General tips to takin ur exam

1. Dun take too much time on 1 question, if u duno, leave it. If u noe, but take long time, leave it. If u noe do, but working long, marks little, leave it. If u noe do, working long, marks lot, love it.

2. PLan the time properly.

3. Priority is given to the easy questions tat u can get marks, not the Hard n long questions which carry lots of marks. Get wat u can first, then onli shoot for the big one.

4. If u dunno, see bside, in front. Mayb ppl will be doing some gestures or talking softly, can get some idea. (ITS NT CHEATING).

5. Dun panic, if u duno, means its hard, GO do others first. Dun hang n think. Even if u jz have to tink a little bit, leave it first, unless ur scared tat u will forget how to do it.

6. Alwayz check, if u have time. ><

7. If u canot do 1 question, meaning duno do, and u have 5 minutes left, CHECK ur work, dun bother to tink hw to do tat question d. Odds are tat 5 minutes wont be enuff to complete it.

8. If u are going to memorize things, at the start of the exam , see thru the questions and write out the ones tat u need to use. Then dun bother about the memorizing d, Gives u more space to tink.

9. Pray hard, eat rite, sleep rite, and answer in pen =P

10. good luck =)

Guide to Crapping in Your Chemistry Test

=================================================
==========Guide to Crapping in Your Chemistry Test=========
========================Part 1=====================
=================================================

Version 1.0
Last updated 30/1/09
Author: Sunny Ooi Jian Zhen


Intro:
This guide is made in the hopes of helping those hu cant pass their chem, or lack confidence.

This guide SHOULD not be made your primary hope in the exam, coz. as the name suggest, its crap.

This guide should only prove useful when one does not know how to answer the question and has to crap, so the methods here may sound like crap to those who are able to answer the question.

Please dun flame. T_T

============================================================

1. Inorganic Chemistry

Important things to note here is the electron configuration, equations n explaining stuff.

I advice to reali noe the configuration stuff, coz tat can probali help u to do all the explaining.


So first part of my guide is how to crap for the explaining part.





=======================================================
================Explaining Stuff===========
=======================================================



There can be 3 cases when facing a problem that requires u to explain why;
i) Noe.
ii) Dunoe.
iii) Never see b4.

First case, sure pass.
2nd case, got hope.
3rd case, pray hard.

BUT have no fear, hopefully after tis can pass la. =P

** FOr explainling type questions, ALWAYS, ALWAYS Write a summary or conclusion at the end



Sample question.

"The first ionizing energy of phosphorus is higher than sulphur. Explain why."
question from chem january 08 UTAR paper. lazy type out all so it may seem a little different.

For this question, i like to call it a "Exception Type" question. This is because it ask u why an exception is present.

So for those hu are grouped in the "Never See Before" group, u gotta learn how to see wat type of question it is.

Chances tat questions tat have the explain why, why, reason etc etc in the question is the exception type questions.

So how do you answer an "Exception Type" question?

Step 1

You have at least noe how to do electron configurations.

"Exception Type" questions for UTAR syllabus only have 2 major exceptions.

i) Stability of the Electron Shells
ii) Fluoride atom


============================
Stability of the Electron Shells
============================


Again, u have to at least noe hund's rule tat says tat electrons filled up half filled is more stable. (at least i tink its hund's rule). but nwayz try writing out the electron configuration of the atoms. You should see some Special stuf about them




As u can see, the 3p shell of phosphorus is half filled which means it more stable than sulphur.

Tadah. Try tis technique when u come across this type of questions. Draw out the electron configuration.





Another thing u have to noe is the 4s n 3d orbitals , the energy level between them is low.

In simple terms, means the electron can jump jump from 4s to 3d, see they syok which wan.

The electron will jump to make the atom more stable. This is mostly related to Transition elements.

Sample question.

"Write the electron configuration for Chromium (Cr) and Copper (Cu)"

Copper:

As u can see, the lower wan has half filled electrons in its 3d orbital, which is more stabil, so the 2nd configuration is taken, not the first.





Chromium:


The second arrangement has the 3d orbital fully filled, means its more stable.








====================================================================

Florine atom

=====================================================================

Florine actuali very simple.. florine very SMALL. so usuali the bond length between it and another atom very short. So it very hard react. End of story. =P


(31/01/09)

**bond length is from the middle to middle.



But thats not all for the special fluorine. Fluorine is a very very very VERY VERY electronegative atom, means it has a very high tendency to attract electrons. Mostly the question has a relation to its electronegativity.

So what if its very electronegative, big deal.

Wrong, its a big deal. Bcoz its so electronegative, it can form hydrogen bonds.

Hydrogen bonds is bonds formed between [H]ydrogen and a very electronegative atom, such as F,O and N.

You have to remember tat hydrogen bonds can be formed by [F]luorine, [O]xygen and [N]itrogen, Very important in the organic chem.



Sample question.

"Explain why the boiling point of hydrogen fluoride is the higher than the boiling point of hydrogen chloride."

-question from UTAR april 2008-

So u should be able to explain it alreadi rite? but jz in case, heres wat i would write.

-fluorine is a very electronegative atom
-can form hydrogen bond between H and F
-need more energy to break the bonds. (Van Der Waals and hydrogen bond)
(summary!)
-hence, HF has a higher boiling point than HCl

=====================================================================

Ok, so we r done wif electron arrangement, so lets go to other stuff they may ask. Boiling point, acidity, etc etc.

Here's a summary.

Boiling point	Van der Waals forces, Hydrogen bonds
Acidity	Ability to dissociate H
Basicity	Ability to accept H

So if it comes out in test, n u have no idea y, jz crap some stuff using those words. =D

Should be can get a few marks la. hehe.



===================================================================
Organic Chem
===================================================================

This wan go many, n if i write them out, it wont be a guide to crap ledi. (n im lazy =P)

So i jz gonna tell the basics, after tat u gotta crap on ur own. =P



Boiling point

i) ALWAYZ FIND THE HYDROGEN BOND. Mostly questions will ask about it.


Sample question.

"Why does carboxylic acid have a higher boiling point than amines and alkenes?"

So, basics u gotta noe is wat are those stuff.

Carboxylic acid got -COOH
Amine got -NH2
Alkene got - Double bond.


So, if u have been paying attention, u would have realised smt.

Boiling point question. Wat should u do first?

Find the hydrogen bond if any.






Carboxylic acid- hydrogen bond formed wif O and H

Amine- hydrogen bond formed wif N and H

Alkene- none.



So, now u should be able to explain why caboxylic acids and amines have a higher boiling point.

BUT!
Why carboxylic acid higher? ><"

If u tink about it, wat makes a hydrogen bond stronger?

Imagine 2 magnet, with a positive and negative pole each being brought near each other. I

f the magnet has a stronger negative pole, the attraction stronger rite?

So in hydrogen bond cases, its similar.

If the electronegative atom is more electronegative, (meaning its very easy to attract electrons) the stronger the hydrogen bond.

=) Get it?

So sample answer mayb smt liddat.

-carboxylic acid and amine has hydrogen bonds while alkenes onli have weak van der waals forces.

-more energy needed to break the hydrogen bonds
-higher boiling point.

-the hydrogen bonds of carboxylic acid is stronger than amine.
-tis is because the hydrogen bonds formed between H and O is stronger than H and N
-tis is because O is more electronegative than N

-hence, more energy is needed to break the hydrogen bonds of carboxylic acid
-which makes it have the highest boiling point.

(summary)
- Carboxylic acid has the highest boiling point, followed by amine and lastly alkenes. ============================
Electron donating/withdrawing Groups
============================

Tis is a quite popular question.


Electron donating groups are groups tat PUSH their electron while
electron withdrawing group PULL electrons.

Electron donating group

1. R(alkyl groups)

For tis case rite, the C will have a higher negative charge, cause the R all push towards C.

So the C will have a partial negative n H will have a partial positive

The force between them bcome stronger, coz C bcome more negative.

Remember the magnet. =D

Electron withdrawing group

1. Benzene ring
2. Halogen

Tis case on the other hand, the H easy to release.

As the electrons are being pulled away from the C, the Partial negative of the C bcom less,

So strength between H and C bcome weaker

H easier to go out/dissociate.







U can use tis basics to answer most questions. Like acidity and basicity. =)

Good luck ya.


==========
End of part 1.
==========

April 08 CHemistry

April 08 CHemistry


Please see corrections for CHEMISTRY JANUARY 08 .(look at previous post)


Last update

22/1/09

*New page*

Heart attack

Got tis email from a frend. pretty useful. ABout heart atttacks, Wat to do if ur alone. check it out, it takes onli 45 seconds of ur life.

Guide to save urself from heart attack

Chemistry January 2008

This are my answers for Chemistry January 2008 past year paper for UTAR.

(last update 21/1/09)
** PLEASE GET THE CORRECTIONS**
*found errors* (21/01/09)
*fixed errors*(21/01/09)










I canot gurantee the correctness of my answers, but roughly i tink should be correct la.


