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High School > Chem 30 Unit 2 > Flashcards

Chem 30 Unit 2 Flashcards

1
Q

oxidation

A

LEO. losing electrons; becoming more positive

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2
Q

reduction

A

gaining electrons; becoming more negative

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3
Q

oxidation, aka…

A

reducing agent

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4
Q

reduction, aka…

A

oxidizing agent

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5
Q

when writing half reactions…

A

always add the electrons to the more positive side

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6
Q

spontaneous reaction

A

If the OA is higher than the RA

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7
Q

non-spontaneous reaction

A

If the OA is lower than the RA

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8
Q

redox stoich

A

find SOA and SRA to build a redox equation

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9
Q

disproportionation reaction

A

an element/compound undergoes both oxidation and reduction

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10
Q

electrochemical cells

A

devices that use redox reactions to produce/use electricity

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11
Q

voltaic (galvanic) cells

A

produce electricity; spontaneous reaction
Has positive voltage value.
Chemical (potential energy) → electrical energy

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12
Q

electrolytic cell

A

use electricity to drive a reaction; non-spontaneous reaction. Have a negative voltage value (requires minimum value of voltage for reaction to occur). Electrical energy is used to bring about chemical change.

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13
Q

inert electrodes…

A

do not take part in the reaction

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14
Q

electrodes

A

are solid. The location where oxidation and reduction occur.

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15
Q

voltmeter

A

measures differences in electric potential energy. Connected between the wire in voltaic cells.

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16
Q

electrolytic cell wire

A

a battery is connected

17
Q

electron flow in electrochemical cells

A

electrons flow from anode to cathode (alphabetically)

18
Q

cation/anion flow

A

Cations flow to the cathode; anions flow to the anode.

19
Q

in electrolytic cells…

A

anode is positive, cathode is negative

20
Q

inert electrode examples…

A

C, Pt

21
Q

electrolytic cells…

A

only utilize one container

22
Q

molten reactions…

A

do not include water; cannot calculate voltage using data book

23
Q

coulomb =

A

amp x second

24
Q

chloride exception

A

when only H2O and Cl- are available for the SRA, the Cl- will be the SRA.

25
Q

electroplating

A

use of electrolysis to deposit a thin coating of metal on an object

26
Q

electroplating metals

A

the object is made the cathode. The plating metal constitutes the anode of the cell.

27
Q

corrosion

A

a spontaneous redox reaction

28
Q

galvanization

A

dipping metal in molten zinc

29
Q

sacrificial anode (cathodic protection)

A

Technique to protect a metal from corrosion by connecting it to a second metal that is more easily oxidized.
The metal that is to be protected is made the cathode (behaves as an inert electrode)

30
Q

What cannot be a sacrificial anode?

A

groups ones

31
Q

sacrificial anodes…

A

are materials that are a stronger SRA than the material that you want to protect.

High School (18 decks)

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