1. National 3 Chemistry Unit 3 Revision Chemistry in Society

2. Chemistry in Society 1 2 3 4 5 6 7 8 9 10 11 12

3. Low Density Conducts Electricity heat
Complete the table to show the property of the metal which makes it suitable for each use.
Choose your answer from the following.
conducts heat low density conducts electricity
Low
Density
Conducts
Electricity
heat

4. Ores What term is used to describe naturally occurring compounds of
metals?
Ores

5. Give two disadvantages in using a battery rather than mains electricity.
Batteries need replaced
Less power available
Batteries are hard to dispose of

6. What effect would rusting have on the strength of an iron bridge?
It would weaken

7. State one method that could be used to protect an iron bridge
State one method that could be used to protect an iron bridge from rusting.
Paint it or Galvanise

8. A 1. Which of the following contain only natural fibres?
A Cotton and silk
B Polyester and silk
C Cotton and nylon
D Polyester and nylon A

9. What is meant by a thermoplastic?
A plastic that can be reshaped when heated

10. D Uses of plastics are related to their properties.
Which line in the table shows a plastic that could be used for covering electrical wires?
Plastic
Property A
PVC
Flexible B
Kevlar
Very strong C
Perspex
Lets light through D
Formica
High melting point D

11. Which of the following properties is suitable for a plastic that is disposed of by burying?
A Light
B Thermoplastic
C Biodegradable
D Insoluble in water C

12. Name the polymer formed from ethene.
Poly(ethene)

13. The graph shows the mass of polythene used in a European country
Describe the general trend in the mass of polythene used between 2000 and 2006.
It increases

14. The plastic poly(chloroethene) has many uses.
Name the monomer used to make poly(chloroethene).
chloroethene