Good Teaching Practices | Page 33

What we get with this activity?  Our students have investigated about composting process.  They have learnt about chemical reactions and changes.  They have been involved in a sustainable development activity.  They will verify their working result next year. 1. Cromatography We have used a cromatrography as a method of separating the pigments of an orange tree leaf. The leaves can have three different pigments, chlorophyll, carotenes and xanthophylls however most extensive one is chlorophyll. As we can see in colour of leaf. Students have studied this method as curriculum contents and later they have practised in lab.The subject reference is "Applied Sciences" for 4 th ESO. The steps can be summarized in the following: cut and crush the orange tree leaves, add alcohol, filter the solution with a funnel filter, place filter paper on the filtered solution and wait.