Chemistry: Using Resources Flashcards
what are ceramics
non-metal solids with high melting points that aren’t made from carbon based compounds
what are composites
substances made up of one material embedded in another
what do the properties of the composite depend on
the properties of the materials it is made up of
what two factors affect the properties of polymers
how it is made
what it is made up of
what are alloys
compounds made up of a metal and another material to give it other properties such as being stronger
what is the alloy bronze made from
copper and tin
what is the alloy brass made from
copper and zinc
what are gold alloys made from
gold and other metals
what are aluminium alloys made from
aluminium and other metals
what is corrosion
metals react with other substances in the environment and are gradually destroyed
what is rusting
the corrosion of ONLY iron
what two substances are needed for iron to rust
water and air
what are the four ways iron can be protected form rusting
painting/coating with plastic
electroplating
oiling/greasing
galvanisation
how does painting/coating iron with plastic protect against rusting
provides a protective outer layer
how does electroplating protect iron against rusting
uses electrolysis to reduce metal ions on an iron electrode
how does oiling/greasing protect iron against rusting
provides a protective layer and lubricates the object
how does galvanisation protect iron against rusting
sacrifices a more reactive metal such as zinc to react with air and water so that the iron doesn’t rust