Chapter 7- Networks and Nanomaterials Flashcards Preview

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Flashcards in Chapter 7- Networks and Nanomaterials Deck (12):
1

What are covalent network lattices?

Non-metals that have formed giant structures consisting of a countless number of atoms covalently bonded to one another/

2

What is the hardest known substance?

Diamond

3

What is diamond made up of?

Carbon atoms bonded together by strong covalent bonds.

4

What molecular shape does carbon make?

Three dimensional tetrahedral

5

What are some properties of covalent network lattices

-Particles held quite ridgly
-Hard and difficult to scratch
-High melting points
-Non-conductors of electricity
-Brittle

6

Define covalent layer lattices

Countless atoms held strongly together in planes of covalent bonds.
-present in only 2-d

7

What holds covalent layer lattices together?

-Weak dispersion forces

8

Explain the molecular structure of graphite

Layers of hexagonal rings with strong covalent bonds in two dimensions.
-only three out of the four valance electrons are being used
-The lone electron becomes de-localised and can move between layers

9

What is the molecular structure for bucky balls

Molecules of carbon arranged in a hollow sphere

10

Describe carbon nanotubes

-Continous tubes made up of flat sheets of hexagonal rings
-Essentially graphite rolled into cyclinder
-Can form a single layer, or layers of multiples

11

What is graphene?

A flat layer of carbon, one atom thick
-large surface area
-obtained from graphite
-conducts electricity better than any metal

12

Melting temperature for bucky balls

Low