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Cynthia Mathis
Cynthia Mathis
(Reno - United States)

Redox Reactions

Slideshow: Redox Reactions

This resource is a PowerPoint presentation on redox reactions. Topics covered include: oxidation, reduction, oxidation numbers, 6 rules, oxidizing agents, and reducing agents.

This resource is part of the Chemistry course which contains units on Lab Setup and Safety; Nomenclature; Chemical Reactions and Balancing; Metric Systems & Conversions; Periodic Table and Trends; Atomic Structure; Nuclear Chemistry; Acids, Bases, & Salts; Bonding; Percent Composition; Solutions, Molarity, and Concentrations; Stoichiometry; Energy; Gas Laws; Reaction Rates and Equilibrium; Electron Configuration; and Redox Reactions.

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Lab: Copper or Aluminum Foil

 

In this lab, student try to explain what happens when copper chloride is placed in water, and how aluminum foil place in that solution reacts.

Key Concept: Oxidation-reduction reactions occur when there is a transfer of electrons between reactants.

Objectives: 1) Explain what occurs when copper chloride is placed in water. 2) Observe and describe what occurs when aluminum foil is placed into a beaker of copper chloride solution.

This resource is part of the Chemistry course which contains units on Lab Setup and Safety; Nomenclature; Chemical Reactions and Balancing; Metric Systems & Conversions; Periodic Table and Trends; Atomic Structure; Nuclear Chemistry; Acids, Bases, & Salts; Bonding; Percent Composition; Solutions, Molarity, and Concentrations; Stoichiometry; Energy; Gas Laws; Reaction Rates and Equilibrium; Electron Configuration; and Redox Reactions.

Worksheet: Oxidation Chart

This resource is a worksheet with a grid with compounds down the left side and elements across the top. Students fill in the correct oxidation number for each element.

This resource is part of the Chemistry course which contains units on Lab Setup and Safety; Nomenclature; Chemical Reactions and Balancing; Metric Systems & Conversions; Periodic Table and Trends; Atomic Structure; Nuclear Chemistry; Acids, Bases, & Salts; Bonding; Percent Composition; Solutions, Molarity, and Concentrations; Stoichiometry; Energy; Gas Laws; Reaction Rates and Equilibrium; Electron Configuration; and Redox Reactions.

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Worksheet: Redox Reactions

Oxidation – Reduction Reactions

For #s 1 – 6, consider each of the following atom/ion pairs and indicate how many electrons have been gained or lost, balance the reaction if necessary, and tell if that represents oxidation or reduction:

 

1)              Mn+7       Mn+2 

 

 

2)              Cl2       Cl-

 

 

3)              Fe+2       Fe+3 

 

 

4)              S-2       S 

 

 

5)              Cu+       Cu+2   

 

 

6)              Br-       Br2  

 

 

For #s 7 – 10: (1) assign oxidation numbers to each atom in the following reactions; (2) write the oxidation and reduction half reactions; (3) identify the oxidizing agent & reducing agent.

 

 

7)    Zn(s)  +  Cu2+(aq)    Zn+2(aq)  +  Cu(s) 

 

oxidation half reaction:

 

reduction half reaction:

 

oxidizing agent:

reducing agent:

 

 

 

8)    Cl2(g)  +  2Br-(aq)    2Cl-(aq)  +  Br2(s) 

 

oxidation half reaction:

 

reduction half reaction:

 

oxidizing agent:

reducing agent:

 

 

 

9)    Mg(s)  +  Ca2+(aq)    Mg+2(aq)  +  Ca(s) 

 

oxidation half reaction:

 

reduction half reaction:

 

oxidizing agent:

reducing agent:

 

 

 

10) Fe(s)  +  Ni3+(aq)    Fe+2(aq)  +  Fe(s) 

 

oxidation half reaction:

 

reduction half reaction:

 

oxidizing agent:

reducing agent:

 

 

 

11) SO2(g)  +  H2O(l)    H2SO4(aq)  

 

oxidation half reaction:

 

reduction half reaction:

 

oxidizing agent:

reducing agent:

 

 

 

12) NO(g)  +  H2O(l)    HNO3(aq) 

 

oxidation half reaction:

 

reduction half reaction:

 

oxidizing agent:

reducing agent:

 

 

 

 

 

 

Worksheet: Redox Reactions and the Activity Series

Redox Reactions & the Activity Series

 Directions:  Using the activity series in your notes, determine if the following single replacement reactions will occur.  If no, simply write “NR” for No Reaction.  If the reaction will occur, then:  (1) predict the products of the reaction;  (2) balance the reaction;  (3) identify the substances oxidized and reduced;  (4) identify the oxidising and reducing agents;  and (5) write the oxidation and reduction half reactions.

