2.7 Electrolysis Flashcards Preview

GCSE Chemistry 11L1 > 2.7 Electrolysis > Flashcards

Flashcards in 2.7 Electrolysis Deck (17)
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1

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

Unreactive

2

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

Molten

3

Negative electrode is called?

Cathode

4

Positive electrode is called?

Anode

5

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

Mg because it is a positive ion and opposites attract

6

What is oxidation?

Loss of electrons

7

What is reduction?

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

8

Which process is cheaper? Recycling or extraction?

Recycling

9

What is electroplating?

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

10

What is electrolysis powered by?

Electricity

11

What is the electrolysis of brine?

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

12

Why is the extraction of aluminium expensive

Mostly because of the amount of electricity used

13

Which electrode does the aluminium metal form at

The negative electrode

14

What is aluminium ore called?

Bauxite

15

How is the aluminium oxide prepared for electrolysis

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

16

What Is the definition of electrolysis?

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

17

What are the environmental impacts of the electrolysis of brine?

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.