Electrolysis Flashcards

1
Q

What is electrolysis

A

Breakdown of molten or aqueous ionic compounds using electricity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Why do ionic compounds have to be aqueous or molten?

A

Ions are freely moving

They can carry electric charge

They are able to conduct electricity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Explain how in electrolysis of Lead bromide, bromide ions are converted to bromine gas.

A

Bromine ions are attracted to the anode

Electron is lost from bromide ion

Bromine ions are oxidised

Bromine becomes an atom

Two atoms of bromine make bromine gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is an electrolyte?

A

Substance that is broken down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Why is electrolysis used to extract some metals?

A

Used for metals that are more reactive than carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What substances are formed by electrolysis of a molten mixture

A

Cryolite and aluminium oxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe what is seen at each electrode during electrolysis of copper chloride

A

Positive: fizzing

Negative: pink/orange/red/brown solid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly