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Chemistry > C10- Electrolytic Processes > Flashcards

C10- Electrolytic Processes Flashcards

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1
Q

What is electrolysis

A

Electricity broke down into acidified water and hydrogen and oxygen

We can break down substances

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2
Q

What’s an electrolyte

A

When an ionic solid is melted or dissolved in water - bonds break so ions can move freely

An ionic substance with feeling moving ions is an electrolyte and can conduct electricity

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3
Q

What does electrolysis use

A

Energy transferred by electricity to decompose electrolytes

The substances become atoms and stop being ions

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4
Q

What are electrodes

A

They are connected to a direct current electricity supply and placed into the electrolyte

The two types of ions carry opposite charges so migrate to the electrode wth the opposite charge

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5
Q

What are cations

A

Are positive ions that are attracted to negative cathode

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6
Q

What are anions

A

Are negative ions that are attracted to positive anode

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7
Q

What happens at the anode

A

Negative ions lose electrons

OXIDATION

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8
Q

What happens at cathode

A

Electrons are transferred from the electrode to the positive ions (

REDUCTION

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9
Q

What’s oxidation and reduction

A

OIL RIG

oxidation is loss of electrons and gain of oxygen

Reduction is gain of electrons and loss of oxygen

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10
Q

What do half equations do

A

Show the change at each electrode

reduCtion takes place at Cathode

OxidAtion takes place at Anode

Check page 81 text book

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11
Q

What is electrolysis

A

Electricity broke down into acidified water and hydrogen and oxygen

We can break down substances

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12
Q

What’s an electrolyte

A

When an ionic solid is melted or dissolved in water - bonds break so ions can move freely

An ionic substance with feeling moving ions is an electrolyte and can conduct electricity

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13
Q

What does electrolysis use

A

Energy transferred by electricity to decompose electrolytes

The substances become atoms and stop being ions

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14
Q

What are electrodes

A

They are connected to a direct current electricity supply and placed into the electrolyte

The two types of ions carry opposite charges so migrate to the electrode wth the opposite charge

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15
Q

What are cations

A

Are positive ions that are attracted to negative cathode

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16
Q

What are anions

A

Are negative ions that are attracted to positive anode

17
Q

What happens at the anode

A

Negative ions lose electrons

OXIDATION

18
Q

What happens at cathode

A

Electrons are transferred from the electrode to the positive ions (

REDUCTION

19
Q

What’s oxidation and reduction

A

OIL RIG

oxidation is loss of electrons and gain of oxygen

Reduction is gain of electrons and loss of oxygen

20
Q

What do half equations do

A

Show the change at each electrode

reduCtion takes place at Cathode

OxidAtion takes place at Anode

Check page 81 text book

21
Q

How is the electrolysis of molten or dissolved ionic salts carried out

A

Using inert (interactive) electrodes

Typically graphite or platinum

22
Q

What happens when a molten Salt is electrolysed

A

Ions are discharged as atoms or molecules at the electrode

23
Q

How can you predict the products from the electrolysis of any molten salt

A

Salt will always decompose into its elements

METAL AT CATHODE

NON METAL AT ANODE

24
Q

Tell me about the electrolysis of salt solutions

A

So In an aqueous solution of salt, there’s some hydrogen and hydroxide ions

Overall water decomposes to form hydrogen and oxygen

25
Q

When does water decompose to hydrogen and oxygen

A

During electrolysis of water acidified with dilute sulfuric acid

26
Q

How can copper be purified

A

Electrolysis of copper sulfate solution using copper electrodes

Atoms become ions and go to cathode to be deposited as pure copper

At the anode there forms sludge

Chemistry (14 decks)

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