Electrolysis

Question 1

What is electrolysis?

Answer 1

This is a chemical change caused by passing an electric current through an ionic compound which is either molten or solution

Question 2

What is the anode?

Answer 2

The positively charged electrode

Question 3

What is the cathode?

Answer 3

This is the negatively charged electrode

Question 4

What is an electrolyte?

Answer 4

This is a liquid which conducts electricity. It can be a molten ionic compound or an ionic substance dissolved in water (aqueous solution). In both case the ions are free to move about and so are able to conduct electricity

Question 5

What are electrodes?

Answer 5

These conduct electricity and are dipped in the electrolyte. They are called the anode and cathode

Question 6

Which ions are attracted towards the negative cathode?

Answer 6

Positive metal ions and hydrogen ions

Question 7

Which ions are attracted towards the + anode?

Answer 7

Negative non-metal ions

Question 8

Explain what happens when lead bromide is electrolysed

1) cathode
2) anode

Answer 8

1) The Pb2+ will move to the cathode

The Br- will move to the anode

Question 9

What does OILRIG stand for?

Answer 9

Oxidation
Is the
Loss of electrons
Reduction
Is the
Gain of electrons

Question 10

What is the test for chlorine?

Answer 10

Blue litmus paper turns red then white

Question 11

What does ‘-‘ mean after a letter or number?

Answer 11

It has too many electrons/needs to get rid of some

Question 12

What does ‘+’ mean after a letter or number?

Answer 12

Doesn’t have enough electrons/needs more

Question 13

What is the test for hydrogen?

Answer 13

A lighted spill goes out with a squeaky pop

Question 14

What is the test for chlorine?

Answer 14

Chlorine turns litmus paper red the white unite