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Question
during science class, while studying mixtures, you mix together iron filings and sand. your teacher challenges you to separate the sand from the iron filings. how could you use the physical properties of matter to best separate the two solids?
a add water to the mixture and dissolve the sand.
b pick out one of the two solids by using color to guide you.
c pour the mixture through a paper filter to separate the two.
d use a magnet to pull out the iron filings as they are attracted to a magnet.
La atracción magnética es una propiedad física específica de los materiales metálicos, como el hierro. Al usar un imán, se puede aprovechar esta propiedad para separar los escombros de hierro de la arena, ya que la arena no es magnética. Las otras opciones (A, B, C) no son efectivas: el agua no disuelve la arena (A), la clasificación visual por color no es práctica para mezclas finas (B) y el filtrado de papel no separa partículas sólidas de tamaño similar (C).
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D. Use a magnet to pull out the iron filings as they are attracted to a magnet.