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WorksheetsElectrolysis MC diagnostic 1
Total questions: 10
Worksheet time: 10mins
Why does a compound have to be in a liquid or aqueous state to be electrolysed?
So the ions are free to move
So the electrons are free to move
So the atoms are free to move
So the electrons and ions are free to move
When molten aluminium oxide is electrolysed, what is the half equation at the positive electrode?
Al3+ + 3e- --> Al
4OH- --> O2 + 2H2O + 4e-
O2- --> O2 + 2e-
2O2- --> O2 + 4e-
Copper (II) ions are represented as Cu2+. What does this mean?
Each copper atom has gained 2 electrons
Each copper atom has gained 2 protons
Each copper atom has lost 2 electrons
Copper molecules have lost 2 electrons
Copper (II) ions reduce to copper during the electrolysis of CuCl2(l). What is the half equation?
Cu2+ + 2e --> Cu
Cu2+ - 2e --> Cu
Cu2+ --> Cu + 2e-
Cu2+ + 2e- --> Cu
What is the half equation for oxidation of oxide ions?
O- + e- --> O2
2O2- --> O2 + e-
2O2- --> O2 + 2e-
2O2- --> O2 + 4e-
How are chloride ions represented?
Cl
Cl-
Cl2
Cl+
Chloride ions oxidise to chlorine during the electrolysis of molten CuCl2. What is the half equation?
Cl- + e --> Cl
Cl- --> Cl2 + e-
2Cl- --> Cl2 + 2e-
2Cl- + 2e- --> Cl2
Copper (II) chloride solution electrolyses. What are the products at the electrodes?
Cathode: copper ions
Anode: chloride ions
Cathode: copper
Anode: chloride
Cathode: copper
Anode: chlorine
Positive electrode: copper
Negative electrode: chlorine
Which ions are discharged during the electrolysis of salt water?
Cl-
H+
Chloride ions
Sodium ions
Chlorine
Hydrogen gas
Cl2
H+
Which gas is produced at the positive electrode during the electrolysis of CuSO4(aq)?
Hydroxide
Hydrogen
Oxygen
Sulfur
