Ch. 9: Lesson 2
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Ch. 9: Lesson 2 -Intro to Redox Reactions- PowerPoint PPT Presentation


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Ch. 9: Lesson 2 -Intro to Redox Reactions-. Brief 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. Oxidation and Reduction.

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Ch. 9: Lesson 2 -Intro to Redox Reactions-

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Ch 9 lesson 2 intro to redox reactions

Ch. 9: Lesson 2

-Intro to Redox Reactions-


Brief charge reminder

Brief 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


Oxidation and reduction

Oxidation and Reduction

  • 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

+

-


Ch 9 lesson 2 intro to redox reactions

  • Reduction reduces charge

  • Oxidation is just the other one


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


Oxidation reduction practice

Oxidation/Reduction Practice

MnO2 + 4 HCl  MnCl2 + Cl2 + 2 H2O


Redox reactions

Redox Reactions

  • Redox reactions involve REDuction and OXidation

  • SAT Word Alert: PORTMANTEAU

    -THIS MEANS-

  • Both have to happen at the same time


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-


Conclusion questions

Conclusion 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


Ch 9 lesson 2 intro to redox reactions

Ch. 9: Lesson 3

-Recognizing Redox Reactions & Their Parts-


3 forms of redox reactions

3 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


Recognizing redox reactions

Recognizing 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


Agents

Agents

  • 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 SrO

    Reduced: Oxidized:

    Reducing agent: Oxidizing agent:


Ch 9 lesson 2 intro to redox reactions

Ox:

Rd:

OxAg:

RdAg:

Ox:

Rd:

OxAg:

RdAg:

Ox:

Rd:

OxAg:

RdAg:

2 Cs + Br2 2 CsBr

3 Mg + N2 Mg3N2

4 Fe + 3 O2 2 Fe2O3


Spectator ions

Spectator Ions

  • Spectators are atoms or ions without a charge change, just along for the ride

Cu + 2 AgNO3 Cu(NO3)2 + 2 Ag


Labeling things in equations

Labeling 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?

Any spectator ions?


Labeling things in equations1

Labeling 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?

Any spectator ions?


Labeling things in equations2

Labeling 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?

This is double replacement.

Double replacement’s are

not redox reactions.


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