8G - Metals and Their Uses

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.

Which of the following best describes a catalyst?

• A catalyst is a reactant in a chemical reaction.
• A catalyst is produced in a chemical reaction.
• A catalyst speeds up a chemical reaction.
• A catalyst causes a different product to be made in a chemical reaction.

The product formed when calcium reacts with fluorine is …

• calcium fluoride
• fluorine calcide
• calcium chlorine
• calcium fluorate

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.

When scratched to remove its surface, which of the following metals will react most quickly with the air?

• aluminium
• copper
• lead
• tin

What must be present for iron to rust?

• water alone
• oxygen alone
• air alone
• water and oxygen

Painting stops iron rusting because the paint:

• is a catalyst for rusting.
• keeps out air and water.
• reacts with the air instead of iron.
• dries up any moisture in the environment.

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

• aluminium
• copper
• magnesium
• sodium

Complete the word equation:calcium + water ?

• calcium oxide + oxygen
• calcium sulfate + hydrogen
• calcium + oxygen
• calcium hydroxide + hydrogen