Giant covalent structures (Edexcel GCSE Chemistry): Flashcards
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What are giant covalent structures?
What are giant covalent structures?
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 of giant covalent structures
Melting/boiling points of 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
Do giant covalent structures conduct electricity?
Do giant covalent structures conduct electricity?
Most don't conduct; graphite is exception
Why most giant covalent structures don't conduct
Why most giant covalent structures don't conduct
No free-moving charged particles
Which giant covalent structure conducts electricity?
Which giant covalent structure conducts electricity?
Graphite
Describe graphite's structure
Describe graphite's structure
Layers of carbon atoms in hexagons
Why graphite is soft and slippery
Why graphite is soft and slippery
Layers slide easily; weak forces between them
How many bonds per carbon atom in graphite?
How many bonds per carbon atom in graphite?
Three
Why graphite conducts electricity
Why graphite conducts electricity
Free electrons move through layers
Forces between graphite layers
Forces between graphite layers
Weak