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GCSE AQA Chemistry Flashcards > C11 Polymers > Flashcards

C11 Polymers Flashcards

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1
Q

How can different forms of poly(ethene) be produced from ethene?

A

Different Reaction Conditions

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2
Q

Polyesters are produced when monomers join together and lose a small molecule.
Name the small molecule lost.

A

Water (H2O)

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3
Q

How are synthetic polymers made?

A

By using alkenes in Addition Polymerisation

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4
Q

What is the atom economy in Addition Polymerisation?

A

100%

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5
Q

What is addition polymerisation?

A

The joining of monomers to make polymers

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6
Q

What is a monomer?

A

A small molecule

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7
Q

What is a polymer?

A

Large molecules

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8
Q

Give two examples of polymers made by ethene.

A

Low Density Poly(ethene)
High Density Poly(ethene)

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9
Q

Why does HDPE have a high density?

A

The molecules are closely packed
There are no branches or side chains

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10
Q

What conditions are needed to make HDPE?

A

Catalyst
50°C
Slight Pressure

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11
Q

Why does LDPE have a low density?

A

Less dense
Had side chains and branches

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12
Q

What are the conditions needed to make LDPE?

A

Trace of oxygen
Moderate Temperature
Very high pressure

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13
Q

What are thermosoftening polymers?

A

Polymers that melt when they are heated

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14
Q

What are thermosetting polymers?

A

Polymers that don’t melt when they are heated

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15
Q

Why are thermosoftening polymers have low melting points?

A

They have individual chains that are entwined with each other with weak intermolecular forces holding the chains together. These are relatively easy to seperate.

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16
Q

Why don’t thermosetting polymers soften under heating?

A

It has a strong, rigid structure due to strong cross-links between monomers on different polymer chains which hold the structure.

17
Q

What are the uses of Poly(Ethene)?

A

Bags and bottles

18
Q

What are the uses of Poly(Chloroethene)?

A

Window Frames

19
Q

What are the uses of Poly(Phenylethene)?

A

Packaging Foam

20
Q

What are the uses of Poly(Propene)?

A

Crates
Ropes

21
Q

What are the uses of Poly(tetrafluoroethene)?

A

Frying Pan
Coating/Plumbers tape

22
Q

What are the uses of Poly(propenitrile)?

A

carpets & upholstery

GCSE AQA Chemistry Flashcards (15 decks)

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