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.

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Endothermic and Exothermic Reactions

Questions
Quizzes and Tests on Endothermic and Exothermic Reactions

Organic Chemistry App - Alkanes, Alkenes, Alcohols and Carboxylic acids

Want to know how well you know the organic chemistry chapter?

To test your basic knowledge on these homologous series (i.e. alkanes, alkenes, alcohols and carboxylic acids), I have created two new Apps available for download at Google Play:

Each App consists of a number of questions, with answers. In each question, there is a short description, and one is supposed to determine the homologous series which best fits the description. Going through these questions, will reinforce the key concepts tested in the O level Organic Chemistry.

We usually have some small pockets of time available. And many of us make use of them by "looking" at our smart phones. What do you usually do when you "look" at your smart phone? I have a suggestion. Why not revise some topics that you have learnt? I have created a number of Apps which can allow you to revise small parts of your Chemistry syllabus quickly. You can find them here

Electrolysis - What's at the anode and cathode?

The content part for the electrolysis chapter is relatively short. You can learn in detail here. It is the application of theory to questions that is more important here. There is not much to memorise.

Instead of creating flash cards with content for this chapter, the first App for electrolysis is one which has a number of questions. This is because questions for this chapter are rarely those that require you to regurgitate. Rather, they are more of the application type. This App gives you application questions on finding what is formed at the cathode and anode for a given electrolyte.

If you would like to learn electrolysis on the GO, by looking at example questions, download the Electrolysis App, now available at google play store here.


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Chemistry App - How to find number of electrons in particles

I would like to share a new app now available on Google Play store, available for download for free here.

https://play.google.com/store/apps/details?id=com.chemistryforsg.FindNumberofElectrons&hl=en


This App teaches both how to find the number of electrons in particles (e.g. atoms, cations or anions). To reinforce what you have learnt in the short notes in this app, there is also a quiz.

Learning how to find the number of electrons is particularly important for the chapter on chemical bonding, such as finding the electronic configuration.

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Hydrogen Peroxide Disproportionation - Video Sharing

In the notes on redox, we mention that hydrogen peroxide can be oxidized or reduced, depending on what other chemical is added to it.


When hydrogen peroxide is oxidized, it is converted to oxygen.

When hydrogen peroxide is reduced, it is converted to water.

Hydrogen peroxide can also undergo disproportionation, which means it is oxidized and reduced simultaneously. Water and oxygen is formed when this reaction takes place, as illustrated in the equations below:

hydrogen peroxide --> water + oxygen


2H2O2 ---> 2H2O + O2

The following is a cute video showing the disproportionation of hydrogen peroxide: