Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful?

How manyatoms of mercury are in 1.4214e+1 ml sample

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

‘which reaction would most likely require the use of an inert electrode?