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Helena Bonici Chemistry 26/09/2011
13EA2Kinetics




ENTROPY
In addition to enthalpy (heat content), there is another important thermodynamic aspect of all
chemical reactions - entropy.

Entropy = A measure of the amount of randomness or disorder in a system. (S ~ j/k-mole)

All substances, be they individual atoms of a single…

Page 2

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Helena Bonici Chemistry 26/09/2011
13EA2Kinetics




than
the
reacta
nt
side,
the
syste
m has
beco
me
more
rando
m
more
partic
les
movi
ng
about
is a
more
rando
m
state
than
fewer
partic
les
movi
ng
about.
Increa
sing
the
tempe
rature
. An
increa
se in
tempe
rature…

Page 3

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Helena Bonici Chemistry 26/09/2011
13EA2Kinetics




heat
energ
y,
increa
ses
molec
ular
motio
n
which
in
turn
increa
ses
the
degre
e of
rando
mness

+H -H
+Ssys CaCO3 CaO + CH4 H2O +
CO2 CO2
-Ssys - NH3 + HCl
NH4Cl
It
won't
occur
sponta
neously.
It is the…

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Helena Bonici Chemistry 26/09/2011
13EA2Kinetics

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