Using Materials
1. This question has 4 part(s).
1.1. PEX is a material made from poly(ethene) and is used as an alternative to copper for hot water pipes.
PEX is made from poly(ethene).
Suggest a property of PEX that makes it suitable for this use.
1.2. Poly(ethene) and PEX are shown in Figure 1.
Figure 1
Poly(ethene) is a thermoplastic that can be softened by heating.
Suggest and explain how the structure of PEX changes this property.
1.3. Banks store coins in low density poly(ethene) bags.
High density poly(ethene) can be made from the same monomer as the low density polymer.
Give one change to the same polymerisation reaction that can be used to produce two different products.
1.4. Reinforced concrete is a composite material used to make buildings. It consists of concrete strengthened with steel bars.
In this composite, what name is given to the:
Concrete
Steel bars
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