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ELECTROLYSIS Flashcards

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
What is Brine
Concentrated Sodium Chloride
26
Equation of electrolysis of Brine
2NaCl + 2H2O = 2 Na(OH)+CL2+H2
27
reaction of cathode electrolysis of Brine
2H+2e=H2
28
reaction of Anoode electrolysis of Brine
2Cl= Cl2+2e
29
products of electrolysis of Brine
Chlorine, Hydrogen, Sodium Hydroxide
30
use of chlorine
use for drinking water purification
31
use of hydgrogen
use for making fuel & manufacture of Amonia
32
Use of Sodium Hydroxide
use for making soaps.
33
Reaction at Cathode for electrolysis of Copper Sulfate at Cathode Carbon
CO2+2e= Cu
34
Reaction at Anode for electrolysis of Copper Sulfate at Anode Carbon
4OH=2H2O + O2+4e
35
Products of electrolysis of copper sulfate
Anode - Bubbles of colorless gas | Cathode - Reddish Brown Salt
36
observation at electrolysis of copper sulfate carbon
the electrolyte turns from blue to colorless
37
reaction at anode in electrolysis of copper sulfate copper
40h=2h2o+02+4e
38
why does the size and weight of copper anode decrease
because the oxygen formed at anode reacts with the copper electrode and forms copper oxide which goes in water and makes it concentrates
39
reaction at cathode
cu2 + 2e=Cu
40
product at anode
as copper is formed it makes the anode size bigger and due to this the electrolysis remains the same
41
in purification of metals cathode
pure metal
42
in purification of metals cathode anode
impure metal
43
in purification of metals electrolyte
copper sulphate or nitrate
44
electroplating cathode
object to be electroplated
45
electroplating anode
metal to be coated on the object
46
uses of electroplating
1. makes it attractive | 2. prevents corrosion
47
ore of Al what does it contain
bauxite contains Al2O3
48
How is aluminium extracted
it is extracted by the electrolysis of aluminium oxide in molten cyolite
49
role of cryolite
reduce the melting point.increases electrical conductivity.acts as a solvent
50
aluminium extraction is conducted in
steel tank with graphite
51
aluminium extraction cathode
graphite lining acts as a cathode
52
aluminium extraction anode
anode is a group of electrodes dipped into the electrolyte
53
aluminium extraction cathode
Al3+3e=Al
54
aluminium extraction anode
2o2=o2=4e

Chemistry (7 decks)

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