L08. Making Polymers

Lesson OutcomesAPP AF4

HSW 1c,2c,3a,3c

How I did Targets

Task 1: Describe the relationship between a monomer and its polymer

Grade C

Task 2: Describe how polymerisation works

Grade B

Task 3: Construct displayed formulae of monomers and polymers

Grade A/A*

Connector:

Complete the table on the next slide about alkenes

(Grade D)

Alkenes

C6H12 hexene

C5H10 pentene

C4H8 butene

C3H6 propene

C2H4 ethene

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5

4

3

2

NameNo. ofcarbon atoms

Molecularformula

BIG picture

• What skills will you be developing this lesson?

• ICT• Numeracy• Literacy• Team work• Self management• Creative thinking• Independent enquiry • Participation• Reflection

• How is this lesson relevant to every day life? (WRL/CIT)

New Information for Task 1

• Watch presentation 001 on the next slide.• Now write down what they all have in common.• Write down how are these materials are made?

• Share your answer with a partner.

• Pairs feed back one of their answers to the rest of the class, ‘passing’ if their answer has already been given.

Task 1 (Grade C)

• Task 1:• Write down one thing you know

about each of the key words below:

monomer, polymer, polymerisation, alkene

• Task 1: Extension

Keywords for Task 1:

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The word ‘polymer’ comes from the Greek words poly (meaning ‘many’) and meros (meaning ‘parts’).

Polymers are very large molecules made when hundreds of monomers join together to form long chains.

Plastics are synthetic polymers that can be shaped by heat or pressure.

What are polymers?

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The monomers in a polymer are joined together by covalent bonds between atoms.

In a covalent bond, each atom shares one or more electron with another atom. The bonds are sometimes shown as sticks.

What keeps the chain together?

covalent bond

Task 1: Review

Lesson Outcomes How I did Targets

Task 1:

Grade C

Met?

Partly met?

Not met?

How can I improve on task 1?

Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

New Information for Task 2

• Watch presentation 002 and the animation 001:

• Think about what are polymers and how are they formed.

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How is polyethene made?

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Many polymers are formed from alkenes, which are a family of hydrocarbon molecules with the general formula CnH2n.

Alkenes contain at least one double covalent bond between carbon atoms. The double bond makes them very reactive.

What are polymers made from?

The simplest alkene is ethene (C2H4).

The second simplest alkene is propene (C3H6).

double covalent

bond

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Addition polymerization

Polyethene (sometimes called polythene) is a polymer made from ethene.

The process by which polyethene and other polymers is made is called addition polymerization. This is because many monomers (ethene molecules) are added together.

addition polymerizationmonomers

polymer

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Drawing polymers – shorthand formulae

Polymers contain thousands of molecules, so how can their structures be easily drawn?

Part of the polymer molecule can be drawn:

A better way is to show a shorthand formula:

The ‘n’ means that the polymer contains a very large number of the repeating unit shown in the brackets.

Task 2 (Grade B)

• Task 2: Explain what polymer are and how they are formed

• Task 2: Extension: Draw the following polymers from the monomers on the right hand side:

Task 2: Monomers

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Task 2: Answers

polypropene

polyvinylchloride (PVC)?

polythene

Task 2: Review

Lesson Outcomes How I did Targets

Task 2:

Grade B

Met?

Partly met?

Not met?

How can I improve on task 2?

Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

New Information for Task 3

• Watch the demonstration on making nylon

Task 3: (Grade A/A*)

• Task 3: • Carry out the practical on

making slime and complete the activity sheet 1.8

• Task 3: Extension

Keywords for Task 3:

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Task 3: Answers

Task 3: Review

Lesson Outcomes How I did Targets

Task 3:

Grade A/A*

Met?

Partly met?

Not met?

How can I improve on task 3?

Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

Keywords:

Put your hand up if there is any key word that you don’t know the meaning of.

• Additional polymerisation• Monomer• Polymer• Polymerisation

Review of lesson

• Watch interactive 001

• Match the monomers to their polymers.

Homework

• Homework task:

• Due date:

• Criteria for Grade C:

• Criteria for Grade B:

• Criteria for Grade A/A*:

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