Transcript 452ATTRACTIONSMAP

Much weaker
than bonds
CLASSIFICATION:
-DISPERSION
-DIPOLE-DIPOLE
-HYDROGEN
BONDING
DISPERSION FORCES
-WEAK ATTRACITVE
FORCE, HOLDS ATOMS
CLOSE, “STICKY”
BOIL
- AVERAGE KINETIC ENERGY
OVERCOMES INTER
MOLECULAR FORCES. (100 C
FOR WATER)
HIGHER KE LEVELS
CORRESPOND TO STRONGER
ATTRACTIONS AND HIGHER
B.P.
BOLILING POINT INCREASES
WITH ATOMIC SIZE (MASS),
DISPERSION FORCES
INCREASE WITH ATOMIC SIZE.
As a solid substance
absorbs kinetic
energy from the
environment.
Caus
es
Attractions are
weakened,
allowing particle
motion, fluidity,
LIQUID.
Caus
es
Further energy breaks
the attractions to give
random motion of the
GAS phase.
INCREASEING KINETIC ENERGY (MEASURED AS TEMPERATURE)
SOLID – strong
attractions fix particles in
place, lowest energy phase
of a particular substance.
MELTING
LIQUID- attractions weakend
by K.E. allow some motion,
fluidity of a liquid
FREEZING
GAS – the energy level is high,
EVAPORATION
CONDENSATION
attractions are broken which
allows random, straight-line
independent movement of
particles.