If you want an affordable and quality education, come and find out more at Tar College Open Day.
Friday, December 4, 2009
Tar college Open day
If you want an affordable and quality education, come and find out more at Tar College Open Day.
Wednesday, November 4, 2009
Yew Shy Gin
On 2nd November 2009, three Utar students drowned after they were swept away by strong current during an outing to Batu Berangkai Waterfall, Kampar. (my hometown). One of them is Yew Shy Gin.
I used to go to this waterfall when I was a student. Well, this place is quite dangerous especially after it rains as there will be a water gush from the top.
By the way, Shy Gin did her A-level in Tar College.
She was my former student from the class of SN7c.
Rest In Peace
My condolences to her family.
I used to go to this waterfall when I was a student. Well, this place is quite dangerous especially after it rains as there will be a water gush from the top.
By the way, Shy Gin did her A-level in Tar College.
She was my former student from the class of SN7c.
Rest In Peace
My condolences to her family.
Friday, October 23, 2009
Trial Exam Sept 2009 Paper 1 and 2
Sorry, for the long silence. Take me some time to look for the soft copy.
Paper 1
Ans for Paper 1
Paper 2
Ans for Paper 2
Paper 1
Ans for Paper 1
Paper 2
Ans for Paper 2
Saturday, September 12, 2009
Saturday, August 8, 2009
A2 Quick Revision Notes
Quick revision downloaded from lanther.co.uk
http://www.4shared.com/file/123745687/3d38ace0/A2_notes.html
http://www.4shared.com/file/123745687/3d38ace0/A2_notes.html
Thursday, July 16, 2009
Video on Nanotechnology
For those who want to watch again the video on nanotechnology which I had shown in my previous class , please click the link below:
http://www.youtube.com/watch?v=JqMh5NYsRck
http://www.youtube.com/watch?v=8Kg_Lyg_qcM&feature=related
http://www.youtube.com/watch?v=JqMh5NYsRck
http://www.youtube.com/watch?v=8Kg_Lyg_qcM&feature=related
Saturday, July 4, 2009
Symbols in marking scheme and guide to writing a good answer
Symbols used in marking scheme:
/ - means that the responses are alternatives and either answer should receive full credit.
( ) - means that a phrase/word is not essential for the award of the mark, but helps the
examiner to get the sense of the expected answer.
Phrases/words in bold - means that the phrase or the actual word is essential to the answer.
Ecf (error carried forward)- means that a wrong answer given in an earlier part of a question is
used correctly in answer to a later part of the same question.
Guide to writing a good answer
1) Make the meaning of your answer clear to the examiner.
2) Make sure that the answer makes sense.
3) Answers must be in the correct context. In other words, your answers must answer the
questions.
4) Write legibly – the examiner must be able to read your handwriting and the font of your
handwriting should be big enough for them to read easily. Don’t forget, most examiners are
40s or 50s something and many of them are short-sighted.
5) Your words or sentences should have the accurate use of spelling, grammar and punctuation
in order to make the meaning clear.
6) Organise information clearly and coherently.
7) Use specialist vocabulary when appropriate.
/ - means that the responses are alternatives and either answer should receive full credit.
( ) - means that a phrase/word is not essential for the award of the mark, but helps the
examiner to get the sense of the expected answer.
Phrases/words in bold - means that the phrase or the actual word is essential to the answer.
Ecf (error carried forward)- means that a wrong answer given in an earlier part of a question is
used correctly in answer to a later part of the same question.
Guide to writing a good answer
1) Make the meaning of your answer clear to the examiner.
2) Make sure that the answer makes sense.
3) Answers must be in the correct context. In other words, your answers must answer the
questions.
4) Write legibly – the examiner must be able to read your handwriting and the font of your
handwriting should be big enough for them to read easily. Don’t forget, most examiners are
40s or 50s something and many of them are short-sighted.
5) Your words or sentences should have the accurate use of spelling, grammar and punctuation
in order to make the meaning clear.
