Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 6
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1016. For a reaction, on an arbitrary scale, the potential energies are as follows: activated
complex, +112 kJ; reactants, +36 kJ; products, +78 kJ.
a. Determine the activation energy and the enthalpy change for the reaction.
b. Draw a labelled potential energy diagram for the reaction, indicating the relative
energies of the reactants, products, and activated complex.
What Is Required?
You need to determine the activation energy, E
, and the enthalpy change, H
, for the
a
r
reaction.
You need to draw a potential energy diagram for the reaction.
What Is Given?
You know the potential energies: activated complex, +112 kJ; reactants, +36 kJ;
products, +78 kJ.
Plan Your Strategy
Act on Your Strategy
a. The activation energy is the
112 kJ 36 kJ
E
a
difference between the potential
76 kJ
energy of the activated complex and
'
78 kJ 36 kJ
the potential energy of the reactants.
H
42 kJ
The enthalpy change is the
difference in potential energy
between the products and reactants.
Estimate the energy scale (y-axis)
that will include the calculated
differences in energy.
b. Draw and label the potential
energy diagram.
Check Your Solution
The sign of the enthalpy change is positive, and the diagram will show the potential
energy of the reactants lower than the potential energy of the products.
Unit 3 Part B
MHR 129
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