WorksheetsELECTROCHEMISTRY
Total questions: 10
Worksheet time: 22mins
Diagram shows an electrolysis cell.
Which of the substances cause the bulb to light up when electricity passes through it?
Ethanol
Dilute ethanoic acid
Solid lead(II) bromide
Tetrachloromethane
What are the products formed at the anode and the cathode during the electrolysis of molten magnesium oxide using carbon electrodes?
Anode: Oxygen
Cathode: Magnesium
Anode: Magnesium
Cathode: Oxygen
Anode: Hydrogen
Cathode: Oxygen
Anode: Oxygen
Cathode: Hydrogen
Table shows information about three chemical cells.
What is the possible potential difference of the chemical cell when metal Z is paired with W ?
0.3 V
1.2 V
1.5 V
2.1 V
Diagram shows the electrolysis of concentrated copper(II) chloride solution using carbon as electrodes.
Which of the followings is the correct half equations represents the reactions at the anode?
4OH- → 2H2O + O2 + 4e
2Cl- → Cl2 + 2e
Cu → Cu2+ + 2e
Cu2+ + 2e → Cu
Diagram
shows the apparatus set-up for the electrolysis of 1.0 mol dm -3 sodium chloride solution using carbon electrodes.Which of the following are the observation for the electrolysis process shown in Diagram?
Grey solid deposited on electrode B
Colourless gas is released at electrode B
Carbon electrode A becomes thinner
Greenish yellow gas is released at electrode A
Molten X is electrolysed using carbon electrodes. After 10 minutes, a brown solid is deposited on the cathode and a brown gas is released at the anode. What is molten X?
Lead(II) chloride
Lead(II) bromide
Copper(II) chloride
Copper(II) bromide
Table shows the results of the electrolysis of molten lead (II) bromide.
The ammeter only shows reading when solid lead (II) bromide, PbBr2 is completely melted. Which of the following explains the observation?
Bromide ions receive electrons to form bromine gas
Lead (II) ions donate electrons to produce lead metal
In the solid state, bromide and lead (II) ions are held in a lattice
Electrical conductivity occurs throughout
the whole experiment
Which of the following reactions shows that copper is oxidized?
Reaction of magnesium with copper (II) oxide
Reaction of copper with silver nitrate solution
Electrolysis of copper (II) nitrate solution by using carbon nitrate
Voltaic cell with copper and magnesium electrodes in dilute sulphuric acid
Diagram shows an electrolysis of dilute sulphuric acid.
What could be gas X and the half-equation occurring at the cathode?
Carbon dioxide, C + O2 → CO2
Hydrogen, 2H+ + 2e- → H2
Oxygen, 4OH- → H2O + O2 + 4e-
Sulphur dioxide, SO4 2- → SO2 + O2 + 2e-
Diagram shows an apparatus set-up for a chemical cell. What can you observed from this experiment?
Hydrogen gas is liberated at the copper plate
Magnesium electrode becomes thinner
Colourless solution turns to brown
Electron flows from magnesium to the copper plate
