N4 Chemistry - Unit 3

Metals can be found on the Earth as __________ or as an ___.

Which two metals are found uncombined in the Earth?

• Gold

• Iron

• Silver

• Zinc

Fill in the blank: The most reactive metals are at the _ of the Reactivity Series.

• Bottom

• Top

• Middle

• End

The two main substance that cause metals to corrode are _____ and ______.

Which is a way of protecting metals from corrosion

• Leaving metal untreated in a dry place

• Only using water to wash metals

• Exposing to water

• Applying a protective coating

Painting and greasing are ________ methods of protecting against corrosion.

What is the purpose of painting, greasing or covering metals in plastic?

• To prevent corrosion

• To increase weight

• To make them better conductors

• To make them more flexible

Which of these describes galvanising?

• Covering iron in tin

• Covering iron in nickel

• Covering iron in zinc

• Attaching an electrode to iron

If a metal is used for cooking pots, what property will it have?

• Density

• Hardness

• Conductivity

• Malleable

Plastics are:

• Natural materials

• Synthetic materials

• Metals

• Minerals