Tag Archive: Organic Chemistry

O Levels Chemistry 2008 Exam Question: Organic Chemistry in Paper 1 (MCQs)-Cont’d

In the previous blgopost we have discussed on 3 MCQ questions on Organic Chemistry that came out in 2008 GCE O Levels Chemistry Exams. Let’s continue with the rest of the MCQ questions that are related to Organic Chemistry.

Question 1: under sub-topic “Carboxylic Acids”

The reaction between a carboxylic acid, CxHyCO2H, and an alcohol, CnH2n+1OH, produces an ester.

How many hydrogen atoms does one molecule of the ester contain?

A.  y + 2n
B.  y + 2n + 1
C.  y + 2n + 2
D.  y + 2n + 3

PS: Tricky question that ALL Pure Chemistry students must know how to answer

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Question 2: under sub-topic “Carboxylic Acids”

O Levels Chemistry 2008 Exam Question: Organic Chemistry in Paper 1 (MCQs)

Hi Students (and parents),

Thank you for all your email enquries on our annual Organic Chemistry Mastery Workshops 2009 for O Level students.

As mentioned that in 2008 GCE O Levels Chemistry Exams, Organic Chemistry plays a large part of the questions that came out in Paper 1 (Multiple Choice Questions) and 2 (Written).

Today i am going to share with you some of the multiple choice questions that came out. I will help you by directing you to the “sub-topics” of Organic Chemistry that the question is based on:

Question 1: Under sub-topic ” Fuels”

In how many of the following can paraffin (kerosene) be used as the energy source?

Aircraft, Air Conditioning Units, Cars, Domestic Cooking, Heavy Lorries, Power Stations

A) 1
B) 2
C) 3
D) 4

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Question 2: under sub-topic “Alkanes”

Which statements are true of alkanes?

1. Their general formulae is CnH2n

Secrets: Why you need to master Organic Chemistry in GCE O Levels?

Hi students,

As mentioned in my previous blogpost, Organic Chemistry is of extreme importance in GCE ‘O’ Levels Chemistry Exams, due to 2 main reasons (based on my analysis of Past Years Exam Papers):

  1. High weightage about 18 – 25 marks (15 – 21%) of your written O Level Chemistry Exams
  2. In Year 2008 O Level Chem Exams, the last Question (Either/Or Question worth 10marks) in Paper 2 are both Organic Chemistry. This means there is no way you can escape Organic Chemistry

Need MORE reasons (that i observed last 3-4 years) why you need to MASTER Organic Chemistry????

1) Organic Chemistry is an independent component that you can master on its own, regardless of how you have fared for other previous chapters

2) Organic Chemistry is in fact VERY EASY - all the 5 chapters/topics in Organic Chemistry are inter-linked and once you master 1 topic, you will be able to master the other topics, with ease once you have the correct methodology

3) Contrary to many students believed that Organic Chemistry needs lots of memorisation, Organic Chemistry DOES NOT need lots of memory work. You just need to associate it to our everyday life and be clear of how each topics are interlinked with each other – and you will score well for it!

4) Majority ALL schools in Singapore (Both GCE O Levels and IGCSE/IB) rushed through Organic Chemistry chapters in June / July in order to finish the syllabus and welcome the School Prelims Exams. Many of the teachers only glanced through it with their students (“surface learning”) in order to finish the syllabus. There are even 1-2 schools (my students are in these schools) that actually asked them to READ ON THEIR OWN!!!! Gosh! You can’t learn Organic Chemistry just by reading textbook? cos concepts are required.

If you are of these students that aim to do well for your GCE ‘O’ Levels Chemistry Exams, i urge you to master Organic Chemistry. Spend time mastering it, please.

If you are facing the following problems in mastering Organic Chemistry, do check out the Early Bird Registration (by 15th July 2009) for our annual O Levels Organic Chemistry Mastery Workshop 2009

I will see you at the workshop! =)

Sean

>> Click HERE to find out more about Organic Chemistry Mastery Workshops

Announcement: O Levels Organic Chemistry Mastery Workshop – Early Bird Registration Starts!

Hi students,

Do you want to learn how to score at least 20 more marks for your Chemistry exam which is less than 3 months away ? If your answer is yes, please read on.

Else, you may forward it to friends who want the marks. We will be conducting an upcoming Organic Chemistry Mastery Workshop 2009 that can help you to score at least 20 more marks in your O Level Chemistry exams regardless of how you fare for previous Chemistry topics.As a gift to my readers of SimpleChemConcepts.com, i would like to first invite you to join us at this workshop before we officially launch it to the public. The best part is, if you hurry, you can enjoy the special “subscriber” early bird price. (But hurry because the normal price will resume once we launch to public)

Q) Why 20 more marks some might asked?

Answer: This is because the weightage of Organic Chemistry in GCE ‘O’ Levels Chemistry Exams is very high. For 2008 papers, it is worth a total of 21 marks!

During the 3 days workshop, get ready to learn:

  • Comprehensive coverage of 100% fundamental concepts of the GCE ‘O’ Level Organic Chemistry syllabus through Associations, Analogies, Applications & Accelerated Learning TechnologiesTM
  • The art of application of basic Organic Chemistry concepts to real examination questions through simple step-by-step approaches
  • The secrets to understand Organic Chemistry quickly and easily without rote learning or facts memorization

As seats are extremely limited, do not miss out this opportunity to learn how to score at least 20 more marks in your Chemistry exam.

