AQA revision bonding & nanotechnology

Which statement describes the structure of copper?

• It has a lattice of negative ions in a ‘sea of electrons’.

• It has a lattice of negative ions in a ‘sea of protons’.

• It has a lattice of positive ions in a ‘sea of electrons’.

• It has a lattice of positive ions in a ‘sea of protons’

The structure of copper is described as a lattice of positive ions in a ‘sea of electrons’.

Which statements are correct?

• Copper has a high melting point because of the strong electrostatic attraction between the positive ions and the ‘sea of electrons’.

• Copper is malleable because the layers of atoms in the lattice can slide over each other.

• Copper atoms can be oxidised to form copper ions by losing electrons.

Which statement about metals is correct?

• Layers of positive ions can slide over each other making metals malleable.

• Metallic bonding consists of a lattice of negative ions in a sea of delocalised electrons.

• Metallic bonding consists of a lattice of positive ions in a sea of delocalised negative ions.

• Metals conduct electricity because positive ions are free to move.

Which name is given to mixtures of metals?

• Alloys

• Compounds

• Ores

• Salts

Which diagram represents an alloy?

• A

• B

• C

• D

Each Carbon atom is bonded to 4 other carbon atoms

• Diamond

• Graphite

• Both

Has layers of sheets of carbon held together by weak forces of attraction

• Diamond

• Graphite

• Both

Is it the hardest natural substance known

• Diamond

• Graphite

• Both

Won't conduct electricity (it is an electrical insulator)

• Diamond

• Graphite

• Both

A soft material, due to slippery layers

• Diamond

• Graphite

• Both