Electrolysis help Flashcards
1
Q
why cant we do carbon reduction on alluminum
A
aluminium is more reactive than carbon.
2
Q
Cryolite Formula
A
Na3AlF6
3
Q
whats cryolite used for
A
Dissolve AL2O3 to lower its working temperature so its more efficient and to save energy
4
Q
how does the electrolyte stay molten
A
Electrical heating effect of the current
5
Q
What are the electrodes made out of
A
- Copper
- Carbon in the form of graphite.
6
Q
What happens to hydrgien and oxygen
A
hydrogen: looses an electron to form H+ ions
Oxygen: Combines with H+ ions to form H2O
6
Q
WHat do hydrogen fuel cells do
A
use hydrogen and oxygen to produce electricity.
7
Q
Hydrogen fuel cell equation
A
Hydrogen + Oxygen = Water
2H2 (g) +O2 ( g) = 2H2O (l)
8
Q
Advantages of hydrogen fuel cells
A
- Water is the only product
- Produce more energy per gram of fuel burnt
- Very Efficient
9
Q
Disadvantages of hydorgen fuel cells
A
- High cost
- Manufacturing creates toxic by products
- Manufacturing requires fossil fuels.
