Electrolysis Flashcards Preview

GCSE Chemisty*** > Electrolysis > Flashcards

Flashcards in Electrolysis Deck (16):
1

What is Electrolysis used to make

New substances

2

What is Electrolysis

When you pass an electric current through an ionic substance which is molten or in solution which breaks into new substances

3

What is an electrolyte

The liquid that conducts electricity

4

What happens at the anode

Electrons are taken away from the ions

5

What happens at the cathode

Electrons are given to the ions

6

Which is the positive electrode

Anode

7

Which is the negative electrode

Cathode

8

What happens at the cathode when it is in aqueous solution

Hydrogen gas will be produced if the metal ions a more reactive than Hydrogen ions

If the metal is less reactive the hydrogen then the metal will be produced

9

What happened to the anode in aqueous solution

If halide ions are present the halogen is formed

If no halide ions are present then oxygen and water will form

10

What does the amount of product made depend on

The number of electrons that are transferred

11

How do you increase the amount of substance produced

- Electrolysing for a longer time
- Increasing the current

12

Relationship between Charge, current and time

Charge= current x time

13

What does one Faraday equal

96,000 coulombs

14

What does one faraday contain

One mole of electrons

15

How do you find the mass produced during electrolysis

1) write out the balance half equation
2) Calculate the number faradays
3) divide the number of faradays by the number of electrons in the half equation
= moles
4) use mass = moles x Mr

16

How do you calculate the number faradays

- charge = current x time
= x columbs
- x ÷96000
= y faraday