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Year 9 DT > Imogen year 9 DT > Flashcards

Imogen year 9 DT Flashcards

1
Q

How does plastic start life?

A

As Plankton

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2
Q

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

A

Crude oil

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3
Q

Is crude oil infinite or finite?

A

finite (meaning it will eventually run out

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4
Q

What happens to crude oil in plastic manufacturing

A

If goes to a refinery which makes petrol diesel and naphtha

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5
Q

What kind of plastics melt?

A

thermoplastics

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6
Q

Can thermosetting plastics be remodelled (reshaped)

A

no

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7
Q

Do plastics need painting?

A

no they are self colouring

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8
Q

Is the melting point of plastics lower than most metals?

A

yes

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9
Q

What elements are in an ethylene molecule?

A

carbon and hydrogen

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10
Q

What does Poly - mer (polymer) mean?

A

poly = many mer = parts

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11
Q

What does monomer mean?

A

mono = one mer = part

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12
Q

What process takes place to turn monomer into a polymer

A

polymerisation

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13
Q

what temp does polymerisation take place at ?

A

800 degrees C

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14
Q

What happens when a thermosetting plastic is heated?

A

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

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15
Q

Are all plastics insulators?

A

yes

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16
Q

What kind of plastics are used in electric fittings? Why

A

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

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17
Q

Name some facts about thermoplastics

A

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

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18
Q

error card

A

error

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19
Q
A
20
Q
A
21
Q

Name some facts about thermosettingplastics

A
  • 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
22
Q
A
23
Q
A
24
Q

How are thermosetting plastic set hard?

A

By a chemical reaction

25
Q

Give a couple of uses of thermosettingplastics

A

pan handles and kitchen work benches (there are loads)

26
Q

Which are the most commonplastics used today?

give two reasons why

A

thermoplastics

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

27
Q

can thermoplastcics be ecycled?

A

yes

28
Q

as thermoplastics melt what happens to their strength?

A

They regain it

29
Q

Why do we put these symbols on plastic

A

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

30
Q

Why is plastic washed before it is recycled?

A

to remove impurities

31
Q

Why is plastic shredded before it is metled down?

A

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

32
Q

Define the term natural polymer?

(not the polymer bit)

A

a natural polymer exists in nature without man’s contribution

33
Q

Give 3 examples of natural polymers

A

bitumen

amber

rubber

34
Q

ive 3 examples of manmade polymers (there are loads )

A

acylic

polythene

nylon

35
Q

Give 5 methods of forming plastics

A
  1. injection moulding
  2. extrusion
  3. rotational moulding
  4. blow moulding
  5. vacuum forming
36
Q

What is this from ?

A

the top bits are guide bars and moving mould

37
Q

Can you descrbe injection moulding briefly?

A
  • 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
38
Q

FIll the gaps

A
39
Q
A
40
Q

Give 3 advantages of rotational moulding

A

cheap

quick

easy

41
Q
A
42
Q

can ytou descrbe the process of vacuum forming

A
43
Q
A
44
Q

Natural or manmade?

Bitumen

acylic

polythene

A

Natural

man-made

man-made

45
Q

Natural or man-made?

rubber

amber

nylon

A

natural

natural

man-made

46
Q

the end - woo hoo

A

:)

Year 9 DT (1 decks)

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