Chemistry
Name the following:
(a) A metal which is liquid at room temperature.
(b) A metal which is always present in the amalgam.
(c) The process of heating an ore to a high temperature in the presence of air.
(d) The compound formed by the reaction between calcium oxide and silica.
(e) A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium
(f) Name an allotrope of a non-metal that allows electricity to pass through it.
Metallurgy
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Answer
(a) Mercury
(b) Mercury
(c) Roasting
(d) Slag i.e., Calcium silicate
CaO + SiO2 ⟶ CaSiO3 [Calcium silicate]
(e) Cryolite
(f) Graphite
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(a) State two properties of brass that render it more useful for some purposes than it's components.
(b) Name a metal which forms a liquid alloy at ordinary temperature.
Name the constituents of:
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(b) Solder
(c) Bronze
(d) Brass
Name the alloy used for the following purposes.
(a) Making electric circuits
(b) Making medals
(c) Making parts of watches
(d) Surgical instruments
(e) Aircraft
Using the information in the table below, complete the following :
(i) …………… is the metallic element.
(ii) Metal atoms tend to have a maximum of …………… electrons in the outermost energy level.
(iii) Non-metallic elements tend to form …………… oxides while metals tend to form …………… oxides.
(iv) Non-metallic elements tend to be …………… conductors of heat and electricity.
(v) Metals tend to …………… electrons and act as …………… agents in their reactions with elements and compounds.
X Y Normal electronic configuration 2, 8, 7 2, 8, 2 Nature of oxide Dissolves in water and turns blue litmus red Very low solubility in water. Dissolves in hydrochloric acid Tendency for oxidizing and reducing reactions Tends to oxidise elements and compounds Tends to act as a reducing agent Electrical and thermal conductivity Very poor electrical conductor and poor thermal conductivity Good electrical conductor and good thermal conductor Tendency to form alloys and amalgams No tendency to form alloys Forms alloys