Electrolysis

Question 1

Give the metals in order of their reactivity series

Answer 1

Potassium
Sodium
Calcium
Magnesium
Aluminium
Carbon
Zinc
Iron
Tin
Lead
Hydrogen
Copper
Silver
Gold
Platinium

Question 2

What are Gold and Silver called

Answer 2

Native metals

Occur in the earth’s crust as the metal itself

Question 3

The extraction of a metal from it’s ore often involves removing………….from it’s ore
This is known as………….

Answer 3

Oxygen

Reduction

Question 4

How can reduction tae place

Answer 4

By reacting the ore with a more reactive element in a DISPLACEMENT reaction

Question 5

What is the reducing agent

Answer 5

Substance which reduces something else

Question 6

Why is electrolysis used

Answer 6

Extraction of metals above Carbon in the reactivity series can not be obtained by reduction using Carbon
Instead these metals are extracted using electricity

Question 7

Al2O3 has a very high melting point so it is dissolved in……………….so that it has a lower melting point (…….˚C)

Answer 7

Molten Cryolite

1000˚C

Question 8

In industry the metals are extracted from their ores by:
………………if the metal is more reactive than Carbon
………………if the metal is less reactive than Carbon

Answer 8

Electrolysis

Displacement

Question 9

Electrolysis is the break down of an………………….using electricity

Answer 9

Ionic substance

Question 10

……..move to the electrode

…………form at the electrodes

Answer 10

Ions

Elements

Question 11

Is the anode negative or positive

Answer 11

Positive

Question 12

In electrolysis does the metal go to the anode or cathode

Answer 12

Cathode = negative 
Metals = positive

Question 13

Give the equation that happens at the cathode and anode for the electrolysis of Lead Bromide

Answer 13

Pb(2+) +2e(-) = Pb

2Br(-) = Br2 +2e(-) Bubbles of orange vapour

Question 14

In metallic conduction, the current is carried by the…………………….

Answer 14

Flow of electrons

Question 15

In Electrolysis, current is carried by…………………….
Charged particles move in……………….
there is a chemical reaction at the electrodes, the ions become……………

Answer 15

Ions being able to move
Both directions
Elements

Question 16

What is oxidation

Answer 16

When a substance gains oxygen

Question 17

What is reduction

Answer 17

When a substance looses oxygen

Question 18

Give the half equation that happens at the anode and cathode for CuCl2

Answer 18

Anode:
Cl2(-) = Cl2 +2e(-)

Cathode:
Cu(2+) + 2e(-) = Cu

Question 19

Which elements travel in pairs

Answer 19

Hydrogen, (N2) Nitrogen, (O2) Oxygen, (F2) Fluorine, (Cl2) Chlorine, (I2) Iodine and (Br2) Bromine.

Now Order a Fresh Cold Beer Immediately

Question 20

When ions are in solution they can also move and be electrolysed but the presence of…………can change the expected products

Answer 20

Water

Question 21

Give the chemical equation for water

Answer 21

H2O ⇄ H(+) + OH(-)

Question 22

Give the equation for water in electrolysis

Answer 22

4OH(-) = 2H2O +O2 +4e(-)

Question 23

In solutions, give the rule on wether the metal or hydrogen reacts

Answer 23

If the metal is less reactive than the hydrogen, then the hydrogen reacts at the cathode

Question 24

In solutions, give the rule on wether OH or ion reacts

Answer 24

If it is a halide ion than it will react at the anode instead of OH

Question 25

Give the test for halogens

Answer 25

Bleaches litmus paper