Chapter 27: Plastics

All the following "answers" are for your reference only!

The "best" answers are based on your actual experimental results!

 

Experiment 27.1: Testing the strength and ease of softening of articles made of plastics

Name of plastic	Type of plastic	Strength
Polyethene	Thermoplastics	Softened on heating, hardened on cooling
Polyvinyl chloride	Thermoplastics	Softened on heating, hardened on cooling
Polystyrene	Thermoplastics	Softened on heating, hardened on cooling
Perspex	Thermoplastics	Softened on heating, hardened on cooling
Nylon	Thermoplastics	Softened on heating, hardened on cooling
Urea-methanal	Thermosetting Plastics	Cannot be softened

 

11. Refer to C27 P.3-4

Experiment 27.2: Preparation of polystyrene

4.   As a solvent and catalyst.

5.   A white wax-like solid is formed.

7.   It hardens.

9.   a)  White.

b)  Soft.

c)   Flexible.

11. To decrease the solubility of polystyrene.

 

Experiment 27.3: Making nylon

3.   A white skin is formed.

11. a)  White.

b)  Soft and flexible.