how to Prepare a project report on various samples of a) a mixture, b) a compound, c) an element (metal and nonmetal), (3 of each category) highlighting the main characteristics.? 

Dear student, 
Here are few tips which you can follow:
-First write the sample name for eg. Mixture
- After this write the definition of mixture. Give few examples. 
- Then write the categories if it exists for eg. mixture are of two types homogenous and heterogeneous. Explain each type and give examples. 
- Next write the characteristics of mixture. 
You can follow the same outline for other samples as well. 
Hope this helps!! 
Regards

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