Electrolytic Processes Flashcards
When electrolysising molten substances there is only…..
The molten elements in question in the mixture
What are positive ions called
Cations
What are negative ions called
Anions
Where do anions go in electrolysis
To the anode
Where do cations go in electrolysis
Cathode
Positive ions go to the………
Negative anode
Negative ions go to the…..
Positive anode
What is oxidation….
Loss of electrons
What is reduction……
Gain of electrons
In a molten electrolysis of sodium chloride, what would go to the cathode and anode
Cathode - sodium
Anode - chloride
In the electrolysis of a solution, what is present
Hydrogen, oxygen and the elements in question
What is produced at the anode
The simplest ion is discharged
What is presented the cathode
A metal will be discarded if it’s less reactive than hydrogen
If it’s more reactive than hydrogen then hydrogen gas will be produced
Copper is less reactive
Sodium is more reactive
What is produced in copper chloride electrolysis
Cathode - copper
Anode - chlorine
What is produced in copper sulfate electrolysis
Cathode - copper
Anode - oxygen
What is produced In sodium sulfate electrolysis
Cathode - hydrogen
Anode - oxygen
What is produced in sodium chloride electrolysis
Cathode - hydrogen
Anode - chlorine
In purifying copper through electrolysis, what is the cathode made of
A thin pure piece of copper and more pure copper is added to it
Why do we have to electrolyse copper
Because although copper is un reactive it isn’t found pure enough to be used in electrical conductors
How is copper obtained from its ore
Reduction by carbon
How does the electrical supply act in the electrolysis of copper
Pulls electrons off of copper atoms at the anode
Offering electrons at the cathode to nearby Cu2+ ions to turn them back into copper atoms
What is at the cathode in electroplating
The object youre going to electroplate
What is at the anode in electroplating
The bar of metal used for plating
What is electroplating
Coating the surface of a metal with another metal using electricity
