TABLE OF CONTENTS

(del) Open Source CA Textbook - Chemistry

OLD Unit 4: Gases and Their Properties

Unit 3: Conservation of Matter & Stoichiometry

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:

 

 

 

 

 

 

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