(a) Name the main ore of mercury. How is mercury obtained from its ore? Give balanced chemical equation. (b) What is thermite reaction? How is it used to join the railway tracks or cracked machine parts? (c) Name the method used to extract metals of high reactivity.
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a) cinnabar is the main ore of mercury
HgS + O2 → Hg + SO2
HgS + Fe → Hg + FeS
4HgS + 4CaO → 4Hg + 3CaS + CaSO4
b) The thermite reaction. Demonstration. This demonstration shows the highly exothermic reaction between aluminium and iron(III) oxide that produces molten iron. This is a competition reaction, showing aluminium to be a more reactive metal than iron.
it is used as once molten iron solidifies it is very hard to break so it is used join and repair things
c) electrolysis
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Mercury is obtained from its sulphide ore called cinnabar, HgS which is actually mercury(ii) sulphide. 2. when this mercury oxide is heated at about 300 degrees Celsius , it decomposes to form mercury metal. Mercury is obtained from its sulphide ore called cinnabar, HgS which is actually mercury
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