Download Chapter 20 Worksheet 28

Chapter 20 Worksheet 28
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Prina
Chem 178
Dr. Meyer
04/21/2015
1) For the reaction MnO−4(aq)+I−(aq)→Mn2+(aq)+ I2(s)
What species is getting oxidized:
Identify the reducing agent:
Identify the oxidizing agent:
reduced:
2) Revision on oxidation number:
1.The oxidation number of any uncombined element is ______________.
2. The oxidation number of a monatomic ion equals the charge on the ion.
3. The oxidation number of fluorine in a compound is always ______________.
5. Oxygen has an oxidation number of ___ unless it is in a peroxide (such as H2O2), when it
is_______
6. The oxidation state of hydrogen in most of its compounds is +1 unless it is combined with a metal,
in which case it is -1.
7. In compounds, the elements of groups 1 and 2 as well as aluminum have oxidation numbers of +1,
+2, and +3 respectively.
8. The sum of the oxidation numbers of all atoms in a neutrals compound is ___________.
9. The sum of the oxidation numbers of all atoms in a polyatomic ion equals the charge of the ion.
Assign oxidation number to the following compounds:
3)
Mn in KMnO4
N in NO2-
S in H2SO4
I in Mg(IO3)2
Balancing equations:
MnO−4(aq)+I−(aq)→Mn2+(aq)+ I2(s)
[In acidic aqueous solution]
Two half reactions:
Balancing oxidation half:
Balancing reduction half:
Overall reaction:
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