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O-Level Chemistry: Score 100% MCQ Workshop Closing…

Written on October 12, 2011 by sean in Announcement, Chemistry Coaching, Exam Strategies

Note: This blog post is more for students taking the GCE O-Level Pure Chemistry Examination in Singapore

Every year during this period, i will share with students (and their parents) how they can boost their Chemistry grade even if they didn’t do well in your Paper 2 (Structured Questions). It’s by focusing their attention and energy on Multiple Choice Questions (MCQ) Paper 1.

It requires sheer determination!

I know exactly how you will feel with most papers completed and just the MCQ Papers towards the end of O-Level. I’m here to help: I’m here to keep you from being complacent, I’m here to help you to prepare confidently for your final dash!

Score 100% in Chemistry MCQ will definitely boost your results! Its weighting is 30%!

Also, the early bird registration for Score 100% MCQ Mastery Workshop is closing this Sunday, 16 October 2011.

Click here to register.

If you’re committed to scoring your A for Pure Chemistry, I invite you to join us.

Date: 12 November 2011
Time: 9 am – 5 pm
Venue: Kaplan City Campus @ Wilkie Edge, Selegie Road.
Suitable for: GCE O-Level Pure Chemistry Candidates 2011

We are left with 10 seats 8 seats only. Register now!

Click here to register.

“It is good that Sean has organized this workshop to focus on the MCQ of Chemistry paper as it is often a paper that teachers and students alike will neglect. Through the workshop, he covers tricky and common MCQ questions, which is very helpful. His cheerful and lively teaching approach learns to keep everyone awake and in focus. Thanks Sean for everything! Definitely recommended to other students in future.”

- Edna Chan Zhi Yin, Hougang Sec School

May the force be with you,
Sean Chua
Master Trainer (Chemistry) & Author

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O Level Chemistry: Question on Periodic Table & Group Trends

Written on October 4, 2011 by sean in Chemistry Notes & Tips

2 Comments

In the previous blog post, we have discussed on the Group Trends of the Halogens (Group VII elements).

Today, i shall discuss with you an exam-based multiple choice question (MCQ) that test you on your concepts on Group Trends.

Below is an exam-based question send in by one of Sec 3 (2011) O-Level Pure Chemistry student:

Question:

HELLO MR CHUA;
i have chem P2 on friday and i did my school’s past year paper. i asked my teacher this qn, but i don’t understand D:
the ans is D but i don’t understand why (:
Which is most likely to be the most stable compound?
A. NaCl
B. RbCl
C. NaF
D. RbF ( D )

Suggested Solution:
Before we start, you need to understand which topic they are testing you on. On the first look, it seemed to be question on Chemical Bonding topic.

But once you realised they asked you about “stability” of the compounds, you need to know they are in fact asking about the chemical reactivity of Group I and VII elements, and thus the stability of the ionic compound that is formed.

The most stable compound must be made up of the most reactive metal and the most reactive non-metal for an ionic compound.

Group I Trend: Reactivity increases down the Gp I i.e. Rb is more reactive than Na

Group VII Trend: Reactivity decreases down the Gp VII i.e. F is more reactive than Cl

As such, RbF (D) will be the most stable compound among the four choices.

Hope you are learning something useful here. Feel free to forward this blog post to your friends if you think they can benefit from it. Keep sharing =)

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O Level Chemistry: Question on Chemical Bonding

Written on August 19, 2011 by sean in Chemistry Notes & Tips

1 Comment

Chemical Bonding is an important topic to learn for Chemistry. In fact, fundamentally, it is one of the most important topic that is related to other topics in O-Level Chemistry (and equivalents).

There are 3 types of Bondings:

Ionic Bonding
Covalent Bonding
Metallic Bonding

Today, we will discuss a question on bonding that was sent by a Sec 4 O-Level Chemistry student. I reckon that the question was taken from his school’s preliminary examination paper.

Now, first we need to recognise that the substance is a covalent compound, meaning only covalent bonding exists in the molecule.

To recap, the element that is involved in bonding can have maximum of only 8 valence electrons (exception: Hydrogen with maximum of 2 valence electrons) around itself after bonding.

The 8 electrons can be bonded and can also be unbonded.

Answer is (B) i.e. X = Nitrogen; Y = Silicon and Z = Hydrogen

Reasons as follows:

Nitrogen is in Group V –> has 5 valence electrons –> 3 electrons used for covalent bonding + 2 unbonded valence electrons
Silicon is in Group IV –> has 4 valence electrons –> all 4 electrons are used for covalent bonding
Hydrogen has only 1 valence electron –> electron is used for covalent bonding

Hope you are learning something useful in this post.

PS: If you think this is beneficial to your friend, feel free to forward them this website. =)

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