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chemistry > electrochemistry > Flashcards

electrochemistry Flashcards

1
Q

daniel cell

A

Zn-Cu

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2
Q

conditions for electrolyte used in salt bridge

A
  1. inert electrolyte 2. good ionic mobility 3. equal mobility
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3
Q

oxidation potential

A

tendency to lose e

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4
Q

more negative potential = more _ potential

A

oxdn

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5
Q

factors affecting electrode potential

A
  1. nature of metal and its ions 2. concentration of ions 3. temperature
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6
Q

Delta G formula

A

-nFdeltaV

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7
Q

farad value

A

96500

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8
Q

farad value

A

96500

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9
Q

nernst eq

A

E=Eo-0.059(logP/R)/n

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10
Q

equilibrium constant

A

Eoc×n/0.059

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11
Q

faraday law 1

A

m is directly proportional to Q
m=ZQ=Zit
Z=E/F

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12
Q

faraday law 2

A

m directly proportional to Eq Mass

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13
Q

product on electrolysis of molten nacl /inert electrodes

A

Na and Cl

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14
Q

on electrolysis of MgBr2 molten with Pt electrodes, brown vapours formed are of?

A

Br2

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15
Q

electrolyssi of Aq NaCl conc with Pt electrode

A

NaOH is left and Cl2 and H2 escape

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16
Q

product of electrolysis of dil nacl and anode cathode ions

A

Nacl gives Na and Cl
H2o gives H and Oh
Anode- OH (since conc more than cl) and Cathode- H

17
Q

Aq Nacl with Hg as cathode, Pt as anode

A

at cathode, Hg and Na react to form sodium amalgan
anode- Cl oxidised

18
Q

what happens on electrolysis of Aq Nacl with Aq electrodes

A

anode-Ag/Ag+
cathode-Ag+/Ag
gradually cathode becomes heavier and anode becomes lighter

19
Q

what is aq Nacl with ag electrodes used fir

A

metal refining and electroplating

20
Q

cell constant

21
Q

conducivity formula

A

K=conductance×cell const

22
Q

molar conductivity formula

23
Q

equivalent conductivity formula

24
Q

relation between eq and molar conductivity

A

molar/eq=X

25
Q

how does dilution affect conductance, conductivity and molar/eq conductivities of electrolytes

A
  1. inc
  2. dec
  3. inc
26
Q

dry cell/leclance cell electrodes

A

A- zinc, C- Graphite with MnO2+c powder

27
Q

mercury cell

A

a- znhg amalgam, c- HgO and Cpaste

28
Q

lead storage battery electrodes

A

A-zn, C- Pb grid packed with PbO2

29
Q

fuel cells are

A

galvanic cells designed to convert energy of combustion of fuels into electrical energy

30
Q

what is iron plated with to prevent corrosion

31
Q

what acts as the catalyst during rusting

32
Q

H2SO4 is consumed when lead storage battery is

A

discharged

33
Q

in an electrolytic cell, current flows from

A

Cathode to anode

34
Q

what is the cathode in a dry cell

A

carbon rod

35
Q

in a leclanche cell, zn rod is placed in

chemistry (7 decks)

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