Answer:
Mass is the amount of matter in an object.
Weight is how much an object weighs.
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The method which is appropriate for separating a mixture of iron and aluminum is A. using a magnet.
This is because aluminum does not have magnetic properties (thus it will be unaffected by the magnet), so it is easy to sort out all iron from the mixture using a magnet.
In addition to the elements enhancing structural rigidity, these latter compounds contain three new chiral centers.
