Transition Metals, Alloys And Corrosion 2.0 Flashcards
why does aluminium not react with water?
Its surface is protected by a natural layer of aluminium oxide that allows the metal to resist corrosion
why is aluminium foil used in the home for wrapping and storing food?
-it does not react to substances in food.
-It is malleable, so it is easily folded into shape around the food.
what is the density of aluminium like? and what does this make the aluminium pieces?
-low density,
-relatively lightweight.
explain why magnalium is used to make aircraft parts?
Magnalium is stronger than aluminium alone but still has a low density.
Suggest an explanation for why aluminium is used to make overhead electricity cables.
-Aluminium is a good electrical conductor.
-Its low density prevents the wires from sagging too much or breaking under their own weight.
what is a notable property of copper and brass?
resist corrosion and are good electrical conductors.
why is copper used in electrical wiring and why is brass used in electrical plugs?
Copper is a better conductor than brass.
Brass is stronger than copper
what are the notable properties of gold? (3)
very soft and malleable
unreactive, so it resists corrosion and stays shiny.
alloyed with other metals, often copper. makes the jewellery much stronger while keeping its ability to stay shiny.
why does gold never lose its shine?
It is also very unreactive, so it resists corrosion and stays shiny.
why is gold jewellery often alloyed with other metals?
This makes the jewellery much stronger while keeping its ability to stay shiny.
Suggest an explanation for why thin gold foil is used to decorate picture frames.
Gold stays shiny and resist corrosion since it is very unreactive
+it has an attractive appearance.
what is the composition of Magnalium?
Aluminium and magnesium
what is the composition of Brass ?
Copper and zinc
what is the composition of Jewellery gold ?
Gold and copper
