ch. 9: lesson 2 -intro to redox reactions- ch. 9: lesson 2 -intro to redox reactions-
TRANSCRIPT
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Ch. 9: Lesson 2-Intro to Redox Reactions-
Ch. 9: Lesson 2-Intro to Redox Reactions-
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Brief Charge ReminderBrief Charge Reminder
Electrons have a charge Neutral atoms have an overall charge of
Adding an e- makes charge go
Removing an e- makes charge go
Electrons have a charge Neutral atoms have an overall charge of
Adding an e- makes charge go
Removing an e- makes charge go
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Oxidation and ReductionOxidation and Reduction
Reduction is a gain of electrons (charge is reduced) Oxidation is a loss of electrons (charge is increased)
Ag Ag = =
Cl Cl = =
Reduction is a gain of electrons (charge is reduced) Oxidation is a loss of electrons (charge is increased)
Ag Ag = =
Cl Cl = =
+
-
Equation with e- Process
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Reduction reduces charge
Oxidation is just the other one
Reduction reduces charge
Oxidation is just the other one
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Identifying what’s oxidized and what’s reduced
Identifying what’s oxidized and what’s reduced
First assign oxidation #’s, then see how they change from start to finish
Ex: C + H2O CO + H2
First assign oxidation #’s, then see how they change from start to finish
Ex: C + H2O CO + H2
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Oxidation/Reduction PracticeOxidation/Reduction Practice
MnO2 + 4 HCl MnCl2 + Cl2 + 2 H2OMnO2 + 4 HCl MnCl2 + Cl2 + 2 H2O
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Redox ReactionsRedox Reactions
Redox reactions involve REDuction and OXidation SAT Word Alert: PORTMANTEAU
-THIS MEANS- Both have to happen at the same time
Redox reactions involve REDuction and OXidation SAT Word Alert: PORTMANTEAU
-THIS MEANS- Both have to happen at the same time
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Remembering How Redox Works
Remembering How Redox Works
LEO says GER: Losing e- is
Gaining e- is
OIL RIG Oxidation is e-
Reduction is e-
LEO says GER: Losing e- is
Gaining e- is
OIL RIG Oxidation is e-
Reduction is e-
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Conclusion QuestionsConclusion Questions
For Now: Review book page 162, # 11-15, on back of paper slips to hand in before you leave
For HW: same page, #16-25, in notebooks
For Now: Review book page 162, # 11-15, on back of paper slips to hand in before you leave
For HW: same page, #16-25, in notebooks
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Ch. 9: Lesson 3-Recognizing Redox Reactions
& Their Parts-
Ch. 9: Lesson 3-Recognizing Redox Reactions
& Their Parts-
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3 Forms of Redox Reactions3 Forms of Redox Reactions
A + B AB Ex: 2 H2 + O2 2 H2O
AB A + B Ex: 2 NaCl 2 Na + Cl2
A + BC AC + B Ex: Zn + Cu(NO3)2 Zn(NO3)2 + Cu
A + B AB Ex: 2 H2 + O2 2 H2O
AB A + B Ex: 2 NaCl 2 Na + Cl2
A + BC AC + B Ex: Zn + Cu(NO3)2 Zn(NO3)2 + Cu
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Recognizing Redox ReactionsRecognizing Redox Reactions
1. Single element(s) on either side of the equation
2 Li + Zn(NO3)2 2 Li(NO3) + Zn 2. Elements change oxidation # from reactant to
product
2 K + Cl2 2 KCl Increasing ox # means e- , was
Decreasing ox# means e- , was
1. Single element(s) on either side of the equation
2 Li + Zn(NO3)2 2 Li(NO3) + Zn 2. Elements change oxidation # from reactant to
product
2 K + Cl2 2 KCl Increasing ox # means e- , was
Decreasing ox# means e- , was
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AgentsAgents
Reducing agents cause something else to be reduced, but get oxidized themselves
Oxidizing agents cause something else to be oxidized, but get reduced themselves
2 Sr + O2 2 SrOReduced: Oxidized:
Reducing agent: Oxidizing agent:
Reducing agents cause something else to be reduced, but get oxidized themselves
Oxidizing agents cause something else to be oxidized, but get reduced themselves
2 Sr + O2 2 SrOReduced: Oxidized:
Reducing agent: Oxidizing agent:
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2 Cs + Br2 2 CsBr
3 Mg + N2 Mg3N2
4 Fe + 3 O2 2 Fe2O3
2 Cs + Br2 2 CsBr
3 Mg + N2 Mg3N2
4 Fe + 3 O2 2 Fe2O3
Ox:Rd:OxAg:RdAg:
Ox:Rd:OxAg:RdAg:
Ox:Rd:OxAg:RdAg:
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Spectator IonsSpectator Ions
Spectators are atoms or ions without a charge change, just along for the ride
Spectators are atoms or ions without a charge change, just along for the ride
Cu + 2 AgNO3 Cu(NO3)2 + 2 Ag
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Labeling Things In EquationsLabeling Things In Equations
Cu + 2 AgNO3 Cu(NO3)2 + 2 Ag Make sure equation is balanced, find ox# for each species
What is being oxidized?
What is being reduced?
What is the oxidizing agent?
What is the reducing agent?
Cu + 2 AgNO3 Cu(NO3)2 + 2 Ag Make sure equation is balanced, find ox# for each species
What is being oxidized?
What is being reduced?
What is the oxidizing agent?
What is the reducing agent?
Any spectator ions?
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Labeling Things In EquationsLabeling Things In Equations
Zn + 2 HCl ZnCl2 + H2
Make sure equation is balanced, find ox# for each species
What is being oxidized?
What is being reduced?
What is the oxidizing agent?
What is the reducing agent?
Zn + 2 HCl ZnCl2 + H2
Make sure equation is balanced, find ox# for each species
What is being oxidized?
What is being reduced?
What is the oxidizing agent?
What is the reducing agent?
Any spectator ions?
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Labeling Things In EquationsLabeling Things In Equations
NaCl + AgNO3 AgCl + NaNO3
Make sure equation is balanced, find ox# for each species
What is being oxidized?
What is being reduced?
What is the oxidizing agent?
What is the reducing agent?
NaCl + AgNO3 AgCl + NaNO3
Make sure equation is balanced, find ox# for each species
What is being oxidized?
What is being reduced?
What is the oxidizing agent?
What is the reducing agent?
This is double replacement.Double replacement’s arenot redox reactions.