C2 Properties of materials LO To know how to describe materials and to introduce polymers

# C2 Properties of materials LO To know how to describe materials and to introduce polymers

## C2 Properties of materials LO To know how to describe materials and to introduce polymers

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1. C2 Properties of materialsLO To know how to describe materials and to introduce polymers How many reasons can you suggest for why we don’t make teapots out of chocolate

2. What is this module about?

3. Copy these words and try to write a definition for them. Strong Soft Heavy Flexible Brittle What are their opposites??

4. Thinkboard:Outcomes – create a thinkboard that explains the different properties of materials - work independently Use the hand-out to help you! EXTENSION: create a key word wordsearch using some squared paper

5. copy and complete Word bank Force difficult Newtons apart Bend Soft Break Heavy Stretch light Scratch The strength of a material is the f……… needed to b………… it. Strength is the force needed to pull an object a……Force is measured in …….. Stiffness is a measure of how d……… they are to b……… or s…………… If a material is s…………… it is easy to s……………. The density of a material tells you how h………… or l……… it is.

6. copy and complete Word bank Force difficult Newtons apart Bend Soft Break Heavy Stretch light Scratch The strength of a material is the f……… needed to b………… it. Strength is the force needed to pull an object a……Force is measured in …….. Stiffness is a measure of how d……… they are to b……… or s…………… If a material is s…………… it is easy to s……………. The density of a material tells you how h………… or l……… it is.

7. We will find out about …………. • The testing and measurementthat helps people make choices when buying products • Some of theexplanationsscientists use to design better materials • Ways toweigh upthe costs and benefits of using different materials • Thechoicespeople can make to reduce waste.

8. Materials by design • LO: To know the difference between natural and man made materials and how the properties are important Mix and match Hard Tough Strong Stiff The opposite of brittle A lot of pressure needed to break it Not easy to scratch The opposite of flexible

9. Polymers Polymers are long molecules made up of chains of repeating units. There are natural and synthetic polymers e.g. cellulose (used in plants) and PVC used for dodgy trousers

10. A polythene bag. Why do we wrap our food?

11. A new leg made of polypropylene. In what ways can polymers meet our need for health care?

12. Why preach in an inflatable church made of PVC?

13. A boat with polyester sails and a reinforced plastic hull. Why sail in a boat like this?

14. A painting in a shop in Zanzibar. The paint is acrylic. Why do people buy pictures like this?

15. Why does this farmworker need to wear a polycarbonate face mask and synthetic rubber gloves?

16. Kevlar is the polymer in army helmets and bulletproof clothing. What makes Kevlar so vital?

17. Why does this diver choose to wear a wetsuit? The suit is made of a synthetic rubber, neoprene.

18. Polymers Polymers are long molecules made up of chains of repeating units. There are natural and synthetic polymers e.g. cellulose (used in plants) and PVC used for dodgy trousers

19. What type of polymers do you know? Man made POLYMERS neoprene PET -polyester Kevlar

20. What type of polymers do you know? NATURAL POLYMERS Wood Cotton DNA

21. OUTCOMES – Powerpoint on materials. • Split into sections – man made polymers vs natural polymers In each section research the -structure -making of -uses Natural Polymer Man-made Polymer Cotton Neoprene DNA PET - polyester Wood Kevlar

22. Using pg 112 complete this table

23. Materials by design • LO: To know the difference between natural and man made materials and how the properties are important Mix and match Hard Tough Strong Stiff The opposite of brittle A lot of pressure needed to break it Not easy to scratch The opposite of flexible

24. Natural or syntheticLO: To know where our clothes come from • Starter • Name a material that is natural (comes straight from the earth’s resources) • Name a material that humans have to make • What is the advantage of being able to make our own materials?

25. Polymers Polymers are long molecules made up of chains of repeating units. There are natural and synthetic polymers e.g. cellulose (used in plants) and PVC used for dodgy trousers

26. What type of polymers do you know? Man made POLYMERS neoprene PET -polyester Kevlar

27. What type of polymers do you know? NATURAL POLYMERS Wood Cotton DNA

28. OUTCOMES – Powerpoint on materials. • Split into sections – man made polymers vs natural polymers In each section research the -structure -making of -uses Natural Polymer Man-made Polymer Cotton Neoprene DNA PET - polyester Wood Kevlar

29. Polymers Polymers are long molecules made up of chains of repeating units. There are natural and synthetic polymers e.g. cellulose (used in plants) and PVC used for dodgy trousers

30. A polythene bag. Why do we wrap our food?

31. A new leg made of polypropylene. In what ways can polymers meet our need for health care?

32. Why preach in an inflatable church made of PVC?

33. Quick recap: • Name a material that is natural (comes straight from the earth’s resources) • Name a material that humans have to make • What is the advantage of being able to make our own materials?

34. Natural or syntheticLO: To know where our clothes come from • Starter • Name a material that is natural (comes straight from the earth’s resources) • Name a material that humans have to make • What is the advantage of being able to make our own materials?

35. Natural or syntheticLO: To know where our clothes come from Mix and match Hard Tough Strong Stiff The opposite of brittle A lot of pressure needed to break it Not easy to scratch The opposite of flexible

36. What is the process of making a polymer called? POLYMERISATION nanometres

37. Once we have a polymer we can CHANGE it • Chain length – long and stiff vs. short and soft • Cross links = stiffer and stronger • Plasticisers = flexible and soft

38. Polymers Pick two ways from below to show how we might make a polymer softer/weaker Make short chains Make really long chains Add side branches Add cross links Make sure there are no side branches Add a plasterciser