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Name!!
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Date
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Block
Lab: Redox Half-Reactions
Purpose: To determine the oxidation and reduction half-reactions for simple single-replacement
reactions.
Observations
Record your observations below (e.g., gas bubbles or turns black). If nothing occurs, write “No Rxn.”
1
ZnSO4
2
H2SO4
3
FeSO4
4
AgNO
5
CuSO4
6
MgSO4
A Zn
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
B Cu
C Mg
D Fe
Analysis
For each reaction that took place:
i. Write a complete and balanced chemical equation, including phases.
ii. Assign oxidation numbers for every element
iii. Write an the oxidation and reduction half-reactions, including phases.
Example
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Overall Rxn:!!
Ba(s) +
H2SO4(aq) ---->
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Oxidation numbers:!
0!
! Oxidation-half Rxn: !
Ba(s) ---->
! Reduction-half Rxn:!
+1 +6!-2!
2H+(aq) +
0! !
Ba2+(aq) +
2e- ---->
H2(g)
+
BaSO4(aq)
+2 +6
-2
2e-
H2(g)
1
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
2
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
3
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Rxn #
!
Overall Rxn:!!
!
Oxidation numbers:!
! Oxidation-half Rxn: !
! Reduction-half Rxn:!
Questions:
1. Which metal reacted with the largest number of solutions? ! !
! This metal is easily (circle choice):
oxidized or
2. Which metal was the least reactive? !
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reduced ?
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3. Which metal ion reacted with all metals? !
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! This ion is easily (circle choice):
or
oxidized
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reduced ?
4. Activity Series Determination: List the order of activity of the metals (those
most likely to undergo oxidation): Zn, Fe, Ag, Cu, and Mg.
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Most active ------------------------------------------> Least active
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