Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

GCSE Chemistry > C6 > Flashcards

C6 Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards GCSE Religious Studies - Edexcel Route A flashcards GCSE Religious Studies - Eduqas Route A flashcards GCSE Geography - AQA flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards GCSE Religious Studies - Edexcel Route B flashcards GCSE Religious Studies - Eduqas Route B flashcards
1
Q

What is electrolysis?

A

Splitting up with electricity

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

What happens during electrolysis?

A

An electric current is passed through an electrolyte. The ions move towards the electrodes , where they react , and the compound decomposes.

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

What is an electrolyte

A

A molten or dissolved ionic compound

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

What moves towards the anode?

A

Negative ions which will lose electrons. And so it will be oxidised

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

What is the positive electrode?

A

Anode

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

What is the negative electrode ?

A

Cathode

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

What moves towards the cathode ?

A

Positive ions , which will gain electrons and will be reduced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What happens to the ions when an ionic compound is melted or dissolved?

A

Ions are free to move in the liquid or solution. These liquid solutions are able to conduct electricity and are called electrolytes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What happens during the process of electrolysis?

A

Electrical current passes through electrolytes Causing the ions to move to the electrodes. Positively charged ions move to the negative electrode(cathode) and negatively charged ions move to positive electrode(anode). Ions are discharged at the electrodes producing elements. This is electroylsisn

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What happens when a simple ionic compound is electrolysed?

A

The molten state using inerrt electrolydes , the metal is produced at the cathode and the non metal is produced at the anode. For example lead bromide, lead (metal ) will be produced at the cathode and bromine (non metal ) is produced at the anode.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Why cant an ionic solid be electrolysed?

A

Ions are in a fixed position and cant move

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Why can molten ionic compounds be electrolysed?

A

Ions are free to move and conduct electricity .

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What type of metal can be extracted by electrolysis?

A

A metal more reactive than carbon. It cant be extracted by reduction with carbon or if metals react with carbon.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Problems with electrolysis as a method of extractions?

A

Very expensive and Required a lot of energy are used in extraction process to melt compounds and to produce the electrical current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How is aluminium extracted ?

A

From the ore bauxite by electrolysis. Bauxite contains aluminium oxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why is aluminium mixed with cryolite

A

Has a very high melting point so is mixed with cryolite to lower the melting point

17
Q

What happens when you separate aluminum oxide by electrolysis ?

A

Molten mixture contains free ions -so will conduct electricity.positive Al3+ ions are attracted to the negative electrode where they each pick up three electrons and turn into neutral aluminium atoms. These sink to the bottom of the electrolysis tank. Negative O2- ions are attracted to the positive electrode where they each lose 2 electrons. They will form O2 molecules.

18
Q

What is produced at the positive electrode when aluminium oxide is electrolysed?

A

Oxygen

19
Q

What is the anode made from ?

A

Carbon

20
Q

Why does the anode need to be replaced?

A

Reacts with oxygen to form carbon dioxide

21
Q

What is produced at the negative electrode when aluminum oxide is electrolysed ?

A

Aluminum

22
Q

Why do metals attract to the negative electrode?(cathode)

A

Metals form positive ions so they are attracted to it.

23
Q

What reaction happens at the negative electrode?(cathode)

A

Reduction

24
Q

What type of reaction happens at the positive electrode?(anode)

A

Oxidation

25
Q

What is the reduction ionic equation at the cathode?

A

AL3+ 3e- —> AL

26
Q

What is the oxidation equation at the anode?

A

2O2- —-> O2 + 4e-

27
Q

What is the overall iequation for electrolysis of aluminium oxide?

A

Aluminium oxide —> aluminium +oxygen

28
Q

Difference between an electrode and electrolyte?

A

Electrode is a solid that can conduct electrcity qnr the electrolyte is a liquid that can.

29
Q

What happens when an aqueous solution is electrolysed using inert electrodes?

A

Ions are discharged

30
Q

What effects the ions discharged during electrolysis?

A

Relative reactivity of its elements involved .

31
Q

What is produced at the cathode if a metal is more reactive than hydrogen?

A

Hydrogen

32
Q

What gas is produced at the anode?

A

Oxygen is produced unless the sodium contains halide ions and hydroxide ions when the halogen in produced

33
Q

What happens when an aqueous solution of water molecules break down?

A

Produces hydrogen ions and hydroxide ions that are discharged .

34
Q

What type of reaction is happening at the cathode?

A

Positively charged ions gain electrons and so the reaction is reduction.

35
Q

What type of reaction happens at the anode?

A

Negatively charged ions lose electrons and so the reactions are oxidation.

GCSE Chemistry (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions