Do Now
When the bell rings
 In
your seat:
With
pen/pencil
With
Notebook
With
Handout
Packet
from last class
on your desk
Silent
and ready for
Do Now
After the bell (2 min)
Answer the following
riddle:
What occurs once in a
minute, twice in a
moment and never in
one thousand years?
A: The letter M
Agenda
 Do Now (5 min)


Warm Up (15 min)

Exit Slip (3 min)
 Notes:
min)
Redox Reactions (20
 Independent
min)
Practice (15
 Activity:
Electrochemical
Cells (15 min)
 Closeout
(2 min)
1. What would the products of the following single
replacement reaction be?
2Al + 6HCl 
a.2H2 + AlCl
b.3H2 + 2AlCl3
c.Cl2 + AlH3
d.No reaction will take place
In your small
2. groups:
What would the products of the following
reaction
be?
• 10 minutes
Li2O + Ba 
• Predict the
a.No reaction will take place
Products
b.2Li + BaO
• Answer
on
c.O
+
LiBa
2
d.2Liworksheet
+ Ba2O
Warm Up
1.
Warm Up
2Al + 6HCl 
In your small
groups:
•
5 minutes
•
Predict the
Products
•
Answer on
worksheet
What would the
products of the
following single
replacement reaction
be?
2.
What would the
products of the
following reaction be?
Li2O + Ba 
Exit Slip
What? (5 min)
How?
C – No talking
 H – Raise hand
 A – Taking exit
slip
 M – In seat
 P – Completing
exit slip without
notes and
turning in

 If
you finish early,
summarize what you
learned at the bottom
of your notes OR
answer today’s guiding
question
Redox Reactions
OBJECTIVES:
1.
IDENTIFY A REDOX REACTION
2.
IDENTIFY THE SPECIES THAT IS OXIDIZED/REDUCED
3.
DESCRIBE THE WORKING OF ELECTROCHEMICAL CELLS
Guiding
Question
How
does your
cell phone
battery work?

 Tuesday
Pardon the
Interruption
Unit 4 Test is:
(A – Day)
 Wednesday

Covers:
 Types
of Reactions
 Balancing
 Activity
Class)
 Redox

(B Day)
Equations
Series (Last
(TODAY!!!!)
There is no in-class review
day
Vocabulary and Definitions

Oxidation Number: a positive or negative number assigned
to each atom in a compound to help keep track of the
electrons in a chemical reaction. Elements are zero.

Oxidation: the loss of one or more electrons by a substance.

Reduction: the gain of one or more electrons by an atom,
molecule or ion, resulting in a greater negative charge.

Electrochemical cell: a system that produces an electric
current through an oxidation-reduction reaction.
Reduction Oxidation
Reactions
 Often
referred to as
“Redox”
 Any chemical
Example:
reaction where the
Fe + O2  Fe2O3
oxidation number of
a molecule, atom or
ON: 0
ON: +3
ON: 0
ON: -2 ion changes
Oxidation
Numbers
4 Rules for
Oxidation
Numbers in
chemical
reactions
 The
Rules:
1.
The oxidation number of an
individual element is 0
2.
The oxidation number of an
element in a compound is
equal to the number of
electrons lost or gained
3.
The oxidation numbers of atoms
in a compound add up to 0
4.
The oxidation number of an ion
is equal to its charge
(Na+, SO4-2)
 No
Rule #1
The oxidation
number of an
individual element
is 0
matter the
element, when it is
alone in a chemical
equation it is neutral
 Examples:
Na:
0
O2:
0
2Pt:
0
 ON
Rule #2
The oxidation
number of an
element in a
compound is equal
to the number of
electrons lost or
gained
of elements in
compounds = the
number of electrons
lost/gained by each
element
 Examples:
NaCl
BeF2
 If
Rule #3
The oxidation
numbers of atoms
in a compound
add up to 0
I add up the
charges in a
compound, the total
sum will be 0
 Examples:
NaCl
BeF2
Rule #4
The oxidation
number of an
ion is equal to
it’s charge
ON
of ions =
charge
Examples:
Na+ =
+1
SO4-2 = -2
C.F.U.
Provide the
oxidation
numbers for the
following
Determine the oxidation
numbers of the elements in the
following reactions:
1. S
2. Cl3. H2
4. 7Sn
5. Fe2+
6. HBr
Identifying Reduction/Oxidation
Oxidation
Reduction
 Lose
 Gain
 Ex:
 Ex:
electrons =
oxidation
0  +1
electrons =
reduction
0  -1
LEO the lion says GER
Increase in
oxidation
number
Decrease in
oxidation
number
Identifying
Reduction/
Oxidation
Identify oxidation
or reduction
Remember:
LEO says GER
1. Na
+
Na

2. S  S-2
3. Be + F2  BeF2
4. Ba + I2  BaI2
Identifying
Redox
Reactions
 Is
How do you
know if a
reaction is
Redox?????
 Examples:
the oxidation # of an element
on the reactant side different
than the oxidation # on the
product side??
1.
Fe + O2  Fe2O3
2.
NaCl + LiI  NaI + LiCl
CFU:
Identifying
Redox
Reactions
Identify if the
three
reactions are
redox
reactions.
 Is
the oxidation # of an
element on the reactant side
different than the oxidation #
of an element on the
product side??
 You
Do:
1.
H2 + O2  H2O
2.
Cl2 + NaBr  NaCl + Br2
3.
LiBr + CaO  Li2O + CaBr2
Activity: How it Works
How?

C: 0-1, no conversation unless
you are the speaker

H: Raise hand

A : Read pages 384-386 &
answer questions

M: None, in seat

P: Reading along, reading
aloud when called on,
thinking through the
questions, taking notes,
answering questions
What?
 Answer:
 What
is a battery?
 How
does a battery
work?
 Give
an example of
a wet cell battery
AND a dry cell
battery
Electrochemical Cells

Created by Redox
reactions

2 Types
1.
Galvanic (aka Voltaic)
Cell
Ex:
Nonrechargeable
batteries
2.
Electrolytic Cell
Ex:
Rechargeable
batteries (while
charging)
Independent Practice
How

C: 0 – 1, only on task
conversation

H: Raise hand, move on to next
question until I am available

A: Completing Redox
Questions

M: None, in seats. 3 Hall
passes.

P: Answering questions on the
handout, using notes
What
 15
minutes
 Q1: Identify as
Oxidation or
Reduction
 Q2: Identify which
is oxidized and
reduced
 Q3-9: Answer M.C.
Exit Slip
What? (5 min)
How?
C – No talking
 H – Raise hand
 A – Taking exit
slip
 M – In seat
 P – Completing
exit slip without
notes and
turning in

 If
you finish early,
summarize what you
learned at the bottom
of your notes OR
answer today’s guiding
question
Don’t forget
to stretch
Closing

One thing you learned
today

Remember: Unit 4 test next
week

Study guide due before
test

Honor’s: Research Plan &
Experiment Design due
TODAY!!!!!