Oxidation States
Redox Reactions
Half Reactions
Electrochemical Cells
Activity Series
100
Where can you find the most common oxidation states of elements?
Periodic Table/Chemistry Reference Sheet
100
The number of electrons lost is always equal to what in a redox reaction?
It is always equal to the number of electrons gained
100
What is lost or gained in any redox half reaction.
Electrons
100
The reactions in a Voltaic/Galvanic Cell are what?
Spontaneous
100
For anything dealing with activity in elements, which table is your best friend?
Hint: Not the periodic table
Table J
200
What is Oxidation a fancy word for?
Charge
200
Name one way to remember the difference between Oxidization and Reduction?
Oil Rig (So long as you provided the way you remember that works best for you, you got the point)
Oil (Oxidization is losing) Rig (Reduction is gaining)
200
What about charge must you keep in mind when writing the half reactions?
Conservation of charge
200
What must a Electrolytic Cell have in order to be considered Electrolytic?
A battery, or some sort of external power source.
200
Why does Li bond with Cl even though it was already bonded with K in the following reaction?
Li + KCl --> LiCl + K
Li is more reactive than K
300
What is the oxidation number of H in NaH?
-1
300
Is the following reaction a redox reaction?
Br2 + 2KI --> 2KBr + I2
Yes, the oxidization of both I & Br change
300
In a reduction half reaction, on which side of the equation are the electrons found?
Electrons are found on the reactant side in reduction
300
FIlLL IN FOR (A) AND (B)
In an Electrolytic Cell, __(A)__ energy is converted into __(B)__ energy.
A- Electrical
B- Chemical
Completed: In an Electrolytic Cell, Electrical energy is converted into Chemical Energy.
300
Define a Spontaneous Reaction
If you said anything along these lines you get a point: A reaction that will continue on it's own once triggered and favors formation of products in relatively normal conditions.
400
What oxidation state is Cl in in the following formula:
Cl2O
+1
(Sometimes certain common oxidation states can be overruled)
400
Which element in the following redox reaction is oxidized?
Cu2+ + Mg --> Cu + Mg2+
Mg/Magnesium
400
Is the following half reaction Oxidation or Reduction?
Fe --> Fe2+ + 2e-
Oxidation
400
In which Cell, Voltaic/Galvanic or Electrolytic, is the Anode Negative?
In Voltaic Cells, the Anode is the negative electrode
Voltaic/Galvanic: -Anode & +Cathode
Electrolytic: +Anode & -Cathode
400
Is the following reaction likely to occur spontaneously:
Co + Zn(NO3)2 --> Co(NO3)2 + Zn
No, because Zn is more reactive than Co
500
What causes elements to undergo oxidization number changes in the first place?
Hint: Think in simple terms
Differences in Electronegativity and completing their valence octet. (Trying to achieve noble gas configuration)
500
Is the following reaction a redox reaction?
AgNO3 + NaCl --> NaNO3 + AgCl
No, it isn't. There is no change in oxidation for any element.
500
Write the reduction half reaction for:
Zn + Cu2+ --> Zn2+ + Cu
Cu2+ + 2e- --> Cu
500
QA: What is missing from this Voltaic/Galvanic Cell?
QB: What purpose does this missing item serve?
QC: Which direction, in terms of SPECIFIC electrodes, do electrons flow through the wire.
A: Salt Bridge
B: To allow Ions to flow, which, in turn, maintains electrical neutrality in both half cells
C: Electrons flow through the wire from the Ni Anode into the Cu Cathode.
500
Using Table J, write a synthesis reaction that produces the strongest ionic bonds
2Li + F2 --> 2LiF