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Chemistry > ELECTROLYSIS > Flashcards

ELECTROLYSIS Flashcards

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1
Q

electrolysis

A

electrolysis is the process of splitting a compound by passing electricity

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2
Q

electrolyte

A

is a liquid that has ions and conduct electricity

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3
Q

electrode

A

a piece of metal through which carbon the current enters and leaves the elctrolyte

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4
Q

inert electrodes

A

electrodes that doesnt interfere with the products of elctrolysis

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5
Q

eg of inert electrode

A

graphite and platinum

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6
Q

electrons carry current through

A

wires

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7
Q

Ions carry current through

A

electrolytes

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8
Q

The molten lead Bromide contains

A

Pb+ and Br-

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9
Q

Lead Bromide =

A

lead + Bromide

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10
Q

Ions attract

A

electrodes of opposite charges

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11
Q

At Cathode — occures

A

reduction

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12
Q

At Anode— occures

A

oxidation

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13
Q

Observation for electrolysis of molten lead bromide

A

Silver like droplets at Cathode, Reddish vapors @ Anode

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14
Q

Reaction of electrolysis of molten lead bromide at Cathode

A

Pb2+2e= Pb

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15
Q

Reaction of electrolysis of molten lead bromide at Anode

A

2Br= Br2+2e

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16
Q

In Electrolysis of a solution what forms at cathode

A

Metal or Hydrogen forms

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17
Q

In Electrolysis of a solution what forms at Anode

A

Non metal other than hydrogen forms. If dilute Oxygen forms.

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18
Q

Oxidation

A

Loosing of electrons

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19
Q

Reduction

A

Gaining of electrons

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20
Q

Reaction of concentrated solution of Aq Sodium Chloride at Anode

A

2Cl= Cl2+2e

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21
Q

Reaction of concentrated solution of Aq Sodium Chloride at Cathode

A

2H +2e= H2

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22
Q

Products of concentrated solution of Aq Sodium Chloride

A 
Anode = Hydrogen gas.
Cathode = Chlorine Gas
23
Q

Reaction of dilute solution of Aq Sodium Chloride at Anode

A

4OH= O2+2H2O+4e

24
Q

Reaction of dilute solution of Aq Sodium Chloride at Cathode

A

4H+4e= 2H2

25
Q

What is Brine

A

Concentrated Sodium Chloride

26
Q

Equation of electrolysis of Brine

A

2NaCl + 2H2O = 2 Na(OH)+CL2+H2

27
Q

reaction of cathode electrolysis of Brine

A

2H+2e=H2

28
Q

reaction of Anoode electrolysis of Brine

A

2Cl= Cl2+2e

29
Q

products of electrolysis of Brine

A

Chlorine, Hydrogen, Sodium Hydroxide

30
Q

use of chlorine

A

use for drinking water purification

31
Q

use of hydgrogen

A

use for making fuel & manufacture of Amonia

32
Q

Use of Sodium Hydroxide

A

use for making soaps.

33
Q

Reaction at Cathode for electrolysis of Copper Sulfate at Cathode Carbon

A

CO2+2e= Cu

34
Q

Reaction at Anode for electrolysis of Copper Sulfate at Anode Carbon

A

4OH=2H2O + O2+4e

35
Q

Products of electrolysis of copper sulfate

A

Anode - Bubbles of colorless gas

Cathode - Reddish Brown Salt

36
Q

observation at electrolysis of copper sulfate carbon

A

the electrolyte turns from blue to colorless

37
Q

reaction at anode in electrolysis of copper sulfate copper

A

40h=2h2o+02+4e

38
Q

why does the size and weight of copper anode decrease

A

because the oxygen formed at anode reacts with the copper electrode and forms copper oxide which goes in water and makes it concentrates

39
Q

reaction at cathode

A

cu2 + 2e=Cu

40
Q

product at anode

A

as copper is formed it makes the anode size bigger and due to this the electrolysis remains the same

41
Q

in purification of metals cathode

A

pure metal

42
Q

in purification of metals cathode anode

A

impure metal

43
Q

in purification of metals electrolyte

A

copper sulphate or nitrate

44
Q

electroplating cathode

A

object to be electroplated

45
Q

electroplating anode

A

metal to be coated on the object

46
Q

uses of electroplating

A
  1. makes it attractive

2. prevents corrosion

47
Q

ore of Al what does it contain

A

bauxite contains Al2O3

48
Q

How is aluminium extracted

A

it is extracted by the electrolysis of aluminium oxide in molten cyolite

49
Q

role of cryolite

A

reduce the melting point.increases electrical conductivity.acts as a solvent

50
Q

aluminium extraction is conducted in

A

steel tank with graphite

51
Q

aluminium extraction cathode

A

graphite lining acts as a cathode

52
Q

aluminium extraction anode

A

anode is a group of electrodes dipped into the electrolyte

53
Q

aluminium extraction cathode

A

Al3+3e=Al

54
Q

aluminium extraction anode

A

2o2=o2=4e

Chemistry (7 decks)

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