Imogen year 9 DT

Question 1

How does plastic start life?

Answer 1

As Plankton

Question 2

In the making of plastics - over millions of years plankton turns into …..?

Answer 2

Crude oil

Question 3

Is crude oil infinite or finite?

Answer 3

finite (meaning it will eventually run out

Question 4

What happens to crude oil in plastic manufacturing

Answer 4

If goes to a refinery which makes petrol diesel and naphtha

Question 5

What kind of plastics melt?

Answer 5

thermoplastics

Question 6

Can thermosetting plastics be remodelled (reshaped)

Answer 6

no

Question 7

Do plastics need painting?

Answer 7

no they are self colouring

Question 8

Is the melting point of plastics lower than most metals?

Answer 8

yes

Question 9

What elements are in an ethylene molecule?

Answer 9

carbon and hydrogen

Question 10

What does Poly - mer (polymer) mean?

Answer 10

poly = many mer = parts

Question 11

What does monomer mean?

Answer 11

mono = one mer = part

Question 12

What process takes place to turn monomer into a polymer

Answer 12

polymerisation

Question 13

what temp does polymerisation take place at ?

Answer 13

800 degrees C

Question 14

What happens when a thermosetting plastic is heated?

Answer 14

additional crosslinks connecting the polymer chains prevent the molecules from moving over each other .

Question 15

Are all plastics insulators?

Answer 15

yes

Question 16

What kind of plastics are used in electric fittings? Why

Answer 16

thermosetting If they were heated the electrical terminals could melt and move - making a short circuit causing a fire

Question 17

Name some facts about thermoplastics

Answer 17

Made of long polymer chains with few cross links Recyclable Can be reheated and reshaped Soften when heated Extreme heat turns it to liquid

Question 18

error card

Answer 18

error

Question 19

Answer 19

Question 20

Answer 20

Question 21

Name some facts about thermosettingplastics

Answer 21

• Initially set by heat caused by a chemical reaction
• string
• durable
• cannot be reshaped when set
• Consist of polymer chains with many cross links between chains

Question 22

Answer 22

Question 23

Answer 23

Question 24

How are thermosetting plastic set hard?

Answer 24

By a chemical reaction

Question 25

Give a couple of uses of thermosettingplastics

Answer 25

pan handles and kitchen work benches (there are loads)

Question 26

Which are the most commonplastics used today? give two reasons why

Answer 26

thermoplastics Can be reshaped using heat - allows a large range of products

Question 27

can thermoplastcics be ecycled?

Answer 27

yes

Question 28

as thermoplastics melt what happens to their strength?

Answer 28

They regain it

Question 29

Why do we put these symbols on plastic

Answer 29

So that we can tell which plastic they are made from in roder to recycle it completely

Question 30

Why is plastic washed before it is recycled?

Answer 30

to remove impurities

Question 31

Why is plastic shredded before it is metled down?

Answer 31

to increase the surface area so t melts more quickly and evenly

Question 32

# Define the term natural polymer? (not the polymer bit)

Answer 32

a natural polymer exists in nature without man's contribution

Question 33

Give 3 examples of natural polymers

Answer 33

bitumen amber rubber

Question 34

ive 3 examples of manmade polymers (there are loads )

Answer 34

acylic polythene nylon

Question 35

Give 5 methods of forming plastics

Answer 35

1. injection moulding 2. extrusion 3. rotational moulding 4. blow moulding 5. vacuum forming

Question 36

What is this from ?

Answer 36

the top bits are guide bars and moving mould

Question 37

Can you descrbe injection moulding briefly?

Answer 37

* plastic powder granules are fed intot the hopper which store it until needed * Heaterheats up the tube and whenhigh temp - the screw starts turning * motor turn thred , pushing the granules along heater section which milts the grnaules - liquid is forced into the mould * moving mould moves awa from fixed mould and product removed

Question 38

FIll the gaps

Answer 38

Question 39

Answer 39

Question 40

Give 3 advantages of rotational moulding

Answer 40

cheap quick easy

Question 41

Answer 41

Question 42

can ytou descrbe the process of vacuum forming

Answer 42

Question 43

Answer 43

Question 44

Natural or manmade? Bitumen acylic polythene

Answer 44

Natural man-made man-made

Question 45

Natural or man-made? rubber amber nylon

Answer 45

natural natural man-made

Question 46

the end - woo hoo

Answer 46

:)