Electrolysis

Question 0

Electrolytes

Answer 0

Substances that conduct electricity when aqueous or molten

Question 1

When a solid is melted or dissolved in water

Answer 1

Ionic bonds are broken allowing free flow of ions

Question 2

Cathode

Answer 2

Negative

Attracts cations

Question 3

Anode

Answer 3

Positive

Attracts anions

Question 4

Reduction (electrolysis)

Answer 4

Positive ions gaining electrons

Question 5

Oxidation (electrolysis)

Answer 5

Electrons lost by negative ion

Question 6

Uses if sodium

Answer 6

Street lamps

Nuclear reactor coolant

Question 7

Producing hydrogen for fuel

Answer 7

Electrolyse water - hydrogen at cathode

Question 8

What happens to ions when a molten salt is electrolysed

Answer 8

They are discharged as atoms/molecules at electrodes

Question 9

Ions in salt water

Answer 9

Na+ Cl- H+ OH-

Question 10

What happens when salt water is ionised and why

Answer 10

H atoms easiest to discharge ,go to cathode
Chloride ions discharge easier at anode
Na and OH remain and form NaOH

Question 11

Products of electrolysis of slat water

Answer 11

H2 Cl2 NaOH

Question 12

Smelting

Answer 12

Heating an ore with carbon

Question 13

After smelting an ore

Answer 13

Mixture of metal and other elements remains

Purified/refined by electrolysis

Question 14

Electrolysis of copper

Answer 14

Impure used as anode ,pure used as cathode
Anode Lose 2 electrons each and become copper ions
They dissolve in solution and migrate to cathode forming pure copper
Impurities insoluble ->sludge(may contain silver/gold/platinum)

Question 15

Electroplating metal, what is plated

Answer 15

Cathode, and anode is pure metal

Question 16

Electroplating metals what happens

Answer 16

Electrodes placed in electrolyte of plating metal

At cathode ,positive metal ions reduced depositing an even layer of metal atoms

Question 17

Why electroplate

Answer 17

Aesthetics ,prevent corrosion