Outcome 2- Networks and Nano's Flashcards Preview

Unit 1 Chem > Outcome 2- Networks and Nano's > Flashcards

Flashcards in Outcome 2- Networks and Nano's Deck (12):
1

One Property Shared by Graphite and Diamond

High Boiling point

2

One Property differes for graphite and diamond

Electrical conductivity

3

Why would fullerene nanoparticles be expected to be good conductors of electricity?

The Delocilasied electrons are more able to move through the dispersion forces of the fulllerene nano particles because each carbon atom is not covelantly bonded to all 4 of its electrons unlike diamond .

4

Diamond

Hardest substance due to all 4 carbon molecules coveantly bonding to one another making a rigid internal lattice structre

5

Properties of Covelant Network Lattices (Diamond)

Very hard, difficult to scratch and have high melting points. Since there are no free moving ions or electrons they are non conductors of electricity. Chemically inhert and insoulble in water

6

Graphite

Flat sheets of carbon on top of each other by dispersion forces. Graphite only covelantly bonds to 3 of its carbon atoms making it a more 2 dimensional lattice. Graphite is a good conductor of electricity because of its free moving outer shell that is not bonded to any other carbon atom

7

Difference betweeen Graphite and Graphene

Graphite are flat layers of carbon that are held together by weak dispersion forces which allows them to easily slide over each other. Graphene on the other hand is one flat sheet of carbon and is incredibly strong

8

Network Covalent Lattice

Strong Bonding (High Melting point) and No charged particles (No electrical conductivity)

9

Other Covalent networks

Silicon dioxide

10

Why would silicon have lower melting point than diamond

Silicon Atoms are larger than carbon atoms. This makes the si-si bonds length longer than the C-C bonds and are not as strong.

11

Silicon

A continuous covalent lattice of Si atoms. Each Si is bonded to 4 other Si atoms in a tetrahedral arrangment

12

Covalent Molecular Substance

Relatively weak bonds between molecules (Low melting point)