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Edexcel International GCSE Chemistry
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Links for Chapter 6: Rates of Reaction

Video clips and animations

Catalytic decmposition of hydrogen peroxide

Addition of manganese(IV) oxide to some very concentrated hydrogen peroxide solution. YouTube

Effect of concentration on rate of reaction

The reaction between zinc and two different concentrations of hydrochloric acid. It isn't at all obvious from the video that different concentrations are being used, but it is stated on the web page, and is clear from the results. This comes from the Ministry of Science and Technological Development in the Republic of Serbia, but the embedded video comes from YouTube. There are stills from the video if you want to save bandwidth.

Catalytic oxidation of ammonia

Oxygen bubbled through concentrated ammonia solution in the presence of a platinum wire catalyst. Don't worry about the unfamiliar reaction. It is just an explosive reaction between ammonia and oxygen on the surface of a hot platinum wire. YouTube

Activation energy in the reaction between hydrogen and chlorine

The presence of UV light provides enough energy to break the bonds between chlorine atoms to get the reaction started. The reaction is explosive and blows the bung out of the tube - that's not clear until the final shot. YouTube


Instructions for practical work

I have referred to practicalchemistry.org as a reliable source of instructions for experiments. If you find anything really good from other sources, could you let me know via the address on the about this site page of Chemguide.

Rates of reaction experiments

The menu of intermediate level rate of reaction experiments from practical chemistry.org

Showing the involvement of a catalyst during a reaction

This comes from the menu above, but I wouldn't want you to overlook it. It is one of my favourite rates demonstrations, showing how cobalt ions acting as a catalyst are dramatically changed during the reaction, but revert to their original colour at the end.


Other useful or interesting sites

Rates of reaction on Chemguide

You might be interested in a slightly more in-depth look at rates of reaction. This link will take you to the rates of reaction menu on Chemguide. Although it is aimed at A level, you should be able to understand most of the "Basic descriptive topics". Do, however, remember that this is beyond GCSE, and don't worry if some of it doesn't mean anything to you at this stage.

Bombardier beetles

More from the BBC about this strange creature.

Bombardier beetles (continued)

Describes the chemistry of the processes used in a simple way, and points out the controversy concerning how the creature arose.


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© Jim Clark 2009