"Up Your Chemistry Grades Now!" Free Intro Section!

One word to sum it up : madness!

Here’s What I Got:

I’m excited to annouce the launch of “Up Your Chemistry Grades Now!” - Score The As You Deserve By Knowing What Examiners Are Looking Out For!

Here’s What “Up Your Chemistry Grades Now!” Will Do For You:

• Shows and teaches you the difference in answering similar questions like “What do you understand by the term alkanes …” verse ” Define alkanes” - Glossary of Terms - Comprehensive and commonly misused terms
• Examination tips that you overlook (or perhaps not even aware of!). By knowing them, they save you the time to crack your already stressful mind during the papers and of course score more marks by giving what examiners are looking for!
• Reveals the common mistakes students made! (which you do not want to be part of it!) 10 years of coaching and you can imagine the load of mistakes I have witnessed … All these valuable secrets do 1 thing for you : ensure you do not repeat them!
• Highlight THE ANSWERS which will get you the As you truly deserve.
• How to present the concepts you already have in the way the examiners love to read!
  

Here’s What I Want You To Do Next: (Do this quickly)
Download your FREE copy of Introductory Section to “Up Your Chemistry Grades Now!” HERE

(I am limiting the number of copies, once reached. It will not be available anymore!)

PS: “Up Your Chemistry Grades Now!” is not like any other revision books out there. It is written by ME! (Read more about me here), someone who has breathed Chemistry all his life, coached tens and hundreds of students to achieve what they truly deserve! This book is basically written by all my students for all students who have yet to unlock the SECRETS of Scoring in Chemistry!

Mole Calculation Mastery Workskop

Hi Students,

2 months to GCE O Level, Have you scored the marks you truly deserved?

Is Mole Calculations your #1 Killer Topic?

Click here to find out more



Over the years, this topic is often voted the “Hot Favorite” on students’ challenging topics. Some have

- problems understanding what the question is asking for,
- do not know where to start,
- totally blank when they read the question,
- too confused with the formulaes to use…WHY?

Click here to find out more

Let’s check out a typical exam question on Mole Calculations:

Question:

The following equation represents the precipitation reaction between lead (II) nitrate solution and potassium iodide solution.

aPb(NO3)2(aq) + bKI(aq) –> cPbI2(s) + dKNO3(aq)

In an experiment, 20.0g of lead(II) nitrate and 20.0g of potassium iodide were dissolved separately to form 250cm3 of lead (II) nitrate solution and 250cm3 of potassium iodide solution.

(a) Determine a, b, c and d. (2 marks)

(b) Using suitable calculation, identify the limiting reactant. (2 marks)

(c) What is the maximum mass of lead (II) iodide (PbI2) that can be obtained from the experiment? (2 marks)

(d) What is the concentration of potassium nitrate in the reaction mixture when the reaction is completed? Give your answers in mol/dm3. (2 marks)

(e) Write an Ionic Equation for the above reaction and identify the spectator ion. (2 marks)

Here is the answers:

a) a = 1 , b = 2, c = 1 and d = 2

b) KI is the Limiting Reactant.

c) Maximum mass of PbI2 that can be obtained = 27.8g (to 3 sf)

d) Concentration of KNO3 = 0.241 mol/dm3

e) Ionic Equation: Pb2+(aq) + 2I-(aq) à PbI2(s). Spectator Ions: NO3-(aq) and K+(aq)

PS: If you cant solve those questions comfortably, i strongly encourage to join us at the Mole Calculations Mastery WOrkshop on 16th Aug, where you know everything that you need for Mole Concepts, before your nearing Exams.

Click here to find out more

GCE O Level Chemistry Intensive Topical Revision Bootcamps (in June 08)

We will be conducting GCE O Level Chemistry Intensive Topical Revision Bootcamps to prepare students for Sec 3 Final Year Examinations and GCE O Level/Preliminary Examinations respectively.

Chemistry Intensive Topical Revision Bootcamp 1:
--> Extensive Coverage of Sec 3 Fundamental Topics
* Kinetic Particle Theory
* Purification & Separation
* Elements, Compounds & Mixtures
* Atomic Structure
* Covalent, Ionic & Metallic Bonding
* Balancing Chemical Equations, Mole Concepts & Chemical Calculations
* Acids, Bases & Salts

Chemistry Intensive Topical Revision Bootcamp 2:
--> Extensive Coverage of Sec 4 Application Topics
* Oxidation & Reduction (Redox)
* Electrolysis
* The Periodic Table
* Metals & The Reactivity Series
* Energy Changes
* Speed of Reaction
* Ammonia

Please check out our Chemistry Blogsite to find out more details at http://www.simplechemconcepts.com/

PS: For students & parents interested in Combine Science (Chemistry) Intensive Revision Programs, please do not hesitate to contact us. We will look into setting up a revision program once we have the minimum number.

