Year 8 Mid-term 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 + water (

• calcium oxide + oxygen

• calcium sulfate + hydrogen

• calcium + oxygen

• calcium hydroxide + hydrogen