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Chemistry C2 > Electrolysis > Flashcards

Electrolysis Flashcards

0
Q

What is electrolysis

A

Passing through an electric current through ionic substances that are molten or in a solution to break then down into the elements

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1
Q

When an ionic substance is melted or dissolved in water, what happens

A

The ions are free to move about within the liquid or solution

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2
Q

What is the substance that is broken down called?

A

The electrolyte

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3
Q

What happens during electrolysis

A

Positively charged ions move to the negative electrode

Negatively charged ions move to the positive electrode

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4
Q

What is electrolysis used to do?

A

Electroplate objects

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5
Q

Why do we need to electroplate objects

A

Could be for copper plating and silver plating

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6
Q

What happens at the negative electrode

A

Positively charged ions gain electrons (reduction)

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7
Q

What happens at the positive electrode

A

Negatively charged ions lose electrons

Oxidation

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8
Q

What are oxidation and reduction

A

Redox reactions

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9
Q

What is OILRIG

A

Oxidation is losing

Reduction is gaining

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10
Q

What is the negative electrode called

A

Cathode

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11
Q

What is the positive electrode called

A

Anode

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12
Q

What are ions

A

Atoms with a positive or negative charge

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13
Q

What happens if there’s a mixture of ions

A

The products formed depend on the reactivity of the elements involved

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14
Q

Aluminium is manufactured by the electrolysis of what?

A

A molten mixture of aluminium oxide and cryolite

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15
Q

Where does aluminium form?

A

At the cathode

16
Q

Where does oxygen form?

A

The anode

17
Q

What is the positive electrode made of

A

Carbon which reacts with the oxygen to produce carbon dioxide

18
Q

What does the electrolysis of sodium chloride solution produce

A

Hydrogen and chlorine

Sodium hydroxide solution is also produced

19
Q

What are these important for

A

The chemical industry
E.g. Sodium hydroxide for the production of soap
And chlorine for production of bleach and plastics

20
Q

What is cryolite used for

A

To lower the temperature

Chemistry C2 (14 decks)

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