"Determination: Determine that the thing can and shall be done, and then we shall find the way"
- Abraham Lincoln

Freebie Download - Balance Chemical Equations Tips Video

Dearest all,

Merry Xmas! & Have a blessed year ahead!

As promised, Sean has completed this X'mas present for everyone. This present will allow anyone to be a master in BALANCING. Yes! I mean Chemical Equations :)

You can download this video for f*ree!
Go to http://www.simplechemconcepts.com
It's on the right hand side for the download of this freebie!

Cheers,
alwaysLovely
on behalf of Sean

Chemistry Question - Practical Qns

Hey can you pleaseeeeeeeeeeeeeeee help me with a qn.

This is for the chemistry spa I would be sitting tmr (SEC 3)



During an acid base titration, what are the possible sources of experimental error?



It would be great If I could get a reply today bcos as I have mentioned earlier I am sitting for the science practical O LEVELS tmr!!

THANKS.


Three most common ones are:

1) Parallax Error - Wrong placing of the eye while taking readings
2) Meniscus reading - Should be done at the bottom of the meniscus curve, not above or within the curve
3) Washing of the conical flask with analyte before titration. This causes additional amount of analyte to be included into the flask (in addition to the actual amount that you intended to pipette in)

Sean
SimpleChemConcepts

O Level Chemistry Tip By Sean Out in 2007 Chemistry Paper 2

1 comments: illuminate-x said...
THANK YOU SO MUCH for the tip for the weak/strong acid question! It came out for Chem Paper 2 today and I was so relieved I saw the post just yesterday. :)

October 24, 2007 3:37 AM

WOW!

Final Preparation - Stay Focused!

One more day and your O Level examinations will be kicked-start formally..

Understand that some are feeling tired and some bored after preparing for the Prelims, taken it and now another period of preparing for your O levels.

Come on! Cheer up! We have been through all this before..You are not walking alone..

Stay Focused and Determined..Just 1-2 more weeks...

If you happen to be still able to see this blog, check out the short video clip:
http://successessentials.blogspot.com/2007/07/inspiring-movies-most-influential.html

Last but not least,i would like to wish you:

ALL THE BEST TO YOUR COMING EXAMS!!!!

=)

Sean
SimpleChemConcepts
"Learning Experience with A Difference"

A qn from June 2007 Qn Coordinate Geometry

Point B is intersection of Line AE & BE
1.find eqn of these 2 lines
2.Solve simultaneously
B= (5,8)


Area of EBC is given
Never use distance to solve this part!

1/2 xBxH = 24
What's the base? What's the height?
Base = EC = (x-3)
Height = Vertical Distance from B to line EC = 4

By simply using the CORRECT base & height strategy allows me more time for the rest of the questions!

C=(15,4)

To find D,
Use Eqn of AD

D=(15,-2)

;)

More elaborate step by step solutions & power tips are
available here.
Click here
We have parents
already purchased a copy for their children. Even students buying for themselves
through Bank Transfer.
I was "scolded" by one of the students who bought the
papers "Why didn't you let me know earlier?"
Well, late better than never,
isn't it? ;)

Well, there's only 1 O level and it's really starting. You
decide how you want to spend your time.
For those who are serious in doing
your best and getting the marks you deserve for your Monday paper, you
should get the step by step solutions today cos price is going up tm(Fri)

What another student did for this qn:
(Click on the image to see clearly)

A-Math Integration of tan^2 x

lijun(: said...
i came across this qu that day, and i really want to clarify if the method i used is correct or not.

int(tan^2x - x^3)

i changed it to int(sec^2x - 1 - x^3) instead, cos i don't think we can integrate tan.

is that feasible?

Absolutely. Since tan^2 x can't be integrated, you must think of alternative by making use of the relationship of tan^2 x + 1 = sec^2 x

A-Math P & C Clarification

lijun(: said...
hey. i just want to clarify something that i'm not very sure of.

is nCr x r! = nPr ??


