Redox Reactions and Electrochemistry Flashcards

1
Q

Oxidation

A

loss of electrons

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2
Q

Reduction

A

gain of electrons

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3
Q

Oxidizing Agent

A

causes another atom to undergo oxidation and itself is reduced

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4
Q

Reducing Agent

A

causes another atom to undergo reduction and itself is oxidized

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5
Q

Galvanic Cells

A

Spontaneous

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6
Q

Electrolytic Cells

A

Nonspontaneous

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7
Q

Anode and Cathode Charges in Galvanic Cells

A

Anode: negative
Cathode: positive

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8
Q

Anode and Cathode Charges in Electrolytic Cells

A

Anode: positive
Cathode: negative

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9
Q

Oxidation ALWAYS at the:

A

ANODE

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10
Q

Reduction ALWAYS at the:

A

CATHODE

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11
Q

Reduction Potential

A

The tendency of a species to acquire electrons and be reduced

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12
Q

Standard Reduction Potentials

A

are used to calculate the standard electromotive force of a reaction, the difference in potential between the two half cells

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13
Q

emf=

A

emf = Ecathode - Eanode

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14
Q

Gibbs Free Energy in a Electrochemical Cell

A

ΔG = -nFEcell

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15
Q

Oxidation Number of a free element

A

0

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16
Q

Oxidation of a monatomic ion

A

equal to overall charge

17
Q

Oxidation Number of Group 1A and 2A

A

+1 and +2

18
Q

Oxidation Number of Group VIIA

A

-1 (unless paired with more EN element)

19
Q

Oxidation Number of Hydrogen

A

+1 (unless paired with group 1 or 2)

20
Q

Oxidation Number of Oxygen in a compound

A

-2

21
Q

Plating/Galvanization

A

ions will precipitate onto the cathode

22
Q

Faradays Constant

A

10 x 10^5 c/mole

23
Q

Electrodeposition Equation

A

determines the number of moles of element being deposited on a plate:

mol M = It / nf

I: current

t: time
n: # electron equivalents
f: Faradays constant (10x10^5)