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Cards (11)
Enthalpy change
Change in
energy
during a
reaction
at
constant
pressure
Activation energy-
minimum
amount of
energy
required to begin
breaking
bonds and
start
a
chemical
reaction
Standard enthalpy change of
formation
Enthalpy change when
1
mole
of a compound is
formed
from its elements under
standard
states and
conditions
Standard enthalpy change of
combustion
Enthalpy change when
1
mole
of a substance is completely
burned
in
oxygen
and released under
standard
conditions
Standard enthalpy change of
neutralisation
Enthalpy change when
1
mole
of an acid
and
an alkali react together under standard conditions to form 1
mole
of
water
Hess' law:
Total
enthalpy change is
independent
of the route which the chemical
reaction
takes place
Standard conditions: temperature
298K
, pressure
100kPa
, solutions
1moldm-3
Bond breaking
Endothermic
Bond making
Exothermic
Bond Enthalpy
The Enthalpy change that takes place when breaking by
homolytic fission
1 mol of a given
bond
in the molecule of a
gaseous
species
Standard Enthalpy change of
reaction
Enthalpy change when the reaction occurs in the
molar quantities
shown in the
chemical equation
