C2.7 Electrolysis Flashcards Preview

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Flashcards in C2.7 Electrolysis Deck (14):
1

What is electrolysis

The separating of things using electricity

2

What happens at the positive electrode?

Negative ions lose their electrons to become charge less and are pulled with the current from the battery

3

What happens at the negative electrode?

Positive ions pick up electrons and become atoms again

4

What are cations?

Positively charged ions

5

What is the negative electrode called?

Cathode

6

What are negatively charged ions called

Anions

7

What is an anode

The positively charged electrode

8

What are Halides?

Chloride, Bromide, Fluoride, Iodide
(all above hydroxide)

9

What do non halides form at the anode?

Oxygen

10

What do halides form at the anode?

Halogens (any of the elements fluorine, chlorine, bromine, iodine, and astatine)

11

If the salt is more reactive than hydrogen will it produce hydrogen or the metal at the cathode?

Hydrogen

Potassium
Sodium
Magnesium
Aluminium
Carbon
Zinc
Iron
Tin
Lead

12

If the salt is less reactive than hydrogen will it produce hydrogen or the metal at the cathode?

The metal

Copper
Silver
Gold
Platinum

13

How can you use electrolysis to extract aluminium from aluminium oxide?

Dissolve bauxite to cryolite and heat until it melts as it melts at a lower temperature to bauxite.
The positive carbon electrode is placed in the solution where as the walls are negatively charged. These attract the positive aluminium which falls to the bottom and can be filtered off.
The carbon and oxygen form CO2
This is continuous, although the carbon electrode needs to be replaced.

14

How can you use electrolysis in metal plating?

The object you want plated is placed