 

1)      Zn(s)  +  KF(aq)     

 

 

 

 

2)      I2(g)  +  KBr(aq)             

 

 

 

 

3)      Ca(s)  +  Mg(OH)2(aq)     

 

 

 

 

4)      Na(s)  +  CaI2(aq)     

 

 

 

 

5)      Cl2(s)  +  NaBr(aq)     

 

 

 

 

6)      Mg(g)  +  KI(aq)             

 

 

 

 

7)      Cu(s)  +  AgOH(aq)     

 

(copper here is copper (II) )

 

 

8)      Co(s)  +  Ni(NO3)2(aq)     

 

(cobalt here is cobalt (III) )

 

 

 

Worksheet: Redox Review

Oxidation-Reduction Review

1)    What does the acronym OIL RIG stand for?  Explain what that means.

 

 

2)    For each of the following redox reactions, show how many electrons are added, & on which side, and indicate whether oxidation or reduction has occurred.

 

a.         Ca2+    Ca                     _____________________

 

b.         O2-     O2                        _____________________

 

c.         Pb+2     Pb+4      _____________________

 

3)    Is the following a redox reaction?  (You do not need to balance this reaction). 

If no, write “No” and in one sentence say why not. 

If yes, write “Yes” and in one sentence say how you know that.

 

SO2  +  H2O    H2SO4 

 

 

 

4)    Consider the following reaction, and write the oxidation & reduction half reactions, and identify the oxidizing and reducing agents:

 

Ni+2(aq)  +  Cu(s)    Cu+2(aq)  +  Ni(s) 

 

oxidation:

 

reduction:

 

oxidizing agent:

reducing agent:

 

5)    Would the electrolysis of water be spontaneous or non-spontaneous?

 

 

6)    Write an equation illustrating that corrosion is an example of a redox reaction.  Show oxidation numbers for all atoms, stating which elements were oxidized and reduced.

 

 

_____________ was oxidized.            _____________ was reduced.

 

7)    Write an equation illustrating that combustion is a redox reaction.  Show oxidation numbers for all atoms, stating which elements were oxidized and reduced.

 

 

_____________ was oxidized.            _____________ was reduced.

 

8)    For the following diagram showing an electrochemical cell, correctly label:  

  1. the direction of electron flow
  2. the direction of cation flow across the salt bridge

 







 

 

 

 

 

 

 

 

 

 

 

 

 

Which metal bar is the anode?     ______________________

Which electrode (metal bar) is getting larger?     ______________________

What is happening to the concentration of copper ions?     _______________________________

Why do cations move in the direction you indicated above?

 

 

 

9)    Would an electrochemical cell (such as a battery) be spontaneous or non-spontaneous? 

 

 

 

10) Electroplating is an example of electrolysis.  Suppose you were goldplating a quarter (made from copper and zinc.  The quarter, suspended in the gold (II) nitrate solution, quickly becomes plated with gold.  Would the quarter be the anode or cathode?  Briefly explain how you know.

 

 

 

 

Layered Curriculum Unit: Redox, Chemical and Physical Changes, and Atomic Spectra

CHEMISTRY: Redox, Chemical and Physical Changes, and Atomic Spectra Unit

Basic Level: (Maximum of 70 points for this section.  Can move on with 65 points.)

1)    Listen to the Lecture; take notes (5 pts./day)                 Thurs   Fri   Mon   Tues

2)    ***REQUIRED: Redox Practice Worksheet (15 pts)

3)    Be able to identify the species oxidized, species reduced, oxidizing agent, and reducing agent for any redox reaction.  Also, be able to write the oxidation and reduction half reactions.  Your teacher will give you the rxn when you are ready. (20 pts)

4)    Do problem #22 on page 713.  Do it well. (15 pts)

5)    Read pg. 67-71 in the book.  Write a paragraph summary of what you learned. (15 pts)

6)    Make a colorful poster that shows the indicators of a chemical change.  Use pictures! (20 pts)

7)    Think of two classroom demonstrations that show a physical change and a chemical change.  Do them for the class. (15 pts)

8)    Do one or two of the green worksheets. (10 pts each)

9)    Do problems #21 and #25 on page 157.  (10 pts)

10) Make a poster that shows the Hydrogen atomic spectra.  Include an example of radiation absorption and radiation emission. (20 pts)

11) Give a speech to the class on why light is considered a particle and a wave.  (15 pts)

12) Write a song about redox reactions. (15 pts)

13) Write a story that includes at least 10 physical changes and 10 chemical changes. (20 pts)

 

Explore Level: (20pts)

1)    ***REQUIRED: What metals are the most reactive? (Activity Series Lab)

 

Rock Star Level (Choose one only – 10 pts)   Use Rock Star Assignment Sheet. 

1)    What brand of battery is the best?

2)    Redox reactions are very useful in the world around us, and are therefore very important to learn about.  However, are they too difficult for a high school chemistry class?  Why or why not?

3)    Is Albert Einstein the most brilliant scientist to ever have lived?