Making cars

Question 1

what does rusting need?

Answer 1

oxygen
water
iron

Question 2

Describe oxidation

Answer 2

the addition of oxygen or the reaction of a substance with oxygen

Question 3

Compare the properties of iron and aluminium:

Answer 3

• iron is more dense than aluminium
• iron is magnetic and aluminium is not
• iron corrodes (rusts) easily and aluminium does not
• iron and aluminium are both malleable
• iron and aluminium are both good electrical
conductors.

Question 4

Recall the major materials needed to build a car

Answer 4

• steel, copper and aluminium

* glass, plastics and fibres

Question 5

Describe the advantages of recycling materials

Answer 5

• saves natural resources

* reduces disposal problems

Question 6

Understand how salt water and acid rain affect

rusting

Answer 6

they both increase the rate of rusting

Question 7

what type of reaction is rusting?

Answer 7

oxidation (iron reacts with oxygen forming an oxide)

Question 8

Construct the word equation for rusting

Answer 8

iron + oxygen + water → hydrated iron(III) oxide

Question 9

Explain why aluminium does not corrode in moist

conditions

Answer 9

it is protected by a smooth coating of aluminium oxide

Question 10

Explain advantages and disadvantages of building

car bodies from aluminium or from steel

Answer 10

• get better fuel economy because the car body of
the same car will be lighter with aluminium
• longer lifetime because the car body with
aluminium will corrode less

Question 11

Describe advantages and disadvantages of building

car bodies from aluminium or from steel

Answer 11

• car body of the same car will be lighter with
aluminium
• car body with aluminium will corrode less
• car body of the same car will be more expensive
made from aluminium

Question 12

Explain the advantages and disadvantages of

recycling the materials used to make cars

Answer 12

+ less material to dispose of
+ less energy needed to recycle than to extract from raw materials
+ limited natural resources will last longer
- different materials have to be separated

Question 13

Explain why new laws specify that a minimum
percentage of all materials used to manufacture cars
must be recyclable

Answer 13

from 2015 95% of a car must be able to be recycled. Recycling reduces the amount of waste, and the use of natural resources

Question 14

Understand that alloys often have properties that are
different from the metals they are made from and that
these properties may make the alloy more useful than
the pure metal

Answer 14

• steel is harder and stronger than iron

* steel is less likely to corrode than iron.