We made also another experiment. We took sand, marble hips and some iron. In order to separate iron we need a magnet and a small bag. Then we put the magnet into the bag and go over these chemicals. You can see that iron is magnetic and it is seperated from the two other chemicals.
We separate the sand from the marble chips by using a filter screen. Then we have all three chemicals separated which we mixed at the beginning of the experiment.
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