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Chapter 19 pre-reading

Short Answer
 

 1. 

What is an oxidation state?   (you may need to look in a different area of your text to get this answer)
 

 2. 

All neutral elements have an oxidation state of?
 

 3. 

When sodium is oxidized from elemental sodium how does its oxidation state change?
 

 4. 

How do you know if a reaction is an oxidation reduction reaction?
 

 5. 

Notice on page 594, there is an example of a reaction between NaCl and AgNO3 to produce NaNO3 and AgCl.  Does the book describe this reaction as a redox reaction?  If not, look and see why,   Complete question number 3 on the following page 595.  Simply type in the oxidation numbers for each element in order they are listed and they indicate if the reaction is a redox reaction.  (Complete a-e.  You will need to be able to determine oxidation reactions with ease.  The sooner you start the sooner you will get to that point.  Make it happen. )
 

 6. 

Balancing oxidation reduction reactions is very important and is not sufficient to just be familiar with it.  You need to master this process so that during a multiple choice problem set you can fly through them.  This book provides one way to balance these reaction.  This method works but I like a different method better.  The method given at this web site shows how I will be explaining it in class. Go to this site and study this method. 

http://wiki.answers.com/Q/How_do_you_balance_a_reduction-oxidation_or_redox_reaction

Balance the two reactions
1.  Cu + AgNO3 Þ Cu(NO3)+  Ag


2.  Cr2O72- + H2C2O4 -->  Cr3+ +  CO2
 

 7. 

Why is the fluorine atom the strongest oxidizing agent yet the fluorine atom is the weakest reducing agent?
 

 8. 

What is the oxidation state of each oxygen atom in peroxide and what are the two options of oxidation states that the oxygen might convert to.
 

 9. 

When building a chemical reaction what reaction occurs at the anode and what reaction occurs at the cathode?
 

 10. 

Look at the pictures on page 607 and 608, which way do electrons flow? 
-  anode to cathode
or
- cathode to anode
 

 11. 

What is electroplating?
 

 12. 

Define voltage.
 

 13. 

How much an electrode (anode/cathode) want or don’t want electrons is referred to ______________  sometimes symbolized as E.
 

 14. 

Looking at the chart from page 615 (Standard Reduction potentials), how do you find the potential for an oxidation reaction?  The chart only shows reduction.
 



 
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