metal and alloys

Which of the following is not a property of most metals?

• solid

• brittle

• strong

• malleable

Which of the following statements is true?

• Copper is used as a roof covering because it conducts heat well

• Copper is used as a roof covering because it changes to a green colour.

• Copper is used as a roof covering because it is malleable.

• Copper is used as a roof covering because it is a good conductor of electricity.

A copper coin is shiny when it is new, but will eventually go black and dull. The two words which best describe this process are:

• neutralisation and rusting.

• rusting and corrosion

• corrosion and oxidation.

• oxidation and neutralisation

Which of the following metals is so reactive it is stored under oil?

• aluminium

• copper

• magnesium

• sodium

What must be present for iron to rust?

• water and oxygen

• oxygen alone

• water alone

• air alone

What is missing from the symbol equation below.

2Na + 2 → 2NaOH + H2

• H2O

• H2

• HCl

• H2SO4

Which of these pictures shows the particles in a solid, pure metal?

• 
• 
• 
• 

A small amount of tin is added to lead. Compared to lead the melting point of the mixture will be

• unchanged

• lower and less precise

• higher and more precise

• higher and less precise