By definition,

nCr = nPr/r!

Well, I never remember this 'rule'
For example, find the number of ways to form a 3 letter word from a,b,c,d,e

Student #1:
5C1*4C1*3C1

Student #2:
5P3

Both answers are correct though different approaches are taken, so no need to remember the 'rule'

:)

Excellent Positive Attitude

Think i came in bit late, but better than never i suppose..Happy Childrens Day!

You have been working very hard (i suppose) for the past few months. Regardless of the results that you achieved in your Prelims Exams, Give Yourself some "Claps"..You deserve it more than anyone, for working so hard.

Been too stressup to even give yourself a SMILE =)??
Check this Thai Ad out...You do need to take some time off to chill and refresh your mind..while studying for the finale.


Nice rite?? Hope i can see you smiling.

There are some who told me that they have problem to keep focus and prepare for their upcoming O levels. I would just like to urge you to stay positive during this period. Think of the dream college/Poly Course that you would like to go..Think of the fun and the amount of things that you are going to do when you finish of your last paper..and you could simply put down that rock on your chest, by simple saying: "Yes. I have finally done my part for the O levels. Nothing to regret at all. Time to enjoy!"

Here is one of those movies that i watched regularly to stay motivated and positive.
Hope you will find it equally Inspiring.


Rgds,
Sean
SimpleChemConcepts

Great Partcipation Going On!

hello Big Children!
Happy Children Day! ( I almost type Happy Chinese New Year!) tsktsk
I believe all of you have received your prelim results by now.

Those who have done well, continue with the good progress. Remember, you have completed the entire race only when you touch the finishing line ( Recall: the hare and tortoise story) Lend a hand to friends who need a little support and a little encouragement :)

For those who didn't do as well, now is the final chance, you are given 1 last chance, you either make the best out of it or ....... well, there's NO or!
You only have 1 option : Run this race as hard as you can to finish this race! Even with panting breath, tired legs, sore feet...... You must do it!

Me and Sean will be here to lend you all the support you need for the next 30days or so!

All the way!

“When things go wrong, as they sometimes will,
When the road you are trudging seems all uphill,
When the funds are low and the debts are high,
When you want to smile but you have to sigh,
When care is pressing you down a little bit,
Rest, if you must - but don’t you quit!

Life is queer with its twists and turns,
As everyone of us sometimes learns,
And many a failure turns about
When he might have won had he stuck it out;
Don’t give up, though the pace seems slow
You must succeed with another blow.

Success is a failure turned inside out
The silver tint of the clouds of doubt
And you can never tell how close you are,
It may be near when it seems afar;
So stick to the fight when you are hardest hit
It’s when things get worse you mustn’t quit.” Edgar Guest

I listen to this when I need to run my own races :)

A-Math More Trigo Graphs

On the same diagram, sketch the graphs of

y=sin 3x & y=cos2x,
for x between 0 degree and 180 degree
Hence state the number of soutions to the equation
sin 3x=cos 2x
in the interval 0 degree less than or equals to x which is less then or equals to 180 degree


Click on image to have a larger view

A-Math More P & C Qn! On forming numbers

How many even 5-digit numbers more than 50000 can be formed using the digits, 1,2,3,4,5,6,7 if no digit is to be repeated?

Conditions
#1: Even
#2: 5-digit number
#3: no digit is to be repeated

Case 1:When the first digit is odd (must be more than or equal to 5)

2C1 * 5P3 * 3C1

Logic & Reasoning:

first digit: either 5 or 7 so 2C1
last digit: either 2,4 or 6 so 3C1
the remaining 3 digits can be choosen from the leftover 5 numbers so 5C1*4C1*3C1 also = 5P3

Case 2:When the first digit is even

5P3 * 2C1

Logic & Reasoning:

first digit: 6 so no need to choose just put!
last digit: either 2 or 4 so 2C1
the remaining 3 digits can be choosen from the leftover 5 numbers so 5C1*4C1*3C1 also = 5P3

Total even 5-digit numbers more than 50000 can be formed using the digits, 1,2,3,4,5,6,7 if no digit is to be repeated = Case 1 + Case 2 = 480

:)

Application of Differentiation - Maximum/Minimum & Rate of Change

Qn2
A closed box with a square base of length x and height h, is to have a volume, F, of 150m^3. The material for the top and bottom of the box costs $2 per square metre, and the material for the sides of the box costs $1.50 per square metre. Fnd the value of x and h, correct to 3 decimal places, if the total cost of the materials, C is to be a minimum.
Qn3
A viscous liquid is poured onto a flat surface. It forms a circular patch which grows at a steady rate of 6cm^2/s. Find,
a) the radius r, in pie, of the patch 24 seconds after pouring has commenced.
b) the rate of increase of the radius at this instant, correct to 2 decimal places.

