SOLIDS

Question 1

Amorphous vs Crystalline

Answer 1

A-particles randomly arranged

C-particles arranged in pattern

Question 2

what are molecular solids

Answer 2

molecules held together by intermolecular forces
low MP
low conductivity
efficient packing of molecules

Question 3

Metallic Solids?

Answer 3

consists entirely of metals

Question 4

Ionic solids?

Answer 4

consist of ions held together by ionic bonds

hard with High MP’s

Question 5

Covalent-network solids

Answer 5

atoms held together with covalent bonds
high MP’s and harder than molecular solids
ex) diamond

Question 6

Insulators for solids

Answer 6

large gap

(an energy difference between filled and empty band

Question 7

Semiconductors

Answer 7

smaller band gap

Question 8

What is doping?

Answer 8

adding controlled amounts of an impurity to the semiconductor

Question 9

semiconductors tend to have…?

Answer 9

4 valence electrons

conductivity can be increased by doping

Question 10

what happens with the n-type semiconductors?

Answer 10

dopant atom has more VE than the host atom

-electrons added to conduction band

Question 11

what happens with the p-type semiconductors?

Answer 11

dopant atom has fewer VE than host atom

-holes in valence band