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C1 topic 3: Chemical changes > Electrolysis > Flashcards

Electrolysis Flashcards

1
Q

What is electrolysis?

A

The process of using electrolysis to decompose (break down) compounds

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2
Q

During electrolysis, what is the solution being broken down known as?

A

The electrolyte

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3
Q

What is needed for electrolysis

A

a power supply, an electrolyte, electrodes

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4
Q

What is the positive electrode known as?

A

Anode

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5
Q

What is the negative electrode known as?

A

Cathode

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6
Q

What are cations?

A

positive ions

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7
Q

What are anions?

A

negative ions

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8
Q

How do cations move during electrolysis?

A

Towards the negative cathode

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9
Q

How do anions move during electrolysis?

A

Towards the positive anode

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10
Q

What happens to anions at the anode?

A

They lose electrons to become atoms

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11
Q

What happens to cations at the cathode?

A

They gain electrons to become atons

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12
Q

What is an aqueous solution?

A

A solution dissolved in water.

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13
Q

Which extra ions are contained in an aqueous solution?

A

hydrogen and hydroxide (H+ and OH-)

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14
Q

What is produced at the anode and cathode during the electrolysis of copper chloride solution?

A

Copper at the cathode and chlorine gas at the anode

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15
Q

What is produced at the anode and cathode during the electrolysis of sodium chloride solution?

A

hydrogen gas at the cathode and chlorine gas at the anode

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16
Q

What is produced at the anode and cathode during the electrolysis of sodium sulphate solution?

A

hydrogen gas at the cathode, oxygen at the anode

17
Q

What is produced at the anode and cathode during the electrolysis of sulphuric acid solution?

A

hydrogen gas at the cathode, oxygen at the anode

18
Q

What is produced at the anode and cathode during the electrolysis of molten lead bromide?

A

lead at the cathode, bromine at the anode

19
Q

How can you predict what will be produced at the cathode during electrolysis of an aqueous solution?

A

If the metal in the electrolyte is below hydrogen in the reactivity series, it will be produced. Otherwise hydrogen gas is produced

20
Q

How can you predict what will be produced at the anode during electrolysis of an aqueous solution?

A

If the electrolyte contains chloride, bromide, iodide or fluoride, the element will be produced. Otherwise oxygen gas.

21
Q

What happens to the mass of the electrodes when electrolysis of copper sulphate is carried out using copper electrodes?

A

The anode will gain mass and the cathode will lose mass?

22
Q

What happens to the mass of the electrodes when electrolysis of copper sulphate is carried out using inert electrodes?

A

The mass of electrodes will not change

C1 topic 3: Chemical changes (3 decks)

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