Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 2
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1012. Consider the following reaction:
AB + C → AC + B H
= +65 kJ, E
= +34 kJ
r
a(rev)
Draw and label a potential energy diagram for this reaction. Calculate and label
.
E
a(fwd)
What Is Required?
You need to draw a potential energy diagram labelling the x-axis and y-axis, the
transition state, and E
.
a(fwd)
What Is Given?
You know the balanced chemical equation for the reaction.
You know the activation energy of the reverse reaction: E
= +34 kJ
a(rev)
You know the enthalpy change of the forward reaction H
= +65 kJ
r
Plan Your Strategy
Act on Your Strategy
Use the formula
'
H
E
E
r
a(fwd)
a(rev)
to calculate
'
H
E
E
65 kJ
34 kJ
E
r
a(fwd)
a(rev)
a (fwd)
.
E
E
99 kJ
a(fwd)
a fwd
Draw and label the potential
energy diagram.
Check Your Solution
Since the sign of H
is positive, the reaction is endothermic and the potential energy
r
diagram shows the reactants at a lower energy than the products.
Unit 3 Part B
MHR 125
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