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4.2 Bonding, structure and the properties of matter

7 dot points across 7 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What are the three types of chemical bond, and when does each form?

The three types of chemical bond (ionic, covalent and metallic); when each forms based on the elements involved; the link between bonding and the particles transferred or shared.
A focused answer to AQA GCSE Chemistry 4.2.1, covering the three types of chemical bond, when ionic, covalent and metallic bonding occur, and how electrons are transferred or shared in each.
8 min answer →

How does covalent bonding work, and why do simple molecular and giant covalent substances differ?

Covalent bonding; shared pairs of electrons; small molecules; giant covalent structures such as diamond, graphite and silicon dioxide; and how structure explains properties.
A focused answer to AQA GCSE Chemistry 4.2.1 and 4.2.2, covering how covalent bonds form by sharing electrons, small molecules, polymers and giant covalent structures such as diamond, graphite and silicon dioxide, and how structure explains their properties.
9 min answer →

How does ionic bonding work, and why do ionic compounds have their properties?

Ionic bonding; the transfer of electrons to form ions; dot and cross diagrams; the giant ionic lattice; and how the structure explains melting points and conductivity.
A focused answer to AQA GCSE Chemistry 4.2.1, covering how ions form by electron transfer, drawing dot and cross diagrams, the giant ionic lattice, and how the structure explains the high melting points and conductivity of ionic compounds.
9 min answer →

How does metallic bonding explain the properties of metals and alloys?

Metallic bonding; positive ions in a sea of delocalised electrons; the properties of metals; why alloys are harder than pure metals.
A focused answer to AQA GCSE Chemistry 4.2.1 and 4.2.2, covering metallic bonding as positive ions in a sea of delocalised electrons, how this explains conductivity and malleability, and why alloys are harder than pure metals.
8 min answer →

What are nanoparticles, and why does their size make them so useful?

Nanoparticles; their sizes compared with atoms and bulk materials; surface area to volume ratio; uses; and the risks and considerations of nanotechnology.
A focused answer to AQA GCSE Chemistry 4.2.4, covering the size of nanoparticles, how surface area to volume ratio increases as particles get smaller, the uses of nanoparticles, and the risks and ethical considerations of nanotechnology.
8 min answer →

How does the particle model explain the three states of matter and changes of state?

The three states of matter; the particle model; changes of state; state symbols; and the limitations of the particle model.
A focused answer to AQA GCSE Chemistry 4.2.2, covering the three states of matter, the particle model, melting, boiling and the energy needed for changes of state, state symbols, and the limitations of the simple particle model.
8 min answer →

How does the structure of a substance explain its bulk properties?

Linking structure and bonding to properties; the four main structures; allotropes of carbon including graphene and fullerenes; and predicting properties from structure.
A focused answer to AQA GCSE Chemistry 4.2.2 and 4.2.3, linking the four main structures (ionic, simple molecular, giant covalent and metallic) to their properties, and covering the allotropes of carbon including graphene and fullerenes.
9 min answer →