topic 10 - using resources (1. properties and uses of materials)

Question 1

what are the properties of ceramics

Question 2

what are the properties of ceramics

Answer 2

non metallic 
solids
high melting point
brittle 
excellent insulators

Question 3

types of ceramics

Answer 3

clay ceramics

glass

Question 4

what is clay ceramics

Answer 4

a soft material that can be moulded into different shapes which when fired at high temps it hardens to form clay

Question 5

what is clay ideal for

Answer 5

pottery and bricks

Question 6

properties of glass

Answer 6

transparent

moulded when hot and can be brittle when thin

Question 7

how is glass made (soda lime glass) made

Answer 7

heating a mixture of limestone sand sodium carbonate until melts when cools it produces glass

Question 8

what are composites made of

Answer 8

one material embedded in another

fibres or fragments of a material are surrounded by a matrix acting as a binder

Question 9

what is the difference between borosilicate glass and soda lime

Answer 9

borosilicate has a higher melting point but made in same way but with sand and boron trioxide

Question 10

examples of compositises

Answer 10

wood
fibre glass
carbon fibre
concrete

Question 11

properties of wood

Answer 11

cellulose fibres held together by ligim
versatile giving trees strength
valued building material

Question 12

properties of fibre glass

Answer 12

low density but very strong so used for things like skies

Question 13

what are polymers

Answer 13

large molecules formed when monomers join together held together by strong covalent bond

Question 14

what are properties of polymers

Answer 14

insulators of heat and electricty
flexible
easily moulded
properties mean have lots of applications including clothing

Question 15

what do the monomer a polymers made from determine

Answer 15

the type of forces between the chains

Question 16

what are thermosoftening polymers

Answer 16

individual tangled chains of polymers with weak forces between chains making them flexible

Question 17

what are thermosetting polymers

Answer 17

chains with crosslinks between meaning it doesn’t melt when heated it only chars
strong hard rigid

Question 18

how is a low denisty poly(ethene) made

Answer 18

by heating ethene to about 200 degrees under high pressure

flexible used for bags and bottles

Question 19

how is a high density poly(ethene) made

Answer 19

lower temp and pressure with a catalyst

rigid used for water tanks and drain pipes