Electrolysis

Question 0

Positive electrode

Answer 0

Anode

Question 1

Negative electrode

Answer 1

Cathode

Question 2

How can solid ionic substances be changed to conduct electricity?

Answer 2

Dissolving them in a solution or melting them to their molten state so that the ions can move freely and carry charge

Question 3

OIL RIG

Answer 3

Oxidation is loss

Reduction is gain

Question 4

Rules of electrolysis

Answer 4

The substance made at the electrode is:

• a halide
• hydroxide
• lower in the reactivity series

Question 5

Half equations

Answer 5

Take the ionic substance back to its neutral state by either gaining or losing electrons again

Question 6

What are group 7 elements?

Answer 6

Halides

Question 7

Which electrons are attracted to the cathode?

Answer 7

Positive ions

Question 8

Which electrons are attracted to the anode?

Answer 8

Negative ions

Question 9

What is the molten mixture involved in the electrolysis of aluminium?

Answer 9

Aluminium oxide (alumina) and cryolite

Question 10

Why is cryolite used in the electrolysis of aluminium?

Answer 10

To lower the melting point of aluminium from 2000’c to 850’c so that less energy is involved in the process is therefore cheaper

Question 11

What is electroplating?

Answer 11

Depositing one metal onto another metal.

Question 12

What happens at the cathode in electroplating?

Answer 12

The metal gains electrons and goes back to its neutral state.
It deposits on the other metal.

Question 13

What happens at the anode in electroplating?

Answer 13

The metal loses electrons

It starts to dissolve in the solution.

Question 14

How many things are in an melted ionic compound?

Answer 14

2

Question 15

How many things are in a aqueous solution for electrolysis?

Answer 15

4

Question 16

Define electrolysis

Answer 16

Splitting up substances using electricity

Question 17

Define Electrolyte

Answer 17

Substance which conducts and is chemically charged by the current
Usually a melted or dissolved ionic compound

Question 18

Explain briefly the electrolysis of melted ionic compounds

Answer 18

You are getting the original element from its ion, in its neutral state.

Question 19

In an aqueous solution what ions from water are present?

Answer 19

Hydrogen and hydroxide

Question 20

Overall Equation for electrolysis of aluminium

Answer 20

2Al2 O3= 4Al + 3O2

Question 21

What is the positive electrode made of in the electrolysis of aluminium?

Answer 21

Carbon

Question 22

Why does the positive electrode deteriorate in the electrolysis of aluminium?

Answer 22

The carbon reacts with the oxygen and then burns away in the CO2 created

Question 23

Properties of aluminium

Answer 23

Light and strong

Question 24

What is the word that describes when atoms travel in pairs?

Answer 24

Diatomic

Question 25

Name three diatomic elements

Answer 25

O2, Br2, Cl2

Question 26

Why can electroplating be expensive?

Answer 26

There is a lot of electricity involved and the substances in it can also be expensive to get,

Question 27

Where is the object to be plated always? It's an electrode

Answer 27

Cathode

Question 28

Where is the plating metal always found?

Answer 28

Anode