a) How will you show experimentally that metals are good conductors of heat.
b) Describe the extraction of Mercury metal from its ore Cinnabar (HgS).
Answers
a) A metal is a good conductor of electricity as well as heat. To experimentally show it, we can take a metallic rod and heat with fire on one side of the rod, gradually the other side of the rod starts get heating up, this is how the conductivity of the metals can be shown.
b) Mercury is extracted from its ore by heating the ore in a flow of air and then the mercury is condensed.
Answer:
Metals are a good conductor of heat.
ANS-(a)
This can be experimentally proved by the following activity:
Take a glass rod, a silver spoon and a plastic scale. Dip all three in a beaker containing boiling water. Leave the setup for 2-3 mins and touch each of the three, the glass rod, the silver spoon and the plastic scale. You would feel that only the silver spoon is hot.
Thus, it is proved that metals(in this case silver) are good conductors of heat.
ANS-(b)
Mercury is a less reactive metal and it can be extracted from its sulphide ore cinnabar by heating it in air alone. ... This converts mercury (II) sulphide to mercury (II) oxide. Mercury (II) oxide, so formed, is heated to around 300°C and it gets reduced to mercury metal.
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