Electrolysis- extended

Created by

Olivia

Cards (22)

Why is electrolysing aqueous solutions more complex than molten?
As water has H+ and OH- ions
What is the rule for the cathode in electrolysis of ionic solutions?
If higher than hydrogen, hydrogen forms
What is the rule for the anode in electrolysis of ionic solutions?
If halide is present, the halide forms
What is an alloy?
A mixture of two or more elements where at least one is a metal
What are the properties of alloys?
easy to bend and pull into wires
Hard
Can be heated to a high temperature
Doesn't rust easily
What are the properties of aluminium?
Soft, ductile and good conductor
What is aluminium used in?
Drinks cans and window frames
What are the properties of copper?
Malleable, corrosion resistant and lustrous
What is copper used in?
Electrical wire and decoration
What are the properties of titanium?
Corrosion resistant and a good conductor of heat
What is titanium used in?
Bikes, jewellery and drill bits
What does electrolysis of water split H2O into?
Hydrogen and oxygen
What is the reaction for the electrolysis of water?
Water > hydrogen+ oxygen
What happens at the cathode?
Reduction
What happens at the anode?
Oxidation
What can electrolysis also be used for?
Electroplating
What is electroplating useful for?
Coating a cheaper metal with a more expensive one
What is the negative electrode when electroplating?
The object to be electroplated
What is the positive electrode in electroplating?
The metal you want to coat the object with
What is the electrolyte when electroplating?
A solution of the metal used for coating
As an example, how would silver be used in electroplating a necklace?
Necklace connected to the negative
Silver connected to positive
Electrolyte= silver nitrate solution
How is copper purified?
Beaker with pure and impure copper rods in copper sulfate solution
Pure rod at positive
Impure rod at negative
Pure copper increases in size
Impure rod deteriorates