Chemistry Topic 10 Flashcards
(34 cards)
What are ceramics
Non metal solids with high melting points that aren’t made from carbon based compounds
What can some ceramic be made of
Clay
Glass
What are composites made of
One material embedded into another
What are thermosofteninf polymers
Contain individual polymer chains entwined together with weak forces between chains. You can melt these plastics and remould them
What are thermosetting polymers
Contain monomers that can form cross links between the polymer chains, holding the chains in a solid structure. They don’t soften when they’re heated
What is ceramics used for abs what are the properties
Ceramics include glass and clay. They’re insulators, brittle and stiff
What is polymers used for and what are the properties
Insulators, can be flexible, easily moulded. Can be used for clothing
What are properties of composites
Depend on matrix and reinforcement used to make them so they have many different uses
Properites of metals
Malleable, good conductor Of heat and electricity, ductile, shiny and stiff. They have many uses including electrical wires and cutlery
What are alloys
Adding another element to a metal
Why are alloys hard
Disrupts the structure of the metal makes it harder and the atoms sizes are different
Bronze=
Copper + tin
Brass=
Copper + zinc
Cold alloys=
Gold zinc silver copper
What is corrosion
Metals reacting with sum stances in the environment and are gradually destroyed
What happens to iron ONLY
It rusts not corrode
How can iron rust
It needs to in contact with BOTH oxygen and water
Why does aluminium objects corrode not destroy completely
Aluminium oxide forms when aluminium is exposed to oxygen this forms a protective layer that sticks to the aluminium and forms a barrier
How to know if a iron nail has rusted
The mass increases
What is one way of prevent rusting
Coat the iron
What can we cost iron with to prevent Rustin t
Painting electroplating and piling/greasing
How is electrolyte used to prevent rusting
Coat iron with different metal that won’t be corroded as it’s unreactive
What is a sacrificial method of preventing rusting and how does it work
Galvanising as it’s sprayed with zinc which is protective
What are finite resource
Aren’t formed quickly enough
