Sarah and Maria mixed some iron filings with yellow sulfur powder. Both iron and sulfur are elements in the periodic table. The girls used a magnet to separate the iron filings from the sulphur. Next, the girls poured the two elements in a test tube and heated the mixture in a flame. The two elements melted and black smoke came out of the test tube. The two liquids seemed to combine. When the girls stopped heating the test tube, there was a shiny black solid inside. The took a magnet and held it up to the new substance but nothing happened. Why? A) The heat demagnetized the iron filings. B) Solid iron compounds are never magnetic. C) The solid, iron sulfide, had new properties. D) The girls just needed to use a stronger magnet.
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