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Popularity: 31%

Check this youtube video out on Ionic Bonding.

Simple for understanding.

Popularity: 40%

I was surfing on the internet and came across this short youtube video on Covalent Bonding.

Thought the explaination is simply presented and you may find it beneficial for your learning.

Covalent Bonding is defined as bonding of 2 or more atoms by the sharing of electrons.

PS: This is not my video on youtube, but uh huh..perhaps i should also look into making appropriate videos on Chemistry Concepts in order to help you to learn better.

Popularity: 39%

All my students have heard me talked about the doing experiments in “real” laboratories as well as the life of a chemists in the laboratories. Recently, i was at one of the local university and was managed to get a few pictures of undergraduates having their practical sessions in the academic laboratory. I thought it would be beneficial to let those students that are considering to further their higher educational studies in the specialized areas of Chemistry, to have a better idea with some pictures of work in laboratories.

Many of the local students would have gotten their Mid-Year Examination results or are getting it soon. Some would be feeling ecstatic while others will be asking themselves if they have put in enough efforts in preparing for that examinations.

For those that did very well, i would like to congratulate you and do Keep Up The Good Work! But always remember not to get complacent with this Mid-Year results and neglect your preparation for upcoming Prelims and GCE O Levels Examinations. Too often, we have seen top scorers for Mid-Year Exams fumble in the more important major exams like Prelims and GCE O Levels - all due to the simple word ‘complacency’

Recently, i received several enquiries and questions from students on the color of copper hydroxides and copper carbonates.

I understand why the confusion. This is because in the local Secondary Schools, many of the Science (Chemistry) teachers are only showing the students of the Blue Color PPT when they test for the Cu2+ cation using alkaline solution such as dilute NaOH or aqueous Ammonia Solution. The Blue Color PPT are due to the formation of insoluble Copper Hydroxide which is very distinct.

Many of students are confused and thought all Copper Salts have a Blue Color PPT. This is certainly NOT TRUE.

Popularity: 31%

In SPA on Qualitative Analysis, the Aim in the experiment is to assess on your ability to:
–> Make observations and readings and record them in a suitable format.

With this in mind, most of the time, they will give you all kinds of unknown samples and ask you to carry out a series of tests and note down your observations. In the end, you will be prompted with more questions and eventually they will ask you to identify the unknown sample.

Question might go like this:

Several parents and students alike have asked me on the possible practical questions that can come out for the SPA examinations.

I have this to say - SPA is in fact very very simialar to the GCE O Level Practical Examinations that we had last time.  There is not much difference between the chapters/topics that we have studied for the last 10 years. Basic Chemistry is essentially Basic Chemistry. The theories does not differ that much during the 10 - 20 years period. As such, all the practicals experiments will always revolves around the few main topics and you should be aware of it.

Many students have been asking me on the things that need to take note when they are doing their SPA, and how not to loose marks to their teachers that have their “eagle eyes” on them.

School-based Science Practical Assessment (SPA) is a pretty new initiative by the Singapore’s Ministry of Education (MOE) to test the students on their ability to follow procedures correctly when carrying out an experiment to test for a certain theory or concepts.