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GCSE AQA Chemistry Flashcards > C6 Electrolysis > Flashcards

C6 Electrolysis Flashcards

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1
Q

What does the suffix ‘lysis’ in electrolysis mean?

A

Breaking

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2
Q

Define electrolysis.

A

The decomposition of an ionic compound using electricity

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3
Q

What is an electrolyte?

A

An ionic compund which is melted or dissloved in water.

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4
Q

What is PANIC?

A

Positive Anode
(P) (A)
Negative Cathode
(N) (I) (C)

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5
Q

What is an anode?

A

Positive electrode

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6
Q

What is a cathode?

A

Negative electrode

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7
Q

What occurs at the anode during electrolysis?

A

Oxidation occurs at the anode.

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8
Q

What occurs at the cathode during electrolysis?

A

Reduction occurs at the cathode.

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9
Q

In aqueous electrolysis what is discharged (reduced) at the cathode?

A

Hydrogen - unless there is a less reactive metal

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10
Q

In aqueous electrolysis what is oxidised at the anode?

A

Halide ions are oxidised first, if there are no halide ions then hydroxide ions are oxidised

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11
Q

What is brine?

A

Concentrated sodium chloride solution (that can undergo electrolysis to produce chlorine gas, hydrogen gas and sodium hydroxide solution)

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12
Q

What does inert mean?

A

Unreactive

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13
Q

What is an anion?

A

A negative ion.

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14
Q

What is a cation?

A

Positive ion,

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15
Q

Which ions are attracted to the cathode?

A

Cations

  • because the cation is a positive ion and the cathode is a negative electrode
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16
Q

Which ions are attracted to the anode?

A

Anions

  • because anions are negative ions and anode is the positive electrode
17
Q

Why can electrolysis only occur when an ionic compound is molten or in aqueous solution?

A

Because in an ionic compound ions can only move freely when melted or dissolved in water.

18
Q

What is oxidation in electrolysis?

A

Loss of electrons.

19
Q

What is reduction in electrolysis?

A

Gain of electrons.

20
Q

Why is cryolite used in the manufacture of aluminium?

A

It lowers the melting point of aluminium oxide, reducing energy costs.

GCSE AQA Chemistry Flashcards (15 decks)

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