JC life without tuition, and ask your questions here.

But (whether in tuition or in SgClub forum), you have to do put effort in your own self-study (eg. including Wikipedia) and be self-motivated in your learning. For instance, whenever you come across a word or concept (eg. that I mention in my posts, regardless of whether or not it's included in your school notes or even syllabus) eg. "resonance", you have to have the self-discipline and self-responsibility to look up these terms and concepts to educate yourself. We won't spoon-feed you (ie. all students), because this is the Age of the Internet : Google be thy Sword, and Wikipedia be thy Shield.

Wikipedia is the best encyclopedia on Earth for all Science subjects (including Chemistry and Medicine), because it is the most up-to-date reference material that is peer reviewed by millions of people every minute, including millions of doctors, chemists and professional scientists.

Therefore, yes, use Wikipedia for all your Science subjects. But of course, almost all of the Wikipedia entries, eg. on Chemistry, Medicine, etc, are written at University and professional levels, significantly beyond A levels. (for online Chemistry resources targeted at A level, visit my website).

For instance, at O levels, you simply memorize that "transition metals form coloured compounds". Now at A levels, you need to be able to explain why. Compare the A level content versus Wikipedia content for this little subtopic :

A level version, on Jim Clark's A level Chemistry website :
http://www.chemguide.co.uk/inorganic...ns/colour.html

Wikipedia version (just one out of numerous inter-linked pages on this topic) :
http://en.wikipedia.org/wiki/Crystal_field_theory


Last edited by UltimaOnline; 8th January 2014 at 01:16 AM. Reason: BedokFunland JC
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Old 7th January 2014, 11:34 PM   #5 (permalink)
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Re: Tips for O/A levels Chemistry students

Originally Posted by UltimaOnline View Post
Would you consider going for tuition (eg. mine or Mr Chong's, for instance)?

No worries, you can always try out your JC life without tuition, and ask your questions here.

But (whether in tuition or in SgClub forum), you have to do put effort in your own self-study (eg. including Wikipedia) and be self-motivated in your learning. For instance, whenever you come across a word or concept (eg. that I mention in my posts, regardless of whether or not it's included in your school notes or even syllabus) eg. "resonance", you have to have the self-discipline and self-responsibility to look up these terms and concepts to educate yourself. We won't spoon-feed you (ie. all students), because this is the Age of the Internet : Google be thy Sword, and Wikipedia be thy Shield.

Wikipedia is the best encyclopedia on Earth for all Science subjects (including Chemistry and Medicine), because it is the most up-to-date reference material that is peer reviewed by millions of people every minute, including millions of doctors, chemists and professional scientists.

Therefore, yes, use Wikipedia for all your Science subjects. But of course, almost all of the Wikipedia entries, eg. on Chemistry, Medicine, etc, are written at University and professional levels, significantly beyond A levels.

For instance, at O levels, you simply memorize that "transition metals form coloured compounds". Now at A levels, you need to be able to explain why. Compare the A level content versus Wikipedia content for this little subtopic :

A level version, on Jim Clark's A level Chemistry website :
http://www.chemguide.co.uk/inorganic...ns/colour.html

Wikipedia version (just one out of numerous inter-linked pages on this topic) :
http://en.wikipedia.org/wiki/Crystal_field_theory
Thank you for the response

I might consider tuition for H2 Chemistry (I live in the West), but for now, I am rather indecisive about this so I guess it's a wait and see situation.

And thank you again for the advice and stuff, sorry that I can't say much here, I've been busting my brains for the words I wanted to say.

And don't worry, I don't expect to be spoon-fed
Taking the initiative to go the extra mile is an important step that I definitely won't miss

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Old 7th January 2014, 11:41 PM   #6 (permalink)
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Re: Tips for O/A levels Chemistry students

Originally Posted by AlphaEternalα View Post
I might consider tuition for H2 Chemistry (I live in the West)
Aww shucks, way too far for my BedokFunland JC tuition (located in the East between VJC and TJC). Hopefully Mr Chong's location @ Toa Payoh will suit you better (should you wish to go for H2 Chemistry tuition in the future).

