1.3 Structures
Simple molecular, giant ionic, giant covalent and metallic structures, intermolecular forces and structure-property explanations.
How to study for CCEA GCSE Chemistry
Connect particle models to observations, balance every quantitative relationship, and prepare each prescribed practical from safe method through analysis and evaluation.
Core concepts
Concept 1
Melting, boiling, conductivity, hardness and solubility follow from particle arrangement, bonding and mobility.
Exam cue: Name the structure before explaining a physical property.
Concept 2
Simple molecular substances have strong covalent bonds within molecules but weaker attractions between molecules.
Exam cue: State which force or bond is overcome during a change of state.
Concept 3
Giant structures extend throughout a lattice, so their properties depend on the bonding and whether ions or electrons can move.
Exam cue: For conductivity, identify the charged particle and whether it is mobile in the stated condition.
Risk pitfalls and guardrails
Saying covalent bonds break whenever a simple molecular substance melts.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a particle-level explanation with a vague observation.
Claiming solid ionic compounds conduct because they contain charged ions.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a particle-level explanation with a vague observation.
Using 'strong molecules' without identifying bonds or intermolecular attractions.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a particle-level explanation with a vague observation.
Memory anchors
Simple molecular
Discrete covalent molecules with relatively weak forces between them.
Giant ionic
A repeating lattice of oppositely charged ions.
Giant covalent
A network of atoms connected by many covalent bonds.
Metallic bonding
Attraction between positive metal ions and delocalised electrons.
Molten ionic conductor
Ions become mobile and can carry charge.
Graphite conductivity
Delocalised electrons move through its layered giant structure.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Why does sodium chloride have a high melting point?
A conductivity test gives no current through solid sodium chloride. Which lattice property explains the result?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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