Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B
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10Representing a Reaction with a Potential Energy Diagram
(Student textbook page 371)
11. Complete the following potential energy diagram by adding the following labels: an
appropriate label for the x-axis and y-axis, E
, E
, H
.
a(fwd)
a(rev)
r
a. Is the forward reaction endothermic or exothermic?
b. Which has the higher potential energy, the reactants or the products?
What Is Required?
You need to label the given potential energy diagram, determine if the reaction is
exothermic or endothermic and indicate which has the higher potential energy,
reactants or products.
What Is Given?
You have an unlabelled potential energy diagram.
Plan Your Strategy
Act on Your Strategy
The y-axis is an energy scale, and
a. The reaction is endothermic.
the x- axis follows the reaction
b. The products have a higher potential energy
progress. The reactants will be
than the reactants.
shown as the first level portion, and
the products will be the second
level portion of the diagram. The
activation energy in the forward
direction, E
, is the difference
a(fwd)
between the reactant energy and the
transition state at the peak of the
diagram. The activation energy for
the reverse reaction, E
, is the
a(rev)
difference between the product
energy and transition state at the
peak of the diagram. H
is the
r
difference between the potential
energy of the reactant and the
potential energy of the product.
Check Your Solution
The potential energy of the reactant is lower than the potential energy of the product.
This corresponds to an endothermic reaction.
124 MHR
Chemistry 12 Solutions Manual 978-0-07-106042-4
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