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What do ionic substances contain?
Charged particles called ions.
What is electrolysis?
Breaking ionic substances down using electricity.
Why cant covalent compounds act as electrolytes?
Because they contain neutral atoms.
Why must the ions be free to move in electrolysis?
So they're able to dissolve in water or be melted.
What happens during electrolysis?
Positive charged ions move to the negative electrode, they gain electrons and are reduced. Then, the positive charged ions move to the negative charged electrode and the electrons are oxidised.
When do new substances form?
When a molten or dissolved ionic compound conducts electricity.
When are carbon electrodes chosen?
When they have a high melting point.
Where is a metal formed and why?
At the negative electrode because the positive metal ions are attracted.
When is a non-metal formed and why?
At the positive electrode because they negative non-metal ions are attracted.
When will a metal be produced?
If it is less reactive than hydrogen.
When will hydrogen be produced?
If the metal is more reactive than hydrogen.
What happens if a
solution is very dilute?
Oxygen will be given off instead of the halogen.