6) Organise information clearly and coherently.
7) Use specialist vocabulary when appropriate.
Tuesday, June 30, 2009
Change of ph to f
CIE has changed the following terms:
New term for sulphate is sulfate
thiosulphate is thiosulfate
sulphite is sulfite
sulphur is sulfur
disulphide to disulfide
New term for sulphate is sulfate
thiosulphate is thiosulfate
sulphite is sulfite
sulphur is sulfur
disulphide to disulfide
Saturday, June 27, 2009
Xtreme link
Change of Xtremepaper link
http://www.planet-master.com/
Many thanks to you, Leong Seek for your information
http://www.planet-master.com/
Many thanks to you, Leong Seek for your information
Wednesday, June 3, 2009
Important Notice
To all students taking AS and A2 Examinations:
You are reminded again that you are not allowed to discuss anything about the question papers in the forum or blog within 24 hours after your paper. Don't forget some of the candidates in other parts of the world have not sat for the papers due to the different time zones. Failure to observe this rule means you are in trouble. Good luck
You are reminded again that you are not allowed to discuss anything about the question papers in the forum or blog within 24 hours after your paper. Don't forget some of the candidates in other parts of the world have not sat for the papers due to the different time zones. Failure to observe this rule means you are in trouble. Good luck
Sunday, May 31, 2009
Saturday, May 16, 2009
Think before you use
Waste decomposition Rate
Styrofoam is not composed
Plastic bottle takes at least 1 million years
Disposable diaper 500 to 600 years
Aluminium tin 200 to 500 years
Leather shoes 40 to 50 years
Newspaper 1 month
Styrofoam is not composed
Plastic bottle takes at least 1 million years
Disposable diaper 500 to 600 years
Aluminium tin 200 to 500 years
Leather shoes 40 to 50 years
Newspaper 1 month
Source : Star
Tuesday, May 5, 2009
Never judge a book by the cover
I was truly astounded by the talent of Susan Boyle when I watched her singing on the Britain's Got Talent (from Youtube). Her performance received a standing ovation from the live audience and later took the world by storm. The numbers who watched her videos on her audition have climbed to almost 200 millions and the figure is still growing.
What's so special about her? She is a 47 years old lady whose appearance is #@?/... but possess a golden voice. Watch her sing and you would understand what I meant.
http://www.youtube.com/watch?v=9lp0IWv8QZY
What's so special about her? She is a 47 years old lady whose appearance is #@?/... but possess a golden voice. Watch her sing and you would understand what I meant.
http://www.youtube.com/watch?v=9lp0IWv8QZY
Sunday, April 26, 2009
Wednesday, April 15, 2009
AS Practical Guide II
Guide to Potassium manganate(VII) titration
· For KMnO4 titration, no indicator is added because KMnO4 acts as its own indicator and it would change to pale pink colour at the end point.
· KMnO4 titration is used to determine the concentration of Fe2+ (Iron(II) ions) , H2O2 (hydrogen peroxide) and C2O42- (ethanedioate).
· KMnO4 titrations must be carried out in acidified condition because in neutral or alkaline solution, brown solid MnO2 is formed and as a result it would be difficult to detect the end point.
· To acidify, sulphuric acid is used and not other acids such as hydrochloric acid and nitric acid because the chloride ions or nitrate ions would also be oxidised.
· Most KMnO4 titrations should be carried out at room temperature except titration involving C2O42- which is normally carried out at 70 oC. For ethanediote, any temperature lower than 70 oC could cause the precipitation of MnO2.
· Titration using KMnO4 solution should be carried out slowly. A brown precipitate of MnO2 is formed when KMnO4 is dropped from the burette too quickly.
.
Guide to Iodine-thiosulphate titration
· Starch is used as an indicator in this titration
· The starch solution should not be added at the beginning of the titration. The reason is at this stage, there is a high concentration of iodine and iodine would be adsorbed onto the starch molecule.
