DO NOW
When the bell rings
In
your seat:
With
pen/pencil
With
Notebook
With
Handout
Silent
and ready
for Do Now
After the bell (2 min)
Read and answer the
following riddle:
I’m tall when I’m
young and I’m short
when I’m old. What
am I?
AGENDA
 Do Now (5 min)


Warm Up: (15 min)
Notes: Potential Energy
Diagrams(20 min)


Group Practice (15 min)
Independent Practice(15
min)


Closeout (2 min)
WARM UP (2 MIN)
• Redraw
this
heating
curve
and
label
•
Solid
•
Liquid
•
Gas
•
Melting
•
Freezing
•
Boiling
•
Condensati
on
•
Sublimation
•
Deposition
WARM UP
•
Where on the heating
curve does potential
energy increase?
•
What happens to the
temperature of a
substance when it is
boiling?
UNIT: THERMODYNAMICS
TOPIC: POTENTIAL ENERGY
DIAGRAMS
Objective:
Construct and interpret potential energy
diagrams for chemical reactions
How
can you show what
happens to energy during a
chemical reaction?
GUIDING QUESTION
Potential
Energy (PE): the energy stored in a
substance (measured in KJ)
Activation
Energy (Ea): The amount of energy
needed to make a reaction occur.
Heat
of Reaction (∆H): The difference in potential
energy of reactants and products
(PE Products – PE Reactants)
Catalyst:
A substance that lowers the activation
energy of a reaction
VOCABULARY AND
DEFINITIONS
KP #1:
POTENTIAL
ENERGY
•
Potential Energy (PE):
The energy stored in a
substance
•
Turn & Discuss:
•
What real-life
examples can you
think of that
demonstrate potential
energy?
KP #2: P.E.
DIAGRAMS
1.
KP #2: P.E.
DIAGRAMS
Check for
Understanding:
1. What is the value
of the PE Reactants?
2. What is the value
of the PE Products?
3. What is the
activation energy?
KP #2: P.E.
DIAGRAMS
1.
Sometimes
reactions go in
reverse.
KP #2: P.E.
DIAGRAMS
Check for
Understanding:
Draw the reverse and
4. What is the value of
the PE Reactants?
5. What is the value of
the PE Products?
6. What is the
activation energy?
KP #3: ∆H

The difference
between the
PE of the
Products and
the Reactants.

Also called
enthalpy
change
KP #3: ∆H
Check for
Understanding:
7. What is the ∆H of
the reaction to the
right.
KP #4:
CATALYST
What effect does
adding a
catalyst have on
a chemical
reaction?
•
Lowers the
activation
energy
GROUP PRACTICE
How
 C:
1 – 2, only on task
conversation
 H:
Raise hand, move on to
next question until I am
available
 A:
Completing questions
 M:
In clusters. 3 Hall passes.
 P:
Answering questions on
worksheet, using notes, head
up, discussing
What
15 minutes
All
heads together
 One
sheet
 Answers
on worksheet
INDEPENDENT PRACTICE
What
How
 C:
0 – 1, only on task
conversation
 H:
Raise hand, move on to next
question until I am available
 A:
Completing questions
 M:
In clusters. 3 Hall passes.
 P:
Answering questions on
notebook paper, using notes,
head up, discussing in groups,
using boxes
15
minutes
Complete
practice on
reverse side of notes
EXIT SLIP
What? (5 min)
How?
C
– No talking
H
– Raise hand
A
– Taking exit
slip
M
P
– In seat
– Completing
exit slip without
notes and
turning in
 Write
answers on the
paper you were given
 If
you finish early,
summarize what you
learned at the bottom of
your notes OR answer
today’s guiding question
Exit Slip
Identify
each of
the following:
1.
PE reactants
2.
PE Products
3.
Activation
energy
4.
∆H
5.
Ea of reverse
reaction