L08. Making Polymers

1. Connector: Complete the table on the next slide about alkenes (Grade D) L08. Making Polymers

2. Alkenes No. ofcarbon atoms Molecularformula Name 2 3 4 5 6 C2H4 ethene C3H6 propene C4H8 butene C5H10 pentene C6H12 hexene

3. 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)

4. 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.

5. Task 1 (Grade C) • Keywords for Task 1: • Task 1: • Write down one thing you know about each of the key words below: monomer, polymer, polymerisation, alkene • Task 1: Extension

6. What are polymers? Polymers are very large molecules made when hundreds of monomers join together to form long chains. The word ‘polymer’ comes from the Greek words poly (meaning ‘many’) and meros (meaning ‘parts’). Plastics are synthetic polymers that can be shaped by heat or pressure.

7. covalent bond What keeps the chain together? 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.

8. Task 1: Review Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

9. New Information for Task 2 • Watch presentation 002 and the animation 001: • Think about what are polymers and how are they formed.

10. How is polyethene made?

11. double covalentbond What are polymers made from? 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. • The simplest alkene is ethene (C2H4). • The second simplest alkene is propene (C3H6).

12. addition polymerization  polymer 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. monomers

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

14. Task 2 (Grade B) • Task 2: Monomers • 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:

15.  polypropene Task 2: Answers polyvinylchloride (PVC)?   polythene

16. Task 2: Review Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

17. New Information for Task 3 • Watch the demonstration on making nylon

18. 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:

19. Task 3: Answers

20. Task 3: Review Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

21. Keywords: • Additional polymerisation • Monomer • Polymer • Polymerisation Put your hand up if there is any key word that you don’t know the meaning of.

22. Review of lesson • Watch interactive 001 • Match the monomers to their polymers.

23. Homework • Homework task: • Due date: • Criteria for Grade C: • Criteria for Grade B: • Criteria for Grade A/A*:

24. Technicians’ List