Chem 12- Redox

What is electrochemistry?

What does it have to have?
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What is electrochemistry?

What does it have to have?
changing from chemical PE to electric PE and back

half cell reducing
half cell oxidizing
What are the 4 applications of electrochemistry in real life?
breathalyzer
lead car batteries
hydrogen fuel cells in cars
oxidation of metals (corrosion)
What is the reaction for a lead car battery expierencing electrochem?

can this reaction go in both directions?
Pb + PbO4 (leadoxide) + HSO4 (sulfiric acid)+ 2H ------->
PbSO4 (leadsulfate) + 2H2O

Yes
How does a breathalyzer work?

What color will this change the breathalyzer when this ocurs
(causing a color change from yellow to gree-blue.)

-Ethyl oxidizes with potassium dichromate
forming acetic acid
What is a hydrogen fuel cell?
combines hydrogen and oxygen to produce electricity, heat, and water.
How does metal oxidize? aka?
corrosion
a metal and oxygen will force the metal to oxidize when H2O is present
What 3 ways can we prevent corrosion?

Define these 3 options
(galvanizing) Enviormental- apply paint/ another metal overtop so the O2 can contact that one instead

Cathodic- attach a stronger oxidizer metal so O2 will favour that metal more

Voltage- apply a low voltage to the metal(s) so the metal and O2 can be at equilibrium so no ions are made
What is an Anode?
What is a cathode?
where oxidation occurs

where reduction occurs
What direction do electrons flow in an electrochemical cell?

through what?
from anode(oxidation) to cathode (reduction)

a wire
Where do anions go to an electrochemical cell?

Where do cations go to an electrochemical cell?
anions (-) will go to the anode (oxidation)

cations (+) will go to the cathode (reduction)