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During science class, students combined 1 kg of iron filings with 1 kg of sand to create a mixture. Which of the following methods would be best for separating the iron filings from the sand?
A. Stir the mixture into hot water to dissolve the sand.
B. Strain the mixture through a paper filter to collect the sand.
C. Drag a magnet through the mixture to attract the iron filings.
D. Shake the mixture to cause the iron filings to settle to the bottom

Sagot :

indrawboy

Methods would be best for separating the iron filings from the sand : C. Drag a magnet through the mixture to attract the iron filings.

Further explanation

The mixture can be divided into a homogeneous mixture and heterogeneous mixture

The mixture of iron and sand are included in a heterogeneous mixture that is the suspension. The particle size is more than 100 nm.

A. Stir the mixture into hot water to dissolve the sand.

Sand will not dissolve in water, sediment will occur

B. Strain the mixture through a paper filter to collect the sand.

a paper filter is used to filter the solution, so it is expected that the sediment is held in the filter. If this paper filter is used, it will retain not only the sand but also the iron filings.

C. Drag a magnet through the mixture to attract the iron filings.

Magnets have the ability to attract metals like iron while sand is not metal

D. Shake the mixture to cause the iron filings to settle to the bottom

Shaking the mixture will make the density of the heavier compound settle to the bottom layer, due to the gravitational force, mainly used in solutions with water solvents, but iron fillings and sand have almost the same density so this method is not appropriate to separate the two

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