Giant Covalent Structures (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards
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What are giant covalent structures?
What are giant covalent structures?
Huge networks of atoms bonded by covalent bonds
Name 3 examples of giant covalent structures
Name 3 examples of giant covalent structures
Diamond, graphite, silicon dioxide (silica)
What are the melting/boiling points of giant covalent structures?
What are the melting/boiling points of giant covalent structures?
Very high
Why do giant covalent structures have high melting points?
Why do giant covalent structures have high melting points?
Strong covalent bonds need lots of energy to break
Do most giant covalent structures conduct electricity? Why?
Do most giant covalent structures conduct electricity? Why?
No - they have 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 arranged in hexagons
Why is graphite soft and slippery?
Why is graphite soft and slippery?
Layers slide easily due to weak forces between them
How many bonds does each carbon atom form in graphite?
How many bonds does each carbon atom form in graphite?
Three bonds (leaving one electron free)
Why does graphite conduct electricity?
Why does graphite conduct electricity?
Free electrons can move through the layers