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Saturday, 2 February 2019

Updates on App - 2019 Q1

Dear readers,

Many thanks for downloading the Apps created for this website and for the valuable feedback. As I mentioned in the previous post, the Apps will be unpublished by 1 Feb 2019. At the time of this writing, all the Apps have been unpublished. Once again, many thanks for your comments and feedback.

The Apps were initially created to cover a single topic per App, but I get from feedback that many prefer more topics to be covered in each App. You will be looking forward to Apps with more content, questions and a standardized format in the near future. While this may mean you need more data storage space, this has become so cheap nowadays, and I get from readers that this is no longer the concern. Thus, the change in direction for the Apps for this website.

Stay tuned for updates in future and for now, Happy Chinese New Year to all my Chinese readers!

Tuesday, 15 January 2019

New Direction of the blog in 2019

How time flies, and we are on a new year. I set some goals to achieve with this blog each year. Last year we focused on bringing our content to the ubiquitous mobile phones with Apps. Many thanks for downloading and trying out. I am reviewing the Apps recently, and felt that they should be revamped to provide even more content. Going forward, a new format will be created for my Apps and all those that cannot be modified to follow the new format will be permanently be unpublished. So if you like, download those Apps from here first. I will be deleting the old Apps in phases starting from 1 February 2019.

Stay tuned to an even better Chemistry Resource App and blog!

Tuesday, 4 December 2018

Acid Base Equilibrium

All the posts in this blog has and had been written  for O level, with students sitting for the Singapore- Cambridge O level syllabus as a focus. With the O levels being over, I am looking at providing you with some insights with what A level chemistry is about. Of course, these resources will also be useful for those who are taking the A levels.

One of the topic which many A level students find difficult is that on acid- base equilibrium. I have create an app with flash cards as well as a quiz. It is now available for download at play store here.

Would really appreciate if you provide me with comments on how you find this App.


Thursday, 3 May 2018

Dot- and- cross diagrams for simple covalent molecules

I was doing some research online today, when I chanced upon the GCSE Chemistry syllabus. You can take a look here. In the part on covalent bonding, the syllabus states that

Students should be able to: draw dot and cross diagrams for the molecules of hydrogen,chlorine, oxygen, nitrogen, hydrogen chloride, water, ammonia and methane.........
When I saw this, my first thought was that students taking this exam should really score on questions on drawing dot and cross diagrams of molecules (note, under ionic compounds, this syllabus include other compounds which dot and cross diagram students need to know). The syllabus has specifically mentioned drawing these eight covalent molecules. Just practice drawing these many times, and you will score on this question.

Well, I have previously wrote a few blog posts detailing how to draw the dot- and- cross diagrams. You can find them here:
Drawing dot and cross diagrams (showing all electrons)
Drawing dot and cross diagrams (showing outermost electrons)

For the O level syllabus that Singapore students sit for, please note that you are not only restricted to drawing these eight molecules.

I have created two videos on drawing the dot and cross diagrams for these eight molecules, namely hydrogen,chlorine, oxygen, nitrogen, hydrogen chloride, water, ammonia and methane. One video shows the dot and cross diagrams with the outermost electrons only and another shows all the electrons.

Related Posts

Tuesday, 1 May 2018

Saturday, 21 April 2018

Redox Quiz App

The redox chapter for O level is one that involves mainly application. In this Redox Quiz App, we are doing exactly that --- application. You will be given an equation, and determine whether which species is being oxidized or reduced; whether it is an oxidising or reducing agent. What's more, you get to choose what you want to test yourself on.

This App is now avaliable for download here.

Related Post
- Redox Reactions
- Redox Videos

Quizzes and Tests on Redox Reactions

Tuesday, 3 April 2018

Ethalpy Change App - Exothermic or Endothermic

The enthalpy change chapter is a relatively short one, covering the differences between exothermic and endothermic reactions.

In this App that I have created, you will be given equations, reactions, and description. From there, you will decide whether it is an exothermic or endothermic reaction. This App is written based on the O Level Chemistry syllabus, and would be a handy tool for you to test your knowledge of the heat of reaction chapter on the GO.

The App is available for download on Google Play store here.

Related Post
Endothermic and Exothermic Reactions

Quizzes and Tests on Endothermic and Exothermic Reactions

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