>>Click HERE for Early Bird Registration for Organic Chemistry Mastery Workshop 2009<<

See you at the workshop!

To Your Academic Success in Chemistry
Sean Chua
Master Trainer & Author

PS: Workshop will be conducted locally in Singapore.

PPS: This workshop is suitable for both Pure Chemistry & Combined Science (Chemistry) students

PPPS: Registration will stop once seats are all taken up, without prior notice

What would happen when you Master your O Levels Organic Chemistry?

What would happen to your O Level Chemistry Grade when you Master your Organic Chemistry quickly and effectively within 12 hours?

Be Back Here on 5th (Thank you for your patience) July 2009. We have something exciting to announce! =)

O Level Chemistry – Mole Calculation + Organic Chemistry Question

Here is a question sent in via email by an avid student reader of this chemistry blogsite.

Hope to see some suggested answers below and the reasoning/explanation to it.

PS: Remember – Do not be afraid of making mistakes now. I rather you make mistakes now then during your examinations.

Question 1:

20cm3 of a gaseous hydrocarbon was mixed with 100cm3 of oxygen and the mixture sparked so that the hydrocarbon was completely burnt. The volume of gas remaining at the end of the combustion was 70cm3. After passing over soda lime, this volume was reduced to 10cm3. All gases were measured at 25C and at the same pressure.

(a) What volume of oxygen gas remained unburnt at the end?
(b) What volume of oxygen gas was used in the combustion?
(c) What volume of carbon dioxide was produced in the combustion?
(d) Deduce the formula of hydrocarbon.

Organic Chemistry Mastery Workshop – Successful Completion

It was another Awesome event! In 2 days (in fact in 8hrs plus) we managed to share our knowledge on Organic Chemistry to a group of students committed to their success, and ensuring that they are equipped with all the essential basic concepts to handle all kinds of application questions in upcoming major chemistry examinations.

We have touched base comprehensively on Fuels and Introduction, Homologous Series, Functional Groups and the Physical & Chemical Properties of all families of organic compounds. We have also covered extensively on Macromolecules with lots of industrial and everyday life examples.

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Graduation Class Photo

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Smiles all over..

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Macromolecules in Actions

Following are some of feedbacks by our students that attended the Organic Chemistry Mastery Workshop:

“This magnificent workshop has truly benefitted me a lot by making me understand all my doubts about Chemistry (especially Organic Chemistry). Aside from that, it has motivated me to out in more effort in Chemistry. This is more motivational than other learning & motivationak organisations like XXXX XXXX who simply charges but yet their purpose is still not achieved. Mr Sean Chua would definitely receive more of my support in future and i will certainly recommend others to him.”
Chua Tok Sheng, Bedok South Sec School

“The pace of this workshop if just right and this has been an educational yet enjoyable experience. Sean has made learning chemistry both fun and informative with his comical actions and witty jokes. I would definitely attend more of his workshops in the future. Thank you for changing my impressions of chemistry.”
Leonard Tan, St. Andrews School

“My school teacher rushed through the Organic Chemistry topics so i don’t understand it. This workshop helped me to understand all about Organic Chemistry and the notes provided are very useful.”
Edwin Soh, Gan Eng Seng School

“I think it has opened my mind to much newer knowledge in which i would never get the chance to learn in my school. Also, the explanations are very clear and precise which would not create confusion or which makes me have problem understanding.”
George Chan, Queensway Sec School

“Better than my school. Mr Chua go through the basics essential concepts first, which is better which allows me to get my foundation right.”
Audrey Auyong, CHIJ (TP)

“Sean Chua helped me to reinforce my understanding of Organic Chemistry. I find his method of teaching very novel.”
Cai Wenrui, Saint Joseph’s Instituition

“This program has definitely benefitted me a lot. I have learnt more than what i have learnt in schoola and learnt how Organic Chemistry is applicable to our everyday life, This programme is different from others i have attended as it involves a closer interaction to life and science. I would recommend my friends about their programmes.”
Marcus Goh Kang Rong, Queensway Sec School

“This programme has helped me revised for Organic Chemistry. I feel confident of getting an A1 for my O Level Chemistry.”
Martin Huang, Swiss Cottage Sec School

” I leaned much more on Organic Chemistry that my school teahcer has not covered. And i understand more on those parts that i was not familiar with. The pace is just right.”
Sheryl Lim, Queensway Sec School

” I think this Organic Chemistry Workshop is good! It helps me to understand the topic alot better, as well as it helps me with my upcoming test (to prove to my Chemistry teacher that i can pass for this Topic!!!!)”
Ang Jing Ting, Fuhua Sec School

“Once again, Mr Chua has been able to provide more understanding to the Chemistry Topics that i do not understand. Although i had not learnt Organic Chemistry before, his 8 hrs workshop has let me understood much more about it. His notes are very useful. The course has benefitted me as i learnt so much in just 8hrs.”
Kwee Jun Wei, Maris Stella High School

“The pace was just right! I have learnt more about Organic Chemistry chapter. Thanks alot!”
Joscelin Chew, NanHua High School

“I learnt and understood more about Organic Chemistry. The notes are helpful and now i can remember more about Organic Chemistry. Thanks Alot Sean!”
Lim Shi Ping, Zhonghua Sec School

>> Click here to see more well-wishes and testimonials from parents & students on Sean’s Chemistry Coaching!