Summary
Summary A level chemistry summarised equation sheet for the whole subject
- Module
- Unit 3.1.4 - Energetics
- Institution
- AQA
Includes every equation you need to know for your a level exams into one book.
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, Revision notescixs
energe
3
Enthalpy
1 4 1
change
-
.
. .
DH break bonds
energy to
·
+ DH endothermic to make bod
is
reaction
energy
=
= +
-
Ah =
exothermic reaction
c -
ve)
Enthalpy of formation CDHHS) :
The enthalpy change when one mole of a substance is formed from its constituent elements
under Standard States and Standard Condition
equation : [AP products) -
EDH + creactants)
Enthalpy of Combustion (ACHP) , The
enthalpy change when one more of a substance is
completely
burned in under Standard states
Oxygen and stand and conditioned
.
3 1 4 2 . . . -
Calorimetry
↳ Experimental Method for finding enthalpy change by Semperature Over
measuring time .
This measured
change in T is proportion ar to
energy change
.
q =
MC T =energy change -Specific heat capacity
m =
Mass(g) AT =
semperature change
Specific heat capacity - The energy required to raise Ig of substance by IK without a
change ofState .
DH = I n = moles
N
DHT
. 1 4 3- Hese's A >
H
3 Law e
g
.
.
.
·
Energy in a reaction system must be conserved .
=
H + H
Hess's Law is used
DH DH2
to determine the enthalpy change of a reaction
-
C
that cannot be found directly using an experimental method
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