GCSE_Unit 5D_Working with Polymers

What term correctly describes the separation of by-products from crude oil?

• Polymerisation

• Polymerisation

• Refining

• Fractional distillation

Which one of the following is a sustainable material?

• Bioplastic

• Gas

• Coal

• Oil

Which adhesive is best for glueing plastics together

• Solvent cement

• PVA

• Contact adhesive

• Epoxy resin

What two things are required to break down the large hydrocarbons to smaller, more useful molecules?

• Heat

• Gas

• Pressure

• Hydrogen

Select two distinctive features of thermoplastic molecules

• Long chains tangles together

• Lots of cross links

• No fixed pattern

• Long chains in straight lines

Thermoplastics have a degree of shape memory. State what is meant by ‘shape memory’ in this context?

• When they are reheated they try to return to their original shape (unless overheated or overstretched)

• When they are reheated they cannot return to their original shape (unless overheated or overstretched)

What distinctive features does a thermosetting molecular structure have?

• Crossed Linked

• More flexible structure

• permanently stiff molecular structure once set

• semi-permanent stiff molecular structure once set

Study the child carrier seat for bicycles shown below. Polypropylene has been used to make the product. Give 4 reasons for this choice.

Polypropylene is the material used to make the child carrier seat. Justify one additive that could be added to the polypropylene to enhance its properties

Molecules of ………………compounds known as monomers join together to form long chains of molecules called ……………….These atoms are joined end to end to form ………………

(a)