1. Do Now When the bell rings After the bell (2 min) In your seat:
With pen/pencil
With Notebook
With Handout
Packet from last class on your desk
Silent and ready for Do Now
Answer the following riddle: What occurs once in a minute, twice in a moment and never in one thousand years? A: The letter M
Still needs Do Now

2. Agenda  Do Now (5 min) Warm Up (15 min) Exit Slip (3 min)
Notes: Redox Reactions (20 min)
Independent Practice (15 min)
Activity: Electrochemical Cells (15 min)
Closeout (2 min) 

3. 1. What would the products of the following single replacement reaction be?
2Al + 6HCl 
2H2 + AlCl
3H2 + 2AlCl3
Cl2 + AlH3
No reaction will take place
2. What would the products of the following reaction be?
Li2O + Ba 
2Li + BaO
O2 + LiBa
2Li + Ba2O
Warm Up
In your small groups:
10 minutes
Predict the Products
Answer on worksheet

4. Warm Up
What would the products of the following single replacement reaction be?
2Al + 6HCl 
What would the products of the following reaction be?
Li2O + Ba 
In your small groups:
5 minutes
Predict the Products
Answer on worksheet

5. 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

6. Redox Reactions Objectives: Identify a redox reaction
Identify the species that is oxidized/reduced
Describe the working of electrochemical cells

7. Guiding Question
How does your cell phone battery work?

8. Pardon the Interruption
Unit 4 Test is:
Tuesday (A – Day)
Wednesday (B Day)
Covers:
Types of Reactions
Balancing Equations
Activity Series (Last Class)
Redox (TODAY!!!!)
There is no in-class review day
Pardon the Interruption

9. 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.

10. Reduction - Oxidation Reactions
Often referred to as “Redox”
Any chemical reaction where the oxidation number of a molecule, atom or ion changes
Example:
Fe + O2  Fe2O3
ON: 0
ON: +3
ON: 0
ON: -2

11. Oxidation Numbers 4 Rules for Oxidation Numbers in chemical reactions
The Rules:
The oxidation number of an individual element is 0
The oxidation number of an element in a compound is equal to the number of electrons lost or gained
The oxidation numbers of atoms in a compound add up to 0
The oxidation number of an ion is equal to its charge
(Na+, SO4-2)
Oxidation Numbers
4 Rules for Oxidation Numbers in chemical reactions

12. Rule #1
No matter the element, when it is alone in a chemical equation it is neutral
Examples:
Na: 0
O2: 0
2Pt: 0
The oxidation number of an individual element is 0

13. ON of elements in compounds = the number of electrons lost/gained by each element
Examples:
Rule #2
The oxidation number of an element in a compound is equal to the number of electrons lost or gained
NaCl
BeF2

14. If I add up the charges in a compound, the total sum will be 0
Examples:
Rule #3
The oxidation numbers of atoms in a compound add up to 0
NaCl
BeF2

15. Rule #4 ON of ions = charge Examples: Na+ = +1 SO4-2 = -2
The oxidation number of an ion is equal to it’s charge

16. Determine the oxidation numbers of the elements in the following reactions:
Cl- H2
7Sn
Fe2+
HBr
C.F.U.
Provide the oxidation numbers for the following

17. Identifying Reduction/Oxidation
Lose electrons = oxidation
Ex: 0  +1
Gain electrons = reduction
Ex: 0  -1
LEO the lion says GER
Increase in
oxidation
number
Decrease in
oxidation
number

18. Identifying Reduction/ Oxidation
Na  Na+
S  S-2
Be + F2  BeF2
Ba + I2  BaI2
Identify oxidation or reduction
Remember:
LEO says GER

19. Identifying Redox Reactions
Is the oxidation # of an element on the reactant side different than the oxidation # on the product side??
Examples:
Fe + O2  Fe2O3
NaCl + LiI  NaI + LiCl
Identifying Redox Reactions
How do you know if a reaction is Redox?????

20. CFU: Identifying 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:
H2 + O2  H2O
Cl2 + NaBr  NaCl + Br2
LiBr + CaO  Li2O + CaBr2
CFU: Identifying Redox Reactions
Identify if the three reactions are redox reactions.

21. Activity: How it Works How? What? Answer: What is a battery?
C: 0-1, no conversation unless you are the speaker
H: Raise hand
A : Read pages & answer questions
M: None, in seat
P: Reading along, reading aloud when called on, thinking through the questions, taking notes, answering questions
Answer:
What is a battery?
How does a battery work?
Give an example of a wet cell battery AND a dry cell battery

22. Electrochemical Cells
Created by Redox reactions
2 Types
Galvanic (aka Voltaic) Cell
Ex: Non- rechargeable batteries
Electrolytic Cell
Ex: Rechargeable batteries (while charging)

23. Independent Practice What How 15 minutes
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
15 minutes
Q1: Identify as Oxidation or Reduction
Q2: Identify which is oxidized and reduced
Q3-9: Answer M.C.

24. 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

25. Closing Don’t forget to stretch One thing you learned today
Remember: Unit 4 test next week
Study guide due before test
Honor’s: Research Plan & Experiment Design due TODAY!!!!!