· The starch solution should be added towards the end of the titration when the reaction mixture turns pale yellow. (Warning: not too pale as you may overshot the endpoint)
· The starch solution will produce a dark blue colour with iodine.
· At the end point ,the solution turns colourless.
· Be careful, the solution may become blue again due to the atmospheric oxidation of iodide (from potassium iodide). You shouldn’t continue titrating again.
· For KMnO4 titration, no indicator is added because KMnO4 acts as its own indicator and it would change to pale pink colour at the end point.
· KMnO4 titration is used to determine the concentration of Fe2+ (Iron(II) ions) , H2O2 (hydrogen peroxide) and C2O42- (ethanedioate).
· KMnO4 titrations must be carried out in acidified condition because in neutral or alkaline solution, brown solid MnO2 is formed and as a result it would be difficult to detect the end point.
· To acidify, sulphuric acid is used and not other acids such as hydrochloric acid and nitric acid because the chloride ions or nitrate ions would also be oxidised.
· Most KMnO4 titrations should be carried out at room temperature except titration involving C2O42- which is normally carried out at 70 oC. For ethanediote, any temperature lower than 70 oC could cause the precipitation of MnO2.
· Titration using KMnO4 solution should be carried out slowly. A brown precipitate of MnO2 is formed when KMnO4 is dropped from the burette too quickly.
.
Guide to Iodine-thiosulphate titration
· Starch is used as an indicator in this titration
· The starch solution should not be added at the beginning of the titration. The reason is at this stage, there is a high concentration of iodine and iodine would be adsorbed onto the starch molecule.
· The starch solution should be added towards the end of the titration when the reaction mixture turns pale yellow. (Warning: not too pale as you may overshot the endpoint)
· The starch solution will produce a dark blue colour with iodine.
· At the end point ,the solution turns colourless.
· Be careful, the solution may become blue again due to the atmospheric oxidation of iodide (from potassium iodide). You shouldn’t continue titrating again.
Monday, March 30, 2009
Good luck
The AS Mock exam started today. Good luck to those who are taking the exam. I would be extremely busy these coming few weeks. First, I am involved in the time-table committee. I can foresee myself sitting for hours to come out with the new timetables for both the students and the teachers for the next Semester. The only good thing is I can prepare my own timetable to my likes.
Second, 'tons' of students' answer scripts waiting for me. I have five classes under my charge. Not only that, with different styles of handwriting: artistic type, doctor type, miniature type, hilly type (the one with the gradient at 45 degree), my eyesight power will double after that.
Third, need to plan for the coming AS practical exam. (Please don't ask me what will be coming out. Even I am 'tortured' or offered a bribe , I won't reveal a single thing.)
Fourth, need to complete my new book before the deadline.
Fifth...sixth...etc. Who said teaching is easy? Salary is low and plenty of work. The only reward is a good karma or maybe a place in the heaven. That would keep me motivated when I think of that.
Second, 'tons' of students' answer scripts waiting for me. I have five classes under my charge. Not only that, with different styles of handwriting: artistic type, doctor type, miniature type, hilly type (the one with the gradient at 45 degree), my eyesight power will double after that.
Third, need to plan for the coming AS practical exam. (Please don't ask me what will be coming out. Even I am 'tortured' or offered a bribe , I won't reveal a single thing.)
Fourth, need to complete my new book before the deadline.
Fifth...sixth...etc. Who said teaching is easy? Salary is low and plenty of work. The only reward is a good karma or maybe a place in the heaven. That would keep me motivated when I think of that.
Tuesday, March 24, 2009
Tuesday, March 17, 2009
Practical P31/32 (Part 2)
Maximum error
Maximum error is usually marked on the glassware.
Burette
• A pipette has a maximum error of 0.05 cm3 in each measurement.
Calculation of percentage error
Percentage error = (maximum error ÷ quantity measured ) x 100%
Reading burettes
A burette is graduated in divisions every 0.1 cm3.
Using the half-division rule, the estimation is 0.05 cm3.
Burette is recorded to two decimal places with the last figure either ‘0’ or ‘5’.
