WorksheetsELECTROCHEMISTRY
Total questions: 25
Worksheet time: 25mins
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 in fixed position
Electrical conductivity occurs throughout
the whole experiment
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?
oxygen gas is liberated at the copper plate
Magnesium electrode becomes thinner
Colourless solution turns to brown
Electron flows from magnesium to the copper plate
Chemical cells convert
mechanical energy in to electrical energy
potential energy in to electrical energy
electrical energy in to chemical energy
chemical energy in to electrical energy
What is an anode?
It is the electrode where oxidation takes place.
It is the electrode where reduction takes place.
It is an aqueous solution containing an electrode.
It is the salt bridge that connects half-cells.
Electrons always flow from
cathode to anode
anode to cathode
Electrochemistry is
Study of electron in atom
Study of electricity in molecules
The relationship between chemical reactions and electricity
the study of electrons moving from one atom to another
State one functions of salt bridge
to maintain the movement of electron
to allowing electron to flow and complete the circuit
to separate two electrolyte
to allowing movement of ion to complete the circuit
What happens at the positive terminal in a voltaic cell and in an electrolytic cell?
A
B
C
D
What are product produced at positive/negative terminal during electrolysis of molten NaCI?
A
B
C
D
What is the name of the positive terminal in an electrolytic cell?
cathode
anode
cathode: hydrogen
cathode: oxygen
cathode: hydrogen
cathode: oxygen
a
b
c
d
The overall reaction in an electrochemical cell is
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
As the reaction in this cell takes place, the
mass of the Zn electrode decreases
Zn2+concentration remains the same
mass of the Cu electrode decreases
Cu2+ concentration remains the same
