Properties of metals and alloys

In which row are the elements placed in the correct order of their chemical reactivity, starting with the most reactive element?

• A

• B

• C

• D

Which structure represents that of an alloy?

• A

• B

• C

• D

Which two elements are the major constituents of brass?

• Br and As

• Cu and Sn

• Cu and Zn

• Sn and Zn

The diagram shows the structure of brass. Why is brass harder than pure copper?

• The zinc atoms form strong covalent bonds with copper atoms.

• The zinc atoms prevent layers of copper atoms from slipping over each other easily.

• The zinc atoms prevent the ‘sea of electrons’ from moving freely in the solid.

• Zinc atoms have more electrons than copper atoms.

Which statement is correct for all metals?

• They are hard and brittle.

• They are made up of a lattice of positive and negative ions.

• They conduct electricity by movement of electrons.

• They conduct electricity by movement of ions.

Which set of the electronic structures are only found in metals?

• 2,1

  2,8,1

  2,8,8,1

• 2,5

  2,6

  2,7

• 2,7

  2,8,7

  2,8,18,7

• 2,8,3

  2,8,4

  2,8,5

Which statement explains why aluminium is malleable?

• Aluminium has layers of cations that can slide over one another.

• Aluminium has layers of electrons that can slide over one another.

• Aluminium has weak bonds between protons and a ‘sea of electrons’.

• Aluminium is covered with a layer of unreactive aluminium oxide.

Bronze is an alloy.

Which statement about bronze is correct?

• It contains a sea of electrons.

• It contains positive and negative ions which are free to move.

• It is a compound of metal and non-metal.

• It is a compound of two or more metals.