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GCSE Chemistry 11L1 > 2.7 Electrolysis > Flashcards

2.7 Electrolysis Flashcards

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1
Q

Metals like gold are found as pure metals rather than ores in the earth because they are…

A

Unreactive

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2
Q

What form must a substance be in, in order to be electrolysed?

A

Molten

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3
Q

Negative electrode is called?

A

Cathode

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4
Q

Positive electrode is called?

A

Anode

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5
Q

If MgO2 is being electrolysed, would it be Mg or O that goes to the Cathode?

A

Mg because it is a positive ion and opposites attract

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6
Q

What is oxidation?

A

Loss of electrons

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7
Q

What is reduction?

A

Gain of electrons (electrons are negatively charged so I gain of them is technically reduction!)

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8
Q

Which process is cheaper? Recycling or extraction?

A

Recycling

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9
Q

What is electroplating?

A

Coat an object with a thin layer of (another) metal

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10
Q

What is electrolysis powered by?

A

Electricity

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11
Q

What is the electrolysis of brine?

A

The electrolysis of brine is a large-scale process used to manufacture chlorine from salt

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12
Q

Why is the extraction of aluminium expensive

A

Mostly because of the amount of electricity used

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13
Q

Which electrode does the aluminium metal form at

A

The negative electrode

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14
Q

What is aluminium ore called?

A

Bauxite

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15
Q

How is the aluminium oxide prepared for electrolysis

A

the aluminium oxide must be melted so that electricity can pass through it

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16
Q

What Is the definition of electrolysis?

A

The process of electrolysis is using an electric current to make a chemical change and make new chemicals

17
Q

What are the environmental impacts of the electrolysis of brine?

A

It uses a lot of electricity that is mainly produced by the burning of fossil fuels. During electrolysis, metal must be in contact with the solution of brine. A metal commonly used is mercury which is toxic, some mercury escapes into the solution and into the environment.

GCSE Chemistry 11L1 (23 decks)

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