1. DTT Booster EDEXCEL CORE Science C1
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DTT Booster
EDEXCEL CORE Science C1
THERAPY Topic 2 – Polymerisation and Polymers 
Commissioned by The PiXL Club Ltd. February 2016
© Copyright The PiXL Club Ltd, 2016
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
The PiXL Club Ltd, Company number

2. How to deliver the DTT Booster
Administer the short diagnosis test.
Mark the test (peer assess)
Work through the therapy slides completing the model questions and answers.
Complete the question slides for students to self assess.
Administer the final test (peer assess)

3. Conduction and convection
Polymerisation and Polymers 
Model Question: Draw the structure that this monomer will make.
Model Answer
Alkenes can be used to make polymers such as poly(ethene) and poly(propene). In these reactions, many small alkane molecules (monomers) join together to form very large molecules (polymers). This happens at very high pressure and temperature.
If you join many propene molecules you get poly(propene). If you join many styrene molecules you get poly (styrene).
CLICK to reveal MODEL ANSWER
TESTING FOR ALKENES: You can use bromine water to work out if you have an alkene. Bromine water is brown. Alkenes make it colourless. Alkanes do not change the colour.
P1.1.3a/P1.1.1

4. CLICK to reveal MODEL ANSWER
Polymerisation and Polymers   
Model Question:
Why are polymers more useful than the monomers they are made from?
Model Answer
They have different properties than the monomers.
The long chains make them useful for making many different plastics.
Polymer
Typical use
Poly(ethane)
plastic bags and bottles
Poly(propene)
crates and ropes
Poly(chloroethene)
PVC
water pipes and insulation on electricity cables
CLICK to reveal MODEL ANSWER
Biodegradable Plastics: Plastics that break down easily. Corn-starch are built into the plastic. Microorganisms in soil feed on corn-starch. This breaks the plastic down.
Issues with polymers:
Biodegradable - Farmers sell crops like corn to make plastics, less land available for food production, demand for food goes up, food prices go up, Non – biodegradable - Don’t break down, litter, harm wildlife on land and in the oceans, last 100’s of years, fill up landfill sites. They use up finite non- renewable resources.

5. Polymerisation and Polymers - Questions
1. Draw a diagram representing the process of polymerisation of ethene. Label the following: Monomer Polymer Ethene Poly(ethene) 2. Describe the process of polymerisation. 3. What conditions are needed for polymerisation to occur? 4. What is poly(ethene) used for? 5. What is PVC used for? 6. Why is it important to recycle polymers? 7. What are biodegradable plastics? 8. What test is used to determine if a chemical is an alkene?

6. Polymerisation and Polymers - Answers
1. Draw a diagram representing the process of polymerisation of ethene. Label the following:
3. What conditions are needed for polymerisation to occur? High temperature and high pressure.
4. What is poly(ethene) used for? Making plastic bags, food containers and bottles.
5. What is PVC used for? Window frames, water pipes and electrical insulation for cables.
6. Why is it important to recycle polymers? They are mainly made from non-renewable sources and do not break down for a very long time.
7. What are biodegradable plastics? Plastics that breakdown easily in nature.
8. What test is used to determine if a chemical is an alkene? Bromine water if it goes clear then the chemical is an alkene.

7. Final test DTT Booster
Students now complete the final test (peer assess).
Compare this to what they achieved in the diagnostic test.