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The air is made up of about 21 percent oxygen. This science projects allows you to find this percentage for yourself through examining a chemical reaction between oxygen and rust.
It is an educational content by education.com.
By clicking on the title of this resource, you will be redirected to the content. If you want to download the project, you just have to join the website, which now is for FREE.
Fecha publicaci?n: 12.5.2016
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