Brainscape's Knowledge GenomeTM

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


See full index

old GCSE Chemistry > electrolysis > Flashcards

electrolysis 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

define electrolysis

A

when electric current is used to break down a compound that is made of ions into simpler substances.

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

what is the positive electrode called?

A

the anode

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

what is the negative electrode called?

A

the cathode

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

give 2 examples of materials that could be used to make electrodes and explain why they are used

A
  • graphite or platinum

- these are unreactive materials which will not react with the electrolyte/products formed during electrolysis.

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

define the electrolyte

A

what will be electrolysed

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

which electrode are
1. cations
2. anions
attracted to?

A
  1. cations are attracted to the cathode

2. anions are attracted to the anode.

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

why must ionic substances be molten in order to be electrolysed?

A

so that the ionic lattice is broken down and the ions are free to move and carry the charge.

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

what happens to the ions at the electrodes?

A

they become discharged

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

does reduction or oxidation happen at the cathode and why?

A

reduction happens at the cathode as the positive ions gain electrons.

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

does reduction or oxidation happen at the anode?

A

oxidation happens at the anode as the ions lose electrons.

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

what does NILE PIG stand for?

A

negative ions lose electrons, positive ions gain.

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

write an ionic equation to show how sodium is discharged

A

Na+1 + e- –> Na

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

write an ionic equation to show how chlorine is discharged.

A

2Cl-1 -> Cl2 + 2e-

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

give the ionic equation for the discharge of hydrogen

A

2H+ + 2e- -> H2

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

give the ionic equation for the discharge of hydroxide ions

A

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

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

how is the order of discharge decided at the CATHODE?

A
  • the least reactive ion is discharged

- hydrogen is less reactive than lead but more reactive than copper, silver, gold.

17
Q

name the order of discharge at the ANODE

A 
carbonate (stay in solution)
nitrate (stay in solution)
sulphate (stay in solution)
HYDROXIDE, from water
chloride (discharged)
bromide (discharged)
iodide (discharged)

old GCSE Chemistry (34 decks)

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