In your seat With penpencil 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 ID: 795596
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Slide1
Do Now
When the bell rings
In your seat:With pen/pencilWith NotebookWith HandoutPacket from last class on your deskSilent 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
Slide2Agenda
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)
Slide3Warm Up
In your small groups:10 minutes
Predict the ProductsAnswer on worksheet
1. What
would the products of the
following single replacement
reaction be?
2Al + 6HCl
2H2 + AlCl
3H
2
+ 2AlCl
3
Cl
2
+ AlH
3
No reaction will take place
2. What
would the products of the following reaction be?
Li
2
O + Ba
No
reaction will take place
2Li +
BaO
O
2
+
LiBa
2Li + Ba
2
O
Slide4Warm Up
In your small groups:5
minutesPredict the ProductsAnswer on worksheet
What would the products of the following single replacement reaction be?2Al + 6HCl
What would the products of the following reaction be?
Li
2
O + Ba
Slide5Exit Slip
How?
C – No talkingH – Raise handA – Taking exit slipM – In seatP – Completing exit slip without notes and turning in
What? (5 min)
If you finish early, summarize what you learned at the bottom of your notes OR answer today’s guiding question
Slide6Redox Reactions
Objectives:
Identify a redox reactionIdentify the species that is oxidized/reducedDescribe the working of electrochemical cells
Slide7Guiding Question
How does your cell phone battery work?
Slide8Pardon the
Interruption
Unit 4 Test is:Tuesday (A – Day)Wednesday (B Day)Covers:Types of ReactionsBalancing EquationsActivity Series (Last Class)Redox (TODAY!!!!)There is no in-class review day
Slide9Vocabulary 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.
Slide10Reduction - Oxidation Reactions
Often referred to as “Redox”Any chemical reaction where the oxidation number of a molecule, atom or ion changes
Example:Fe + O2 Fe2
O3
ON: 0
ON: 0
ON: -2
ON: +3
Slide11Oxidation Numbers
The Rules:
The oxidation number of an individual element is 0The oxidation number of an element in a compound is equal to the number of electrons lost or gainedThe oxidation numbers of atoms in a compound add up to 0The oxidation number of an ion is equal to its charge (Na
+, SO4-2)
4 Rules for Oxidation Numbers in chemical reactions
Slide12Rule #1
No matter the element, when it is alone in a chemical equation it is neutralExamples:
Na: 0O2: 02Pt: 0The oxidation number of an individual element is 0
Slide13Rule #2
ON of elements in compounds = the number of electrons lost/gained by each elementExamples:
The oxidation number of an element in a compound is equal to the number of electrons lost or gainedNaCl
BeF2
Slide14Rule #3
If I add up the charges in a compound, the total sum will be 0
Examples:The oxidation numbers of atoms in a compound add up to 0NaCl
BeF2
Slide15Rule #4
ON of ions = chargeExamples:Na
+ = +1SO4-2 = -2The oxidation number of an ion is equal to it’s charge
Slide16C.F.U.
Determine the oxidation numbers of the elements in the following reactions:
SCl-H
27Sn
Fe
2+
HBr
Provide the oxidation numbers for the following
Slide17Identifying Reduction/Oxidation
Oxidation
Lose electrons = oxidationEx: 0 +1Reduction
Gain electrons = reductionEx: 0
-1
Increase in
oxidation
number
Decrease in
oxidation
number
LEO the lion says GER
Slide18Identifying Reduction/
Oxidation
Na Na+S S-2
Be + F2 BeF
2
Ba + I
2
BaI
2
Identify oxidation or reduction
Remember:
LEO says GER
Slide19Identifying 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
+
LiClHow do you know if a reaction is Redox?????
Slide20CFU: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
Cl
2
+
NaBr
NaCl
+ Br
2
LiBr
+
CaO
Li
2
O + CaBr
2
Identify if the three reactions are redox reactions.
Slide21Activity: How it Works
How?
C: 0-1, no conversation unless you are the speakerH: Raise handA : Read pages 384-386 & answer questionsM: None, in seatP: 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
Slide22Electrochemical Cells
Created by Redox reactions
2 TypesGalvanic (aka Voltaic) CellEx: Non-rechargeable batteriesElectrolytic CellEx: Rechargeable batteries (while charging)
Slide23Independent Practice
How
C: 0 – 1, only on task conversationH: Raise hand, move on to next question until I am availableA: Completing Redox QuestionsM: None, in seats. 3 Hall passes.P: Answering questions on the handout, using notes
What15 minutes
Q
1: Identify as Oxidation or Reduction
Q
2: Identify which is oxidized and reducedQ3-9: Answer M.C.
Slide24Exit Slip
How?
C – No talkingH – Raise handA – Taking exit slipM – In seatP – Completing exit slip without notes and turning in
What? (5 min)
If you finish early, summarize what you learned at the bottom of your notes OR answer today’s guiding question
Slide25Closing
One thing you learned todayRemember: Unit 4 test next week
Study guide due before testHonor’s: Research Plan & Experiment Design due TODAY!!!!!
Don’t forget to stretch