Chemistry (Chapter 14)- Electrolysis

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1

Why can ionic compounds only be electrolyzed when there are in a molten state?

Because the ions are free to move about and carry a charge

2

The ion move towards ________ charged electrodes

oppositely

3

At the cathode, postively charged ions....

gain electrons (reduction)

4

At the anode, negatively charged ions

lose electrons (oxidization)

5

Use lead as an example of an ionic half equation that occurs in the cathode (-)

Pb2+ +2e -> Pb

6

Use bromine as an example of an ionic half equation that occurs in the anode(+)

2Br- -2e->Br2

7

If a mixture of ions are present, the products formed at the cathode depend on....

The reactivity of the ions
(The less reactive, the more likely it is a product)

8

If a mixture of ions are present, the products formed at the anode depend on.

Relative concentration of the ions present
(The higher the concentration, the more likely it is a product)

9

Explain the process of the electrolysis of aluminium

-Aluminum oxide from bauxite is extracted
-Cryolite is mixed with aluminum oxide to lower the boiling point
-Aluminium forms at the anode
-Oxygen forms at the cathode

10

What are the products of electrolyzing brine and name some uses for them

-Chlorine (Disinfectant)
-Hydrogen (Making margarine)
-Sodium Hydroxide (Bleaches and soaps)

11

Why do we electroplate objects?

-Improve their appearance
-Protection
-Ue smaller amounts of precious metals

12

How does electroplating work?

-The object to be electroplated is made in the cathode
-The planting metal is made at the anode