Electrolysis Flashcards
What is the positive electrode called and what moves towards it?
Anode and negatively charged ions move there.
What does electrolysis do?
It uses an electrical current to breakdown a substance made of ions into a simpler substance.
What is the negative electrode called and what moves towards it?
Anode and positively charged ions move there.
What happens when the ions reach the electrode?
They can loose there charge and be deposited as elements.
What is (l)?
Liquid
What is (g)?
Gas
What is (aq)?
Dissolved in water.
What is (s)?
Solid.
How can substances with very high melting points be electrolysed?
Some dissolve in water so there ions can then move freely.
How do you negatively charged ions become neutral atoms in electrolysis?
They lose electrons.
How do you positively charged ions become neutral atoms in electrolysis?
They gain electrons.
What is gaining electrons is called?
Reduction.
What is losing electrons called?
Oxidation.
Why is electrolysis in water more complicated?
Because water contains ions.
What is brine?
Sodium chloride solution.
What three products can be made when we pass electric current through brine?
Hydrogen
Chlorine
Sodium hydroxide solution.
How can we use the chlorine produced by the electrolysis of brine?
It can be reacted with sodium hydroxide solution to make bleach.
It can be used to kill bacteria public health such as swimming pools.
How can we use the hydrogen produced by the electrolysis of brine?
The hydrogen can be used in the food industry to make margarine.
How can we use the sodium hydroxide produced by the electrolysis of brine?
It can be used to make soap and paper and also reacted with chlorine to make bleach.
What happens at the anode when we purify copper using electrolysis?
Copper irons are oxidise.
What happens at the cathode when we purify copper using electrolysis?
Copper ions are reduced.
