Giant covalent structures (Edexcel GCSE Chemistry Combined Science): Flashcards
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Giant covalent structures
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 high melting points in giant covalent structures
Why high melting points in giant covalent structures
Strong covalent bonds need lots of energy to break
Do giant covalent structures conduct electricity
Do giant covalent structures conduct electricity
Most don't
Why giant covalent structures don't conduct electricity
Why giant covalent structures don't conduct electricity
No free-moving charged particles
Which giant covalent structure conducts electricity?
Which giant covalent structure conducts electricity?
Graphite
Structure of graphite
Structure of graphite
Layers of carbon atoms arranged in hexagons
Why graphite is soft and slippery
Why graphite is soft and slippery
Layers slide over each other, held by weak forces
Number of bonds each carbon atom forms in graphite
Number of bonds each carbon atom forms in graphite
Three bonds
What is free in graphite after carbon forms 3 bonds?
What is free in graphite after carbon forms 3 bonds?
One electron per carbon atom
Why graphite conducts electricity
Why graphite conducts electricity
Free electrons can move through the layers