Post your H2 Chem questions here in SgClub often! And invite your JC friends to do so too!



Last edited by UltimaOnline; 7th January 2014 at 11:42 PM. Reason: BedokFunland JC
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Old 9th January 2014, 12:09 PM   #7 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi Mr Heng,
Thank you for posting the answers. You are spot-on!
Hi AlphaEternal, pls do not be intimidated by this question. This type of question is only done by students in Apr - Oct (latter part of JC life) in JC2. These are some of the toughest types of questions that can be set by examiners. But this question is considered "easy" already by 2010-2013 standards.

Best regards.

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Old 9th January 2014, 06:50 PM   #8 (permalink)
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Re: Tips for O/A levels Chemistry students

really an interesting question ... though I give up halfway but if I have my A level mentality and all the reactions in my mind ... should be able to do it

Organic Chem really need a complete mastery of all the equations and reactions and able to think out of the box

It looks intimidating at first but trust me, as long as you had those in mind and practice enough , should be okay

That question is more for those students who had completed the entire syllabus to attempt

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Old 14th March 2014, 05:40 AM   #9 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi all, I have made minor updates to my blog. Do look at it. Some of my questions need a more complete overview of organic chemistry in order for students to tackle the questions.

Cheers!! All the best!! Hopefully, this year's papers are almost as "easy" as last year's papers.

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Old 2nd October 2014, 11:44 AM   #10 (permalink)
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Re: Tips for O/A levels Chemistry students

How to do well for o level pure chem?Do TYS and tons of other sch papers?Any tips for o level?

Thanks

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Old 17th October 2014, 03:44 AM   #11 (permalink)
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Re: Tips for O/A levels Chemistry students

Yes, now is the time to do TYS. Let's say you do not know how to do one part of the question. Go back to your textbook or guide book, re-read the section that is relevant to the question, and redo the question.

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Old 19th January 2015, 11:32 AM   #12 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi everyone,

In the new academic year, we need to plan our time wisely. Setting goals for what we want to achieve this year and motivating ourselves to accomplish the tasks ahead despite obstacles, are imperative. The challenge is to better ourselves and specifically, for chemistry, is to be curious about the world of atoms, molecules and ions.

Do keep an open mind and be positive about learning the analytical skills in chemistry that will be for use in applications throughout your adult life.

All the best!!

http://alevelchemistrysg.blogspot.sg
http://olevelpurechem.blogspot.sg

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Old 7th April 2015, 11:26 AM   #13 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi all,

I have created a new post titled "Substances that teachers may like". These molecules have appeared in Cambridge papers in recent years and your teachers may re-use some of these molecules in test papers. So have a look at this post.

http://alevelchemistrysg.blogspot.sg...ke%20in%202015

Thanks and all the best!!

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Old 14th July 2015, 03:10 PM   #14 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi all,
With your promos and prelim exams coming, I have posted a Practice Paper for JC2 Prelim exams. The standard is lower than your prelim papers and it may serve as a consolidation exercise for you.

http://alevelchemistrysg.blogspot.sg...actice%20Paper

All the best to you!!


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Old 9th April 2016, 09:41 AM   #15 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi all,
My A level chemistry blog has changed its domain name.

Thank you for your support over the years.

http://olevelpurechem.blogspot.sg

http://www.alevelchemistrysg.com

Cheers!



Mr Chong

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Old 20th July 2016, 10:35 AM   #16 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi all,
I have given a new look to my A level Chemistry blogs. Do take a look!

http://www.alevelchemistrysg.com

Mr Chong

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Old 2nd January 2018, 05:32 PM   #17 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi all,
Have a happy New Year 2018!!

I have added some materials to my 2 chemistry blogs:

http://alevelchemistrysg.com

http://olevelpurechem.blogspot.sg

Do take a look!!

All the best for your study life in 2018. I wish you success.

Mr Chong
ex-JC tutor


Last edited by simple_minded; 2nd January 2018 at 05:33 PM.
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Old 8th July 2018, 04:42 PM   #18 (permalink)
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Re: Tips for O/A levels Chemistry students

Hi,
I have made slight updates in my blogs. Do take a look!!

Cheers!

Mr Chong

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