Giant covelant bonds Flashcards
(6 cards)
1
Q
What are giant covalent structures?
A
Networks of atoms bonded strongly by covalent bonds (e.g. diamond, silicon dioxide).
2
Q
Why do giant covalent structures have high melting points?
A
You must break strong covalent bonds throughout the structure.
3
Q
What are alloys?
A
Mixtures of metals with different-sized atoms to disrupt layers and strengthen the material.
4
Q
What is diamond?
A
An allotrope of carbon; each atom makes 4 strong bonds, very hard, no free electrons.
5
Q
What is graphite?
A
Each carbon makes 3 bonds, with delocalised electrons. Can conduct electricity. Layers slide.
6
Q
What is graphene?
A
Single layer of graphite. Strong, light, conducts electricity.
