4NA - Metals Flashcards
why are metals able to conduct electricity
contain sea of delocalised electrons
what is an alloy
mixture of metal and at least one other element
what are the main elements are contained in steel
iron and carbon
state one difference in the physical property of alloys and pure metals
alloys are harder and stronger
state the reactivity series of metals
potassium sodium calcium magnesium aluminium carbon zinc iron lead hydrogen copper silver gold
what is a displacement reaction
a more reactive metal can displace a less reactive metal from its compound
explain why a reaction occurs between magnesium and zinc chloride
magensium is more reactive than zinc
magnesium will displace zinc from zinc chloride
explain why no reaction occurs between copper and iron(II) sulfate
copper is less reactive than iron
copper cannot displace iron from iron(II) sulfate
state the method to extract calcium from its ores
electrolysis
[metals above carbon in the reactivity series can only be extracted by electrolysis]
state the preferred method to extract silver from its ores
reduction using carbon
[metals below carbon in the reactivity series can be extracted using reduction]
state the chemical formula of haematite
Fe2O3
what is the purpose of calcium carbonate (limestone) in the blast furnace
decompose to give calcium oxide to remove acidic SiO2
what are the waste gases coming out from the blast furnace
nitrogen, carbon dioxide, argon
give the chemical reaction for the extraction of iron from haematite
Fe2O3 + 3 CO –> 2 Fe + 3 CO2
give the chemical reaction for the formation of calcium silicate (slag)
CaO + SiO2 –> CaSiO3