PLease let me noe if u see any errors. =D


PLease dun not depend on tis if possible, because again, i canot gurantee the corectness.


I do not know how the marks are allocated, so i wrote pretty much everything i could think of.





PS

1.
I took a long time(approximately 2 hours) to do tis, so please dun go sending it to people hu dun

noe me (or hu do noe me) saying tat u did it. I hate those type of ppl, ( n i so happen to noe

a few).

If u wan face tat much, say u got it from some unknown fella, dun say u did it urself. i curse u to

die under god's wrath n fail tat exam if u do. XD




2.
I did tis to help some of my frends, because i cant study group wif them these sem as i hav to go

back penang for cny. ~~ SO! please dun go around telling ppl, "oh tat paper ar? actuali i teach

him how to do wan. He didnt noe how to do tis question tat question, I had to explain it to him. I

also corrected some of his errors, like tis part. He actuali didnt explain to the question.... etc etc

etc"

(unless ur my lecturer, then tats different. =D, or ur a god like jian fung, hock heng, etc )

Im nt arrogant or anything, but seriously, i dun like tis kind of ppl. i dun mind if u dun wanna say

i did it, jz dun say U did it.



Finally

I hope tis helps. (^> =D XD =) <^)

oh, n the paper arranged not in order, follow the numbers ya ^^

(*update* pages nw in order*)









CORRECTIONS

Page 4

Page 8




Page 9























PAPER

Page 1

Page 2

Get corrected copy

Page 3

Page 4

Get corrected copy

Page 5

Page 6

Page 7

Page 8

Get corrected copy

Page 9
Front part is wrong. Please refer corrections.

Page 10

Feel free to spread around to those hu need it. =D

Btw , its organic chem. similar to stpm sylabus. if ur nt from utar n want the paper.

Get it here below

>< >< >< Utar Past Year Chemistry January 2008
>< >< ><

Random, but quite true,cept some parts.

Your view on yourself:

You are down-to-earth and people like you because you are so straightforward. You are an efficient problem solver because you will listen to both sides of an argument before making a decision that usually appeals to both parties.

The type of girlfriend/boyfriend you are looking for:

You like serious, smart and determined people. You don't judge a book by its cover, so good-looking people aren't necessarily your style. This makes you an attractive person in many people's eyes.

Your readiness to commit to a relationship:

You are ready to commit as soon as you meet the right person. And you believe you will pretty much know as soon as you might that person.

The seriousness of your love:

You like to flirt and behave seductively. The opposite sex finds this very attractive(yea rite), and that's why you'll always have admirers hanging off your arms (how come im nt informed of tis? =P ). But how serious are you about choosing someone to be in a relationship with?

Your views on education

You may not like to study but you have many practical ideas. You listen to your own instincts and tend to follow your heart, so you will probably end up with an unusual job.

The right job for you:

You have many goals and want to achieve as much as you can. The jobs you enjoy are those that let you burn off your considerable excess energy.

How do you view success:

You are afraid of failure and scared to have a go at the career you would like to have in case you don't succeed. Don't give up when you haven't yet even started! Be courageous.

What are you most afraid of:

You are afraid of having no one to rely on in times of trouble. You don't ever want to be unable to take care of yourself. Independence is important to you.

Who is your true self:

You are full of energy and confidence. You are unpredictable, with moods changing as quickly as an ocean. You might occasionally be calm and still, but never for long.

Untitled

Its been some time since i last updated, partly becoz i dun have any pics to post 2gether wif my post, which makes the post look a bit dull ( tis is due to the fact that tis sem is pretty busy so none of us have been taking pics ).

so im gonna update a lot of words wan post lor. boring as it may be. hehe.

nwayz, my finals are coming, n im chasing one piece(an anime).
duno y la, tis sem im reali lazy. nvr study also.. haiz.

failed my physics test 2. == i put some of the blame of the fact tat i had to go out on the day b4 the test due to some issues. i planned to do last minute studying for physics wan, coz we were like having 4 test n 1 assignment in the duration of 2 and a half weeks.

i should have paid better attention in class, then tis may not have happened, although i tink the main prob is my time management, i tink i put too much attention onto the assignment. Programming is so much more interesting than physics.(at least sem 2 phyics la)



oh yea, although its 1 day late. i jz wanted to wish

HAPPY BURTHDAY

to

CHAN JOO LING
(sorry i cant celebrate wif u tis time. hehe)

n
EVELYN WAN
( i got the spelling right tis time rite? hehe)

ok la, nth much d. hehe. ltrz