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CHEMISTRY IGCSE > Electrochemistry > Flashcards

Electrochemistry Flashcards

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1
Q

Define electrolysis.

A

decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current

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2
Q

What is the anode?

A

the positive electrode

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3
Q

What is the cathode?

A

the negative electron

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4
Q

What is the electrolyte?

A

the molten or aqueous substance that undergoes electrolysis

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5
Q

What are formed at the cathode?

A

metals or hydrogen

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6
Q

What are formed at the anode?

A

non-metals (except hydrogen)

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7
Q

What process occurs at the anode?

A

oxidation

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8
Q

What process occurs at the cathode?

A

reduction

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9
Q

Why are metal objects electroplated?

A

to improve their appearance and resistance to corrosion

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10
Q

What process makes metal objects more resistant to corrosion and with improved appearance?

A

electroplating

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11
Q

What does a hydrogen–oxygen fuel cell do?

A

uses hydrogen and oxygen to produce electricity with water as the only chemical product

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12
Q

Electrolysis of MOLTEN LEAD(II) BROMIDE: product at the anode

A

bromine

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13
Q

Electrolysis of MOLTEN LEAD(II) BROMIDE: product at the cathode

A

lead

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14
Q

Electrolysis of MOLTEN LEAD(II) BROMIDE: observations

A

cathode: silvery solid
anode: brown gas

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15
Q

Electrolysis of concentrated aqueous NaCl: product at the anode

A

chlorine

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16
Q

Electrolysis of concentrated aqueous NaCl: product at the cathode

A

hydrogen

17
Q

Electrolysis of concentrated aqueous NaCl: observations

A

cathode: colourless gas, lit splint squeaky pop

anode: pale yellow-green gas (turns UI red and bleaches red litmus)

18
Q

Electrolysis of dilute sulfuric acid: product at the anode

A

oxygen

19
Q

Electrolysis of dilute sulfuric acid: product at the cathode

A

hydrogen

20
Q

Electrolysis of dilute sulfuric acid: observations

A

anode: colourless gas, relights glowing splint
cathode: colourless gas, lit splint squeaky pop

CHEMISTRY IGCSE (16 decks)

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