Electroloysis Flashcards
What is electrolysis?
The process where ionic substances are broken down into simpler substances using electricity.
For electrolysis, the ions must be free to move. They are free to move when an ionic substance is?
Dissolved in water or melted
Positively charged ions move to the …. Electrode. They receive electrons and are …..
Negative. Reduced.
Negatively charged ions move to the ,.. Electrode. They lose electrons and are ….
Positive, oxidised
The substance that is broken down is called the?
Electrolyte
Why is it used to electroplated objects?
To coat a cheaper metal with a more expensive one.
In electroplating, the negative electrode is the object that?
Is going to be electroplated
In electroplating, the positive electrode should be the metal that you want to?
Coat the object with
In electroplating, the electrolyte should be?
A solution of the coating metal, such as its metal nitrate or surface.
Why is aluminium expensive?
Because it has to be extracted using electrolysis, which uses up a lot of electricity and is very expensive.
How is aluminium extracted?
Aluminium oxide dissolved in moltencryolite as has a very high melting point and would be too expensive to melt. Then use electrolysis.
At the negative electrode, the metal will be produced if the ion is …. Reactive than hydrogen
Less
Hydrogen will be produced if the metal is …. Reactive than hydrogen
More
