Question Bank - General Science

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Wires used for electrical connections are made of copper because copper is:

A.
ductile and a thermal conductor
B.
ductile and an electrical conductor
C.
malleable and a thermal conductor
D.
malleable and an electrical conductor

Solution:

The correct answer is ductile and an electrical conductor.Concept:Metals: Elements that have a tendency to lose electrons are called metals.Physical Properties of metals:State: Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature.Luster: Metals have the quality of reflecting light from their surface and can be polished e.g., gold, silver, and copper.Malleability: Metals have the ability to withstand hammering and can be made into thin sheets known as foils. Ductility: Metals can be drawn into wires.Conduction: Metals are good conductors because they have free electrons. Silver and copper are the two best conductors of heat and electricity. Density: Metals have high density and are very heavy. Iridium and osmium have the highest densities whereas lithium has the lowest density.Melting and Boiling Points: Metals have high melting and boiling points. Tungsten has the highest melting and boiling points whereas mercury has the lowest. Explanation:Copper is metal that can be drawn into wires and conduct electricity. Thus, it is used to make wires for electrical connections. Additional Information Physical properties of non-metals:State: They are solids or gases at room temperature with exception of Bromine which is a liquid.Dullness: They are dull and do not possess any kind of lustre.Malleability: They are non-malleable.Ductility: They are non-ductile.Conduction: They are bad conductors of heat and electricity. Density: They have low density.Melting and Boiling Points: They have low melting and boiling point.

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