"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

Organic Chemistry Mastery Workshop - Final Revision for Chemistry Prelims & Exams

For more information, click here >> http://www.SimpleChemConcepts.com/workshop

O Level Chemistry Intensive BootCamp 2008

For all readers in Singapore :-)

*Overseas readers are welcomed if you are flying in

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

Exothermic and Endothermic Reactions

hi there i would like to ask a qn regarding the chapter on energy changes
and hope you will reply. (:

When steam is passed through white-hot coke, a reaction occurs and the
temperature of the coke falls.What does this indicate? Answer: The reaction
is endothermic(this is a mcq qn) Why is the answer endothermic?Since the
temperature of the coke falls, isnt it giving out energy?

By giving out energy, thus the temperature falls.And the definition of
exothermic is heat exitswhile for endothermic it is heat taken in.So, why isnt
the answer exothermic then?

P.S i find this chapter the terms exothermic and endothermic quickly
deceiving and confusing.

That Strange Leaf Movement!

You must check out the recent video taken by Sean, The Chemistry Coach on his recent trip to Bukit Timah Hill Singapore!

Can anyone make guesses why is that happening?!

Strange Strange, movement in total stillness...

http://simplechemconcepts.com/the-strange-leaf-movement/

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

X'mas Presents?

Hello everyone,

for those who partcipated in the voting of the template of the site.Tks for your response.
for those who didn't vote yet, you still have a few more days to vote.

X'mas coming so I guess most of you are busy preparing x'mas presents or are you busy with clearing up more space to receive more gifts?

Whatever the case, Sean, the co-author of askalwayslovely & the SimpleChemConcepts guru seems to be busy preparing something free for everyone to start the new academic year on the right year.

I will push him to release the gift he's preparing soon okie!

Meanwhile, you may want to check out this site on THE SONG!
http://www.simplechemconcepts.com

btw, have you downloaded your copy of "Be a Squaring Expert within 30 seconds"?
Click here to gain instant access http://www.singaporeolevelmaths.com

Less than 15 days to the start of the new school term!

Yeah!

O Level Essential Chemistry Concepts Coaching Programme | Tuition@Woodlands Lib

Dear students,

Sean, the O Level Chemistry Guru is holding his Essential Chemistry Concepts Coaching Programme at Woodlands Regional Library starting on 5th Jan 2008, every Sat at 1pm. It's a 2 hours sessions each Saturday.

He's currently taking in students who DID not pass their Chemistry or obtain just Borderline Pass in the subject.

Class size is kept at a maximum of 8 students to ensure maximum attention is given to every single student.

Register by calling Sean at 9 828 7357. You may contact him for any other coaching matters.

If you think you deserve more than what you are getting currently, learn from him on the simple ways of understanding chem concepts. Afterall, he has helped many students to achieve leaps in their results!

For more info, visit http://www.simplechemconcepts.com

** This is not the usual Chemistry Tuition for O Level students. You will not be left alone just to do papers and papers. You will be taught the essential concepts that will make big difference in your results and yet at the same time enjoy learning Chemistry with a Difference.
You got to be there to experience it!

alwaysLovely on behalf on Sean, co-founder of askalwayslovely.blogspot.com

P.S there is less than 5 months to mid years, less than 9 months to prelims, less than 10 months to GCE O Level!

Be Ready!

Simple Chem Concepts - Experience Learning with a Difference

Dear readers,

Sean, the co-author for helping O Level students with Chemistry Concepts has decided to host all discussion on Chemistry Concepts on his new site
SimpleChemConcepts.com

You may continue to bombard all the Chemistry Qns to him. tsktsk.... and he will continue to provide power tips which will ease your understanding in acids-bases-salts, mole concept, bonding etc....

We look forward in your continued support !

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!

Chemistry Question - Metals & Gases

Hi, I have a Chemistry question..

A metallic element, M, has the following properties:
less dense than water
soft
melts below 100C
occurs naturally as its chloride, formula MCl
the oxide of M reacts with water to form a solube hydroxide

Suggest how metal M can be extracted from its compounds. Explain your reasoning.

Also, how do I distinguish between hydrogen gas and nitrogen gas?

1st step is to identify the reactivity of this metal in order to check out the extraction method of these metals from its compounds (etc, their ores or chlorides)
The properties given suggest clearly that it belongs to Group 1 of the periodic table.

