Metals and physical properties Flashcards
Introduction of metals and their physical properties. [VERY SA questions ]
why are metals said to be malleable ?
Metals can be beaten in thin sheets with hammer.
Why are metals called electropositive elements?
Because Metals can lose electrons to form positive ions.
What is the most ductile metal on the earth ?
Gold.
why are non metals called electronegative ions ?
Because they can gain electrons to form negative ions.
Which is the best conductor of electricity
Silver
Which is the worst conductor of heat?
Lead [Pb]
Why is silver used in making mirrors?
because it is a good reflector of light.
Why is PVC used in covering wires ?
because it is an insulator of electricity
which metals are used in making utensils and why ?
Copper and aluminum because of thermal conductivity.
which metals are soft metals ?
potassium and sodium.
why are silver and gold used in decorating sweets
because of their malleabilility.
which metal is used for making bulb wires?
tungsten
which metal which metal is a liquid at room temperature?
mercury
which metals have very low densities ?
sodium and potassium
why is iron used for makin g bridges ?
because they can hold large weights without snapping.
