The O Level Chemistry Tuition Centre

O-Level Chemistry: Exam Questions & Tips (Topical)

Written on April 30, 2013 by sean in Announcement, Chemistry Notes & Tips

After communicating with several students, i realised that many come to his Chemistry blog to look for more O Level Chemistry Questions and Solutions/Answers. In fact, you can find them at “Chemistry Notes & Tips” under CATEGORIES on the right hand side column of this blog. Seems like many students are not sure how to find the topics of their interest.

We have decided to improve on the interface of this Chemistry blog in following weeks to make it easier for Chemistry students to maximise their learning. Stay Tuned for it!

Meanwhile, if you are looking for specific O Level Chemistry Topics (or other basic Chemistry syllabus), check the following links for wealth of information and tips:

If you are looking for other topics that is not listed above, do a search on the top right hand corner (i.e. search box) of this blog.

Enjoy reading this blog and improve your Chemistry knowledge and grades!

PS: Feel free to drop me a comment OR forward this blog to your friend

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O-Level Chemistry: Question on Chemical Bonding

Written on April 25, 2013 by sean in Chemistry Guidebooks, Chemistry Notes & Tips

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Today, i will be sharing with you a question on Chemical Bonding found in Pass With Distinction – Chemistry (Topical) book. I wrote this book since year 2011 for Shinglee Publisher Pte Ltd and it contains thought-provoking application questions based on the latest basic Chemistry syllabus.

(You can find the book locally in Popular Bookstores. For overseas, you can get the autographed copy directly from us.)

Let’s us take a look at the question.

Question:

The elements T, X and Y have consecutive, increasing atomic numbers. If element X is a noble gas, what will be the chemical formula of the compound formed between T and Y?

A. T₂Y

B. YT₂

C. TY

D. YT

Now, go take out a piece of paper and work on the question before you scroll down to look at the suggested solution.

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O-Level Chemistry: Measurement of Volumes of Liquids

Written on March 20, 2013 by sean in Chemistry Notes & Tips

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One of the first few topics you learn in O-Level Chemistry (and other basic Chemistry syllabuses) must be Measurement & Experimental Techniques.

The physical quantities that we usually measure are: Mass, Time, Temperature & Volume.

Out of them, measurement of volumes of liquids are considered one of the most important and we need to know the precision / accuracy of the different apparatus.

(Source: Unknown)

Let’s take a look at the different apparatus used for measurement of volumes of liquids:

Measuring Cylinder:

- Measures volumes to the nearest 0.5 cm³

Burette:

- Measures volumes of liquids to the nearest 0.05 cm³
- Used to deliver different volumes of liquids e.g. 24.00 cm³, 28.95 cm³, etc

Pipette:

- Measures out fixed volumes of liquids e.g. 20.0 cm³, 25.0 cm³, 50.0 cm³, etc

Gas Cylinder (BONUS):

- Measures volumes of gases

So far so good?

Let’s take a look at a question then.

Quick Check:

Given the following common laboratory apparatus:

100 cm³ measuring cylinder
100 cm³ beaker
50 cm³ gas syringe
50 cm³ burette
25 cm³ pipette
Mass balance

From the common laboratory apparatus listed above, select the best apparatus to perform each of the following tasks. You may use any of the apparatus once, more than once or not at all.

(a) Measuring 60 cm³ of ethanol

(b) Measuring 25 cm³ of nitrogen

(c) Measuring 23.30 cm³ of dilute hydrochloric acid

(d) Transferring 25.0 cm³ of aqueous sodium hydroxide from a round bottom flask into a beaker

Go do it and leave your answer in the COMMENT section below.

PS: Feel free to share this Chemistry blog with your friends

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