C4-6 Types of Materials

Which of these is NOT a type of material we have studied for this unit (C4)?

• ceramic

• alloys

• co-rodinates

• composites

How are ceramics made?

• by baking substances such as clay

• by embedding one material in another

• by mixing metals together

• by layers individual sheets of materials

Which TWO words describe ceramics?

• Brittle

• Opaque

• Stiff

• Alloys

What is a composite material?

• reinforced with fibreglass

• superimposed one inside another

• nanoparticle sized (10-9m)

• one material embedded in another

Complete the sentence:-

An alloy is a ... of a metal and at least one other element.

(a)  

Gold alloys are used to make jewellery. Metals such as zinc copper and silver are added to the gold. Why are they added?

• They harden the gold

• They make the gold more shiny

• They lower the density

• They are less reactive with water

Aluminium alloys are used the male aircraft. What is the reason aluminium alloys are used rather than pure aluminium?

• Aluminium is too light

• Aluminium is too soft

• Aluminium corrodes

• Aluminium is too reactive

Which of the following shows an alloy?

• 
• 
• 
• 

Stainless steel is an alloy of iron that does not rust.

Which two metals are added to iron to make stainless steel?

• carbon

• chromium

• nickel

• titanium

Steel is an alloy of iron and carbon.

Which of the following is NOT a reason steel is used instead of iron?

• steel is harder

• iron rusts

• the colour lasts longer

• steel is stronger