Unit 2 - Electrolysis Flashcards Preview

Chemistry Unit 2 + 3 > Unit 2 - Electrolysis > Flashcards

Flashcards in Unit 2 - Electrolysis Deck (17):
1

What is electrolysis

When you pass an electric current through an ionic substance that's molten/in solution and it breaks down into the elements it's made of

2

What is the electrolyte

The liquid required to conduct the electricity

3

What sort of ions do electrolytes contain?

Free ions

 

4

For an electrical circuit to be complete, what does there have to be?

A flow of electrons

5

Why do metals conduct electricity?

Because they have delocalised electrons which are free to carru charge through the solid structure

6

What happens in electrolysis?

When the solid is melted/dissolved the ions become free and move so that they can carry charge

7

What happens when the power supply is switched on?

The electrodes become positively and negatively charged

8

what ions are attracted to which electrodes?

Positive + ions are attracted to the negative electrode and negative - ions are attracted to the positive electrode

9

What happens to the ions at the negative electrode?

The positive ions gail electrons 

eg Na+ + e-  → Na

10

What happens to the ions at the positive electrode

The negative ions loose electrons

eg 2Cl-  → Cl2- + 2e

11

What are the equations involving electrons known as?

Half equations

12

What is the loss of electrons known as?

Oxidation

13

What is the gain of electrons known as?

reduction

14

what does OILRIG stand for?

Oxidation

Is

Loss

Reduction

Is

Gain

15

What substances form at the negative electrode?

Metals or hydrogen

16

What substances form at the positive electrode?

Non-metals, gases eg Cl2

17

When will salts conduct electricity?

When they're molten