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CHEM 203 > Electrochemistry > Flashcards

Electrochemistry Flashcards

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1
Q

What is reduction?

A

Gaining electrons.

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2
Q

What is oxidation?

A

Losing electrons.

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3
Q

What is the oxidizing agent?

A

The element that gains electrons.

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4
Q

What is the reducing agent?

A

The element that loses electrons.

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5
Q

What is the standard reduction potential?

A

These are the potentials/voltages that are measured against the standard H electrodes.

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6
Q

What is the reduction potential sign for a spontaneous reaction?

A

+, > 0

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7
Q

What is the reduction potential sign for a nonspontaneous reaction?

A

-, < 0

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8
Q

What can we use to find the reduction potential?

A
  1. ) Measure directly with a voltmeter
  2. ) Calculate using standard reduction potentials
  3. ) Calculate using the equilibrium constant
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9
Q

What is the strongest OA?

A

Copper - top right

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10
Q

What is the strongest RA?

A

Cobalt - bottom left

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11
Q

What happens in the cathode?

A

Reduction

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12
Q

What happens in the anode?

A

Oxidation

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13
Q

What 2 elements are needed to find spontaneity?

A
  1. ) The number of electrons being transferred

2. ) Based on how difficult it is to move the electrons

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14
Q

What can be used to predict spontaneity?

A
  1. ) E cell values
  2. ) Gibb’s Free Energy
  3. ) Q vs K
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15
Q

What 2 factors impact the cell potential?

A
  1. ) The tendency to oxidize or reduce

2. ) Standard conditions - typically use non-standard conditions.

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16
Q

How to determine the tendency of a substance to oxidize or reduce?

A

The standard Ecell because the greater the value for a substance that substance is the OA and is reduced. However if the standard Ecell is less positive and a smaller value that substance is the RA and is oxidized.

17
Q

What happens to the Ecell, K, and G when products are favored?

A
  • K»1
  • Ecell>0
  • G<0
18
Q

What happens to the Ecell, K, and G when reactants are favored?

A
  • K«1
  • Ecell<0
  • G>0

CHEM 203 (7 decks)

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