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Module 3 Periodic table and Energy
reaction rates and equilibrium
Kc
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Equilibrium constant, K
A measure of the
position
of equilibrium; the magnitude of an equilibrium constant indicates whether there are more
reactants
or more products in an equilibrium
system
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when expressing Kc you must put
products
over
reactants
and use
square
brackets
square brackets are shorthand for the
'concentration
of'
a, b, c, d are the balancing numbers in the overall equation and the
powers
in Kc expression
a Kc value of 1 tells us a position of equilibrium is
halfway
between reactants and products
a Kc value >1 indicates a position of equilibrium towards
products
a Kc value <1 indicates a position of equilibrium towards
reactants
the
larger
the Kc value
the further the position of equilibrium lies to the
right
hand side
the greater the concentrations of the
products
compared to the reactants
Kc is for
concentration
aA + bB = cC +dD so C and D go over A and B because
products
over
reactants
Bigger Kc value, equilibrium on
right
Smaller Kc value, equilibrium on
left
Kc only changes if you change the
temp
unit is
mol
per
dm3
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