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GCSE AQA Chemistry Unit 2+3 > C2 Electrolysis > Flashcards

C2 Electrolysis Flashcards

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1
Q

Give the half equation for the reaction at the positive electrode?

A

2Cl- → Cl2 +2e-

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2
Q

What do the following state symbols mean?

(g)

(s)

(aq)

(l)

A

​Gas

Solid

Aqueous=dissolved in water

Liquid

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3
Q

What happens to the ions at the positive electrode?

A

Negative ions lose electrons

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4
Q

How can copper be purified using electrolysis?

A

Use copper solution and 1 pure electrode and one impure electrode

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5
Q

Give one use of each product?

A

Sodium hydroxide =soap

Chlorine=clean water

Hydrogen=margarine

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6
Q

What is electroplating?

A

Using electrolysis to add a thin layer of metal

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7
Q

Give the half equation for the reaction at the negative electrode?

A

2H+ + 2e-→ H2

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8
Q

What is electrolysis?

A

Using electricity to break up an ionic substance

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9
Q

During electrolysis what happens to the positive ions?

A

Attracted to the negative electrode

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10
Q

What happens at the negative electrode in the electrolysis of aluminium oxide?

A

Al3+ + 3e-→Al

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11
Q

What are the 3 products of the electrolysis of sodium chloride solution?

A

Sodium hydroxide, Chlorine, Hydrogen

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12
Q

What does OILRIG mean?

A

Oxidation is loss of electrons

Reduction is gain of electrons

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13
Q

What happens over time to the positive electrode in the electrolysis of aluminium oxide?

A

Carbon reacts with the oxygen to produce carbon dioxide and the electrode shrinks and has to be replaced.

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14
Q

What happens at the positive electrode in the electrolysis of aluminium oxide?

A

2O2- → O2 +4e-

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15
Q

What is cryolite used for?

A

To lower the melting point of the aluminium oxide

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16
Q

During electrolysis what happens to the negative ions?

A

Attracted to the positive electrode

17
Q

What are ions able to do when melted or dissolved in water?

A

Move

18
Q

What happens to the ions at the negative electrode?

A

Positive ions gain electrons

GCSE AQA Chemistry Unit 2+3 (13 decks)

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