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Chemistry > Redox Reactions > Flashcards

Redox Reactions Flashcards

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1
Q

Redox Reaction

A

Pair of simultaneous oxidation and reduction reactions in which electrons are exchanged between reactants

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2
Q

Oxidation

A

Loss - a chemical species loses one or more electrons

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3
Q

Reduction

A

Gain - a chemical species gains one or more electrons

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4
Q

Oxidising Agent

A

Is reduced, enables other species to be oxidised

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5
Q

Reducing Agent

A

Is oxidised, enables other species to be reduced

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6
Q

Pure Elements

A

Oxidation state of 0

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7
Q

Group 1 (Alkali) Metals

A

Oxidation state of +1 in a compound

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8
Q

Group 2 (Alkaline earth) Metals

A

Oxidation state of +2 in a compound

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9
Q

Hydrogen

A

Oxidation state of +1 except for in a metal hydrite, oxididation state of -1

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10
Q

Oxygen

A

Oxidation state of -2 except for peroxide, oxidation state of -1

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11
Q

Electrochemical Cells

A

Utilise redox reactions to produce an electric current, purify metal alloys or coat one metal layer onto another

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12
Q

Voltaic (Galvanic) Cell

A

Utilises spontaneous redox reactions to create an electric current, half reactions are seperated, connecting leads attached to electrodes and salt bridge creates closed circuit

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13
Q

Anode

A

Negative charge, source of electrons, oxidation occurs

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14
Q

Salt Bridge

A

Anions travel towards anode, cations travel towards cathode

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15
Q

Cathode

A

Positive, gains electrons, reduction occurs

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16
Q

Electrolysis

A

Process where an electrochemical cell is provided with an electrical current to make a non-spontaneous reaction occur

17
Q

Primary Cells

A

Batteries that are non-rechargeable, produce a low voltage, non-reversible reaction meaning once all the reactions are used up, the battery ‘dies’

18
Q

Hydrogen Fuel Cells

A

Environmentally friendly alternative to petrol consuming engines, use hydrogen and oxygen gas and produce water as a waste product

19
Q

Biofuel

A

Fuel made from biomass commonly sugarcane waste, corn, soybean oil or cellulose from plants

Chemistry (5 decks)

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