9.3. Alloys and their properties
A subsection of Chemistry, 5070, through 9. Metals
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Molybdenum, Mo, is a transition element. Suggest one physical property of molybdenum that is typical of a transition element. Suggest one chemical property of molybdenum compounds that is typical of compounds of transition elements. Molybdenum steel is an extremely hard alloy. Suggest, using ideas about metallic structure, why molybdenum steel is much harder than pure iron. A labelled diagram may help you answer this question. Molybdenum steel is made by reducing a mixture of MoO3 and Fe2O3 with aluminium. MoO3 + 2Al Mo + Al 2O3 Fe2O3 + 2Al 2Fe + Al 2O3 Molybdenum steel contains 20.0% by mass of molybdenum. Calculate the mass of MoO3 needed to make 1000 g of molybdenum steel. Give the answer to three significant figures. [The relative atomic mass of molybdenum, Mo, is 96.] mass of MoO3 g
5070_s19_qp_21
THEORY
2019
Paper 2, Variant 1
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