In electrolysis, what is the name of the negative electrode?
Electrolyte
Cathode
Anode
In the electrolysis of sodium chloride solution, what is the product at the cathode?
Hydrogen
Sodium
Chlorine
Which of the following is a true statement about the electrolysis of sodium chloride solution?
Hydrogen forms at the positive electrode
Sodium forms at the negative electrode
Chlorine forms at the positive electrode
Which of the options could be used as an electrolyte when purifying copper?
Copper(II) sulfate
Lead(II) nitrate
Distilled water
Which half equation shows what happens at the negative electrode when purifying copper by electrolysis?
Cu2+ + 2e- →Cu
Cu2+ → Cu + 2e-
Cu → Cu2+ + 2e-
Where does oxidation take place during electrolysis? [Higher tier only]
At the anode
At the cathode
In the electrolyte
A solution of copper(II) sulfate is electrolysed with copper electrodes. Which of these statements is true?
Copper is produced at the anode
The cathode increases in mass
The solution becomes paler blue
During electrolysis of water, hydrogen gas is produced at the cathode. What is the half-equation for the reaction on the cathode?
H+ + 1e- → H
H2 → 2H+ + 2e-
2H+ + 2e- → H2
What are the three products formed when brine undergoes electrolysis?
Sodium hydroxide, hydrogen and oxygen
Sodium hydroxide, hydrogen and chlorine
Sodium hydroxide, oxygen and chlorine
Why must electrolytes be molten or in solution?
It makes the electrolyte contain water
It makes the electrolyte contain free-moving electrons
It makes the electrolyte contain free-moving ions