The maximum error in each measurement = 0.05 cm3.
The overall maximum error in any volume measured always comes from two measurements, so
the overall maximum error = 2 x 0.05 cm3 = 0.1 cm3.
In a titration, a burette will typically deliver about 25 cm3 so the percentage error is small.
Percentage error = (2 × 0.05 ÷25.00) x 100% = 0.4%
The percentage error becomes more significant when burette is used to deliver small volume
For delivery of 2.50 cm3,
Percentage error = (2 × 0.05 ÷ 2.50)× 100% = 4%
Maximum error is usually marked on the glassware.
Burette
• A pipette has a maximum error of 0.05 cm3 in each measurement.
Calculation of percentage error
Percentage error = (maximum error ÷ quantity measured ) x 100%
Reading burettes
A burette is graduated in divisions every 0.1 cm3.
Using the half-division rule, the estimation is 0.05 cm3.
Burette is recorded to two decimal places with the last figure either ‘0’ or ‘5’.
The maximum error in each measurement = 0.05 cm3.
The overall maximum error in any volume measured always comes from two measurements, so
the overall maximum error = 2 x 0.05 cm3 = 0.1 cm3.
In a titration, a burette will typically deliver about 25 cm3 so the percentage error is small.
Percentage error = (2 × 0.05 ÷25.00) x 100% = 0.4%
The percentage error becomes more significant when burette is used to deliver small volume
For delivery of 2.50 cm3,
Percentage error = (2 × 0.05 ÷ 2.50)× 100% = 4%
Tuesday, March 10, 2009
Practical 31/32 Learn More (Part 1)
1. Titres should be within 0.20 cm3.
2. Candidates were expected to produce a single table.
3. The table should include correct headings and units.
4. Burette readings and the volumes added recorded to the nearest 0.05 cm3.
5. Select appropriate scales when plotting a graph
6. In plotting graph, a line should be best-fit straight line or a smooth curve.
7. A graph should contain at least five ponts.
8. Answer for calculation should be given to at least 3 significant figures
9. Thermometer readings and temperature differences expressed to the nearest 0.5 °C,
10. All weighings and the masses of the solid used should be recorded consistently to 1 decimal place or 2 decimal place depending on the sensitivity of the electronic balance. The balance in our lab can measure up to 2 decimal points.
11. To calculate mcT equation, the m is the mass of solution not the mass of solid.
12. +ve sign or –ve sign should be written on the H value.
13. Common error in thermochemistry experiments:
· heat loss/gain with the surroundings
· acid spray from the vigorous reaction
· the use of a thermometer calibrated by 1 °C
14. Suggested improvement for thermochemistry experiments :
· Suitable additional insulation or use of a lid
· Use of a thermometer with closer graduation or use of a digital thermometer
2. Candidates were expected to produce a single table.
3. The table should include correct headings and units.
4. Burette readings and the volumes added recorded to the nearest 0.05 cm3.
5. Select appropriate scales when plotting a graph
6. In plotting graph, a line should be best-fit straight line or a smooth curve.
7. A graph should contain at least five ponts.
8. Answer for calculation should be given to at least 3 significant figures
9. Thermometer readings and temperature differences expressed to the nearest 0.5 °C,
10. All weighings and the masses of the solid used should be recorded consistently to 1 decimal place or 2 decimal place depending on the sensitivity of the electronic balance. The balance in our lab can measure up to 2 decimal points.
11. To calculate mcT equation, the m is the mass of solution not the mass of solid.
12. +ve sign or –ve sign should be written on the H value.
13. Common error in thermochemistry experiments:
· heat loss/gain with the surroundings
· acid spray from the vigorous reaction
· the use of a thermometer calibrated by 1 °C
14. Suggested improvement for thermochemistry experiments :
· Suitable additional insulation or use of a lid
· Use of a thermometer with closer graduation or use of a digital thermometer
Sunday, March 1, 2009
Subscribe to:
Posts (Atom)
