C4.3 Electrolysis Flashcards Preview

Chemistry > C4.3 Electrolysis > Flashcards

Flashcards in C4.3 Electrolysis Deck (21):
1

What is oxidation?

Loss of electrons

2

What is reduction?

Gain of electrons

3

What is the anode?

Positive electrode

4

What is the cathode?

Negative electrode

5

What is electrolyte?

An ionic substance which conducts electricity when molten or dissolved in water

6

What do metals ion attracted to?

They are positive and attracted to negative cathode- they undergo reduction

7

What are non-metals attracted to?

They are negatively charged and attracted to positive anode- they undergo oxidation

8

In the equation copper sulfato solution what would be produced at the negative electrode

At the cathode, copper would be produced as its ions are positive and opposites attract

9

In the equation copper sulfato solution what is produced at anode

At the positive electrode oxygen is produced as there’s no halogen available therefore oxygen is given off at positive electrode

10

What is produced at negative electrode in the equation of sodium sulfate solution

Hydrogen is produced instead of sodium as it’s more reactive than hydrogen

11

What is produced at positive electrode in the equation of sodium sulfate solution

Oxygen is produced as there’s no halogen available as it’s sulphur (sulphate) that’s available not chlorine (chloride)

12

What must copper be for electrical wiring

Pure- only by electrolysis

13

Disadvantage of electrolysis

Expensive due to large cost of electricity as a huge current is required for it to take place

14

What are insert electrodes

Electrodes that themselves are not involved in reaction

15

What is electrolysis

The breaking up of a substance using electricity

16

What must a substance be for electrolysis to happen

An electrolyte

17

What affects the mass of solid products and the volume of gas produced

The higher the current and the longer it’s flowing for, the greater amount of electrolysis products you’ll get

18

What is the half equation for reduction e.g. copper ions

2+ -
Cu +2e ->Cu

19

What is the half equation for reduction when hydrogen is involved (H-H (diatomic gas))

+ -
2H +2e ->H2

20

What is the half equation for oxidation e.g. chlorine ions

- -
2Cl -> Cl2 + 2e

21

What is the half equation for oxidation e.g. hydroxide equation

- -
4OH -> O2 + 2H2O + 4e