Ib Extended Essay Subject Areas 2013

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Title Analysis of strawberry jellies by paper chromatography Research question The use of paper chromatography to determine whether strawberry jellies obtained from 24 different countries in 5 different continents all contain the same red dyes.

Treatment of the topic An extended essay in chemistry may be based on literature, theoretical models or experimental data.

“ The ratio of the gases evolved at the positive electrode during the electrolysis of common salt solution” is better than “ Electrolysis of solutions”.

“ Spectrophotometric determination of trace amounts of lead in drinking water” is better than “ Water analysis”.

Students should indicate clearly whether they have personally designed the experiment, or give the source of an existing experiment method that they have used and state how they have adapted and improved upon it.

All essays must be supervised by a school supervisor.

Title The ratio of the gases evolved at the positive electrode during the electrolysis of common salt solution Research question Is there a relationship between the concentration of aqueous sodium chloride solution and the ratio of the amounts of oxygen and chlorine gas that are evolved at the positive electrode during electrolysis.

Title The caffeine content of a cup of tea Research question Does the time it takes to brew a cup of tea using a specific commercial brand of tea leaves significantly alter the amount of caffeine that is dissolved in the drink?

Although the same assessment criteria apply to all extended essays, for an extended essay submitted in chemistry the topic chosen must allow an approach that distinctly involves chemistry.

Where a topic might be approached from different viewpoints, the treatment of the material must be approached from a chemistry perspective.


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