Bonding & Substance Properties (AQA GCSE Chemistry Combined Science): Flashcards
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Giant covalent structures definition
Giant covalent structures definition
Huge networks of atoms bonded by covalent bonds
Examples of giant covalent structures
Examples of giant covalent structures
Diamond, graphite, silicon dioxide (silica)
Melting & boiling points: giant covalent structures
Melting & boiling points: giant covalent structures
Very high
Why giant covalent structures have high melting points
Why giant covalent structures have high melting points
Strong covalent bonds need lots of energy to break
Electrical conductivity of giant covalent structures
Electrical conductivity of giant covalent structures
Most don't conduct (except graphite)
Why giant covalent structures don't conduct electricity
Why giant covalent structures don't conduct electricity
No free-moving charged particles
Arrangement of carbon atoms in graphite
Arrangement of carbon atoms in graphite
Layers of hexagons
Why graphite layers slide over each other
Why graphite layers slide over each other
Held together by weak forces
Physical texture of graphite
Physical texture of graphite
Soft and slippery
Bonds per carbon atom in graphite
Bonds per carbon atom in graphite
Three bonds
Free electrons per carbon in graphite
Free electrons per carbon in graphite
One free electron
Why graphite conducts electricity
Why graphite conducts electricity
Free electrons can move through layers