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Enthalpy
Enthalpy is the heat energy stored
within a chemical system, measured at a
constant pressure
It is impossible to measure enthalpy
directly. We can only measure the
change in enthalpy between 2 chemical
systems:
Products
Reactants
capital Greek letter delta which
means change in…read more

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Energy Profile Diagrams
Enthalpy profile diagrams show the
change in enthalpy between reactants
and products
Energy Products have
less energy than
the reactants
=Enthalpy of
prodcuts0
enthalpy of
reactants
is a negative…read more

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Exothermic Reaction
In exothermic reactions:
e e
Syste e
e
m
e
e
System loses heat energy to surroundings
Surroundings gain energy, so the temperature of the surrounding increases
In experiments, we measure the temp of the surroundings and not the
temperature of the reaction
REACTIONS THAT PORDUCE A TEMPRETURE RISE ARE EXOTHERMIC
Products have more energy
than the reactant
Enthalpy of products- Enthalpy
of reactants…read more

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Endothermic Reactions e
e
In endothermic reactions Syste e
m
System- Energy is absorbed from the surroundingse e
e
- The temperature of the surroundings decreases
Reactions that are accompanied by a temperature decrease are
always Endothermic…read more

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Bonds Breaking/Forming
The bond breaking process requires energy-
endothermic
The bond forming process releases energy
to the surroundings- exothermic process
Another way for determining the enthalpy
change:
= bonds broken- bonds formed
Enthalpy change in the difference in the
strengths of covalent bonds between atoms
in reaction and atoms in products…read more

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