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Electrolysis involves using electricity to break down electrolytes to form elements. The products of electrolysis can be predicted for a given electrolyte. Copper can be purified using electrolysis.
What name is given to the process of splitting up an ionic compound using a direct current supply?
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
What names are given to the two electrodes in electrolysis?
Anode (positive) and cathode (negative)
Anode (negative) and cathode (positive)
Anion (positive) and cation (negative)
What products are formed when molten sodium chloride is electrolysed?
Hydrogen and chlorine
Sodium and chlorine
Sodium and oxygen
Why does water have a low electrical conductivity?
It contains free-moving electrons
It contains small numbers of ions
It is an ionic compound
When nickel chloride solution is electrolysed, hydrogen is produced at the cathode. What can be deduced from this observation?
Nickel is more reactive than hydrogen
Oxygen will be produced at the anode
The solution is concentrated
When nickel chloride solution is electrolysed, chlorine is produced at the anode. What can be deduced from this observation?
Chloride ions are positively charged
Chlorine is more reactive than nickel
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
Where does oxidation take place during electrolysis? - Higher
At the anode
At the cathode
In the electrolyte
Which is the correct equation for the formation of chlorine gas at the anode during the electrolysis of concentrated sodium chloride solution? - Higher
2Cl- + 2e- → Cl2
Cl- → Cl + e-
2Cl- → Cl2 + 2e-