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GCSE AQA Chemistry > C6 Electrolysis > Flashcards

C6 Electrolysis Flashcards

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1
Q

What is an electrolyte?

A

A compound that is broken down by electrolysis

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2
Q

What are the two electrodes?

A

Cathode

Anode

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3
Q

What is the negative electrode?

A

Cathode

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4
Q

What is the positive electrode?

A

Anode

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5
Q

What happens during electrolysis?

A

Positively charged ions move to the cathode, negatively charges ions move to the anode

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6
Q

What is reduction?

A

Gain of electrons

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7
Q

What is oxidation?

A

Loss of electrons

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8
Q

Why are the electrodes made of an unreactive substance?

A

So they electrodes don’t react with the electrolyte or the products made in elecrolysis

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9
Q

What reaction is at the negative electrode?

A

Reduction reaction(loss of electrons)

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10
Q

What reaction is at the anode(positive electrode)?

A

Oxidation(gain of electrons’

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11
Q

Which metals are extracted through electrolysis?

A

Metals that are more reactive than carbon

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12
Q

What is used to reduce the melting point of aluminium oxide?

A

Cryolite

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13
Q

What is the half equation for aluminium at the cathode?(reduction reaction)

A

Al3+ + 3e-=AL

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14
Q

What is the half equation for oxygen at the anode?(oxidation reaction)

A

O2- = O-2e-

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15
Q

Why must the anode be replaced regularly?(GOT THIS WRONG IN DECEMBER MOCKS)

A

The oxygen molecules produced at the anode react with the graphite forming carbon dioxide gas

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16
Q

Water molecules ionise or split forming ________^and ___________

A
  • hydrogen ions(h+ ions)

- hydroxide ions(OH- ions)

17
Q

The h+ ions (from ionised water) is attracted to the?

A

Cathode

18
Q

The OH- ions(from ionised water)is attracted to the ______

A

Anode

19
Q

In aqueous solutions, Hydrogen is produced at the cathode if _______________

A

Them metal is more reactive than hydrogen

20
Q

Para nos otros

A

Sui

GCSE AQA Chemistry (22 decks)

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