Done reading the qns? Do and see if your answers are correct!

:)


Click on image for enlarged view.

Trouble with Integration of Ln & Expo

I seem to have trouble now with integrating ln and e.

Haha, you are having trouble because you are learning sth you don't have to know at O'Level. You don't have to know how to Integrate Ln directly.

Having said this, you note that you must know how to Differentiate Ln, e and Integrate e

For more info on how to differentiate Ln and e, refer to this post >>
http://askalwayslovely.blogspot.com/2007/09/math-differentiation-with-ln.html



Okie how to Int e
Example
Int e^(2x+3) = e^(2x+3)/2 + c (since there are no limits given)

In short to Int e^(wadever) = e^(wadever) OVER (Differentiate wadever)

A-Math P & C Qn!

The no. of applicants for a job is 15. (i)Calculate the no. of ways in which 6 applicants can be selceted for the interview.

The six selected applicants on a particular day. (ii)Caluculate the no. of ways in which the order of the six interviews can be arranged.

Of the 6 applicants, 3 have backgrounds in business, 2 have backgrounds in education and 1 has a background in recreation. Calculate the number of ways in which the order of the 6 interviews can be arranged, when applicants having the same background are interviewed in succesion.


Who's up for this challenge?



******************************

Of the 6 applicants, 3 have backgrounds in business, 2 have backgrounds in education and 1 has a background in recreation. Calculate the number of ways in which the order of the 6 interviews can be arranged, when applicants having the same background are interviewed in succesion.

BBB EE R

So there are 3 groups of people and there are 3! ways of arranging these 3 groups
Within BBB group, there are 3! ways of arrange these 3 B people, similar within EE group, there are 2! ways of arrange these 2E people
so Total = Arrange Big Groups * Arrange within each group = 3! * 3! * 2!

A-Math Qn Involving Ln / Log

Hi, i have a question which i can't solve it.
Qn: Peter deposited $540000 in a bank at the beginning of 1980, which gave a compound interest of 1.8% per annum, which pays directly into his bank account. After a period of t years, the amount of money that peter has in the bank was given by 540000( 1.018)^t. Find
a) the amount of money peter has at the beginning of 1993.
b) the year, in which he would have one million dollars.
If peter wants to have one million dollars in 20 years, he needs to find a bank that gives a compound interest of r% per annum. Find the value of r.


a) 1993-->1980 = 13
when t = 13, amount of $ he has = 540000( 1.018)^(13)

b)1,000 000 = 540000( 1.018)^t
1.85 = ( 1.018)^t
Either take Ln or Log on both sides of the equation ,

Ln1.85 = t Ln1.018
t=34.5 years = 35 years to have the 1 million dollars
1980 + 35 = 2015

***************************************
let r be the compound interest rate
1,000 000=540000(1+(r/100))^20
1.85= (1+(r/100))^20

Taking Ln on both sides,
Ln1.85= 20 Ln(1+(r/100))
Ln(1+(r/100))=0.0308
1+(r/100)=1.0313
r/100=0.0313
r=3.13%

When your unknown is located in the POWER, in order to bring it down, you can either Log or Ln both sides of the equations.

Drawing of Trigo Graphs

Can you give an example of a drawing of tangent graphs? For eg, 3tan2x + 1, what does each stand for and how do i go about drawing?

From the drawing, you see only 1 diagram instead of a few diagrams as what most people will have.

The secret is............ I drew my x and y axis LAST which is the reason why my diagram is so neat and it takes me less than 2 min to complete : )

Click on diagram to have an larger view

Differentiation of e

How to differentiate e^tanx?

first of all to differentiate e^anything = (Diff anything)*e^anything

so to differentiate e^tanx = (Diff tanx)*e^tanx = sec^2x*e^tanx

:)

btw, i couldn't remember what is Diff tanx = to, but i know how to sinx & cosx
so tanx=sinx/cosx Diff using quotient rule, get the ans within 30s :)