Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 4
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1014. Using the potential energy diagram below, estimate the values for E
, E
, and
a(fwd)
a(rev)
. Is the reaction endothermic or exothermic?
H
r
What Is Required?
You need to estimate the values for E
, E
, and H
based upon the given
a(fwd)
a(rev)
r
potential energy diagram and indicate if the reaction endothermic or exothermic.
What Is Given?
You have a potential energy diagram.
Plan Your Strategy
Act on Your Strategy
Refer to the scale on the y-axis and
Estimated values for E
, E
, and
a(fwd)
a(rev)
determine the difference in energy
are:
H
r
between the reactants and the transition
= +42 kJ
E
a(fwd)
state, E
; the difference in energy
= +67 kJ
E
a(fwd)
a(rev)
between the products and the transition
= –25 kJ
H
r
state, E
; and the difference between
a(rev)
the energy of the reactants and products,
The reaction is exothermic.
.
H
r
Check Your Solution
Check to be certain that you have counted the correct number of divisions when
determining the energies on the y-axis.
Unit 3 Part B
MHR 127
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