For Group 1 Alkali Metals, they are classified as the most reactive metals/elements.
You should already know about the metal reactivity series by now.

For these reactive metals, the compounds they formed are known to be unreactive (or stable).
Yes. Reactive Metals will formed Stable Compounds!

As such, for these Unreactive Compounds, the only way to extract the pure Metals is by electrolysis of their salts/compounds in aqueous (water) or in molten state.

Hope this information helps.

PS: For the N2 and H2 gases, i am not sure what you mean. But it you really want to differentiate N2 and H2 in the lab, you canm just test for the POP sound with a lighted splint.

Sean
SimpleChemConcepts
Learning Experience With A Difference

Chemistry Question - Acids,Bases & Salts, Organic Chem

Question:

Q1) desribe an expt that you wld caryy out t show that sulphuric acid is a strong acid but ethanoic acid is a weak acid

Ans: This is testing you on the properties of acid. There are 4 ways for you to differentiate acid - pH paper test, Reaction w Metal, Reaction with Carbonate or Reaction with an Alkali. To differentiate the acidity of Sulphuric Acid and Ethanoic Acid, i would suggest to test the amount of CO2 Gas produced when certain amount of the acid are reacted with a certain mass of say calcium carbonate. Suphuric Acid, being stronger acid will tends to give off CO2 gas more and at a faster rate.

Q2)2 salts formed frm sodium hydroxide and phosphoric acid other than NaH(2)PO(4.

Ans: Phosphoric Acid is TRIBASIC, meaning it has 3 Hydrogen atoms to dissociate. It will form 3 salts when reacted with NaOH.

H3PO4 -> 3H+ + PO4^3-
H3PO4 -> 2H+ + HPO4^2-
H3PO4 -> 1H+ + H2PO4-

NaOH + H3PO4 -> Na3PO4 (Ans) + H20
NaOH + H3PO4 -> Na2HPO4 (Ans) + H20
NaOH + H3PO4 -> NaH2PO4 + H20

PS: Pls not equestion is not balanced yet.

Q3) explain why NaH(2)PO(4) is both an acid and a salt.
Ans: It is an acid bcos it can dissociates H+ in water making the solution acidic.
It is a salt bcos it is made by the neutralization process of NaOH and H3PO4. Anyhow, it can also be made by the reaction of H3PO4 with Na metal or NaCO3.

Q4) structural formula f repeat unit of styrene-butadiene
Ans: This should not be covered in GCE O level syllabus. Learnt this poly/uni.
You should know the structural formulae of Styrene monomer, but the question should give you the structural formulae of butadiene. With those structures, use the theory of Addition Polymerization.

All The Best!
Sean
SimpleChemConcepts
Learning Experience with A Difference

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"

Chemistry Questions - Separation / Gases

Q)Which gas is produced in large quantities by fractional distillation?
A. chlorine
B. ammonia
C. nitrogen
D. methane

Last question for the night. Come on..Students taking your Chemistry Paper 2 on next Wednesday. Time for you to answer this question.

Rgds
Sean
SimpleChemConcepts
Learnig Experience with A Difference

Chemistry Questions - Energy Changes

Q)When solid potassium chloride is added to water, the temperature of the mixture falls. What conclusion can be made from this observation?
A. The process is endothermic.
B. The process is exothermic.
C. All solids dissolve with a fall in temperature.
D. Very little potassium chloride dissolves in water.

Anyone would like to share your answers for above Energy Changes questions?

Rgds
Sean
SimpleChemConcepts
Learning Experience with A Difference

Chemistry Questions - Bonding

Q)Which pair of substances is most suitable for the preparation of copper(II) sulphate?
A. Aqueous copper(II) nitrate and aqueous sodium sulphate
B. Copper(II) carbonate and dilute sulphuric acid
C. Copper and dilute sulphuric acid
D. Copper(II) oxide and ammonium sulphate

Takers??

Rgds
Sean
SimpleChemConcepts
Learning Experience with A Difference

Chemistry Questions - Mole Concepts

A Chemistry Question that was posed by a local singapore student that is taking her O level this year.

Which of the following consists of the greatest number of atoms?
A. 4g of hydrogen gas, H2
B. 48g of solid magnesium, Mg
C. 71g of chlorine has, Cl2
D. 24 dm3 of argon gas, Ar at r.t.p.

Any takers??

Rgds
Sean
SimpleChemComcepts
Learning Experience with A Difference