Redox theory
Galvanic cells (primary)
Fuel cells
Mixed Redox
Wild Card
100
To balance complex redox equations, which atoms should be balanced first?
All atoms other than oxygen and hydrogen
100
At what electrode does reduction occur in a galvanic cell?
cathode
100
What is the energy conversion that occurs in a fuel cell?
chemical to electrical
100
Are the reactions that occur in galvanic cells spontaneous or non-spontaneous?
spontaneous
100
How much does a 1st year teacher get paid in Victoria?
How much does a 1st year teacher get paid in NSW?
$79 589
$90,177
200
Where on the electrochemical series would you find the strongest oxidant?
top left hand corner
200
What is the polarity of the anode in a galvanic cell?
negative
200
How do you balance a carbonate fuel cell?
Balance the C, then H normally, then balance the oxygens with CO3- on one side and add an equal amount of CO2 on the other side
200
How would you balance for a SOFC
Balance the oxygens using O2-
200
What is the spell to levitate in Harry Potter
Wingardium levi-OOOOOsa
300
What is the oxidation number of S in H2SO4?
+6
300
Explain the function of a salt bridge
provides negative and positive charged ions that can migrate into half cells to balance the charge. Without a salt bridge, a galvanic cell will cease to operate.
300
Hydrogen fuel cells can be used to power cars. What disadvantages are there in the use of hydrogen as a fuel?
Safety and cost of storage and transport (explosive, very light gas must be pressurised or liquefied)
300
Write the half equations for the acode and cathode
300
How many Tim Tam packets tall is Ms Tenedora?
Hint: a Tim Tam packet is 220mm long
7 tim tam packets (according to chatgpt)
400
Define oxidant, and what reaction does it undergo?
Hint: is it always a product or reactant?
- an oxidant (or oxidizing agent) is defined as a reactant that removes electrons from another species and gets reduced in the process
400
How is the potential voltage of a galvanic cell calculated?
cell potential difference = E0 of half-cell containing oxidant - E0 of half-cell containing reductant
400
Why are porous electrodes used in fuel cells?
Increase surface area to maximise rate of reaction
400
The > indicates the flow of O2-. Identify the:
-anode
- cathode
- direction of flow of e-
400
Name this pokemon:
Ekans
500
Solid Mg (s) is placed in an aqueous Al(NO3)3 solution. Describe two observations that can either be measured or seen.
- Mg(s) decrease in size/mass
-H2 gas produced
500
Explain how standard electrode potentials (Eo values) are obtained.
By combining half-cells with the standard hydrogen half-cell.
500
Explain the function of the electrolyte in a fuel cell
Allows the transfer of ions participating in the reaction from one electrode to another
500
Write thehalf equations for the cathode and anode
cathode: 2H+(aq)+2e–→H2(g)
anode: Zn(s)→Zn2+(aq)+2e–
500
In 1932, the Australian army was sent to WA with machine guns to fight a war. Who was the war against?
Emus