Class notes
Solid state
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,1. Carbon to material thatNanotubes have potential provide are
tougher than steel
,
lighter than aluminium and have more conductive propertive than
opper
-
.
2
amorphous solids have microcrystalline structures . So these are called polycrystalline
Compounds
.
.
3
Amorphous solids Similar
have stucture that of liquids Sometimes
.
they are
regarded as extremely visors liquids .
4
.
Amorphous solids will become Crystallised at some temp .
.
5
Amorphors solids are also called as Pseudo solids or
supercooled liquids
.
6 Silicon the for
Amorphous is one of best photovoltaic material available conversion
of
Sunlight into electricity
.
.
7 classification of solids on the basis of intermolecular forces :
i) molecular solids :
9) non-polar molecular solids :
Held by London forces ex He , Ar , Hy , 2/ Fz
:
· · :
softs non-conductive
·
· liquid or gas at room temp .
and normal pressure
, 6) Polar molecular solids :
held
·
Strong dipole-dipole
together by interaction -
·
soft a non conductive solids
than non-polar solids of these
mp is
greater yet most
·
,
are
gas or liquids :
ex : HCI , So2 Solid So, Solid NH
·
&
, ,
2) hydrogen bonded molecular solids :
·
Strong H-bond binds them
·
non-conductor of electricity
·
they are
generally volatile liquids or soft solids under
room temp ,
and pressure
·
ex :
H20 lice)
ii) Ionic Solids :
·
formed by Swong Gulombic /electrostatic forces bl cations and anions
hard brittle nature
~
and in
·
high mp & B P
.
·
non-conductive in solid State but conductive at molten or dissolved
at water .
iii) Metallic solids :
·
the ions are surrounded by sea of e-
·
free e causes conductivity of
Electricity , heat and lustre in
metal
·
highy ductile and malleable
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