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?

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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.

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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

GCE O Level A-Math Topical Revision Programme

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!