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161 > Redox and Electrochemistry > Flashcards

Redox and Electrochemistry Flashcards

1
Q

Oxidation is when

A

OIL RIG

Loss of electrons , gain of oxygen

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2
Q

Reduction is when

A

OIL RIG

Gain of electrons , loss of oxygen

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3
Q

What is the cell notation for this electrochemical cell?

A
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4
Q

Explain why there is potential to do electric work between two half-cells

A

Charge builds up at Phase Boundary

Half Reaction equilibria in both half cells (not redox)

Both half-cells are held at different electric potentials

Work is done when the charge moves between electric potentials.

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5
Q

How do you calculate the Maximum electrical work?

A

Charge * Electric Field Strength

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6
Q

What is cell potential

A

Comparison of the relative oxidative and reductive abilities of a half cell.

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7
Q

what is a state function

A

a function that is independent of the journey taken, just dependant on the state of the current system.

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8
Q

What is the SHE

A

standard hydrogen electrode

Reference for all other potential measurements

0.00V

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9
Q

how do you calculate E Cell

A

E Cathode - E anode
Eright - Eleft

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10
Q

What happens at the cathode

A

Reduction

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11
Q

What happens at the anode

A

Oxidation

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12
Q

If an E Cell is more positive what does it mean

A

Better oxidising agent (Easier to reduce)

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13
Q

If an E Cell is more negative what does it mean

A

Better reducing agent (Easier to oxidise)

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14
Q

use free gibs to derive an equation for E Cell in terms of the Equilibrium constant and Temperature

A
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15
Q
A
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16
Q

What is corrosion

A

conversion of metals to more stable forms such as oxides hydroxides or sulfides
destroys metal

17
Q

What environmental conditions accelerate corrosion?

A

Humidity
Temperature
Chlorine Ions on Iron
Acids
Microbes

18
Q

Explain Galvanic Corrosion

A

Metal is in contact with water/oxidising solution.

acts as a contact between 2 dissimilar metals

contact between 2 half cells.

19
Q

Explain Uniform Corrosion

What is it enhanced by

A

Metal is in contact with water/oxidising solution.

acts as a contact between 2 identical metals

contact between 2 half cells at some distance undergoing different processes.

enhanced by the presence of cl- or similar ion

20
Q

Explain Barrier Protection of Corrosion

A

Anodization
creation of inert oxide later on top of the metal

pain, enamel , plating

21
Q

Explain the Cathodic Protection of Corrosion

A

The sacrificial anode attached to piece to protect it, needs to be replaced regularly

22
Q

What reactions occur in a lead acid battery (Car Battery)

A
23
Q

What reactions occur in an alkaline battery (Car Battery)

A
24
Q

how to you calculate the emf of a half cell

A
25
Q
A

161 (11 decks)

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