Font size
WorksheetsW1 Review
Total questions: 17
Worksheet time: 1hrs 25mins
Which of these is true about an oxidising agent?
an oxidising agent gets oxidised
an oxidising agent loses electrons
an oxidising agent gains electrons
Which of the following statements regarding redox reactions is false?
Reduction is the gain of electrons.
You may have reduction without oxidation.
Oxidation is the loss of electrons.
Redox reactions involve the transfer of electrons.
During a redox reaction:
the oxidation state increases for the species being oxidised.
the oxidation state becomes more negative for the species being oxidised.
there is no change in the oxidation state of the species being reduced.
the oxidation state becomes more positive for the species being reduced.
Which substance is being oxidised in the reaction shown by the following equation?
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
Zn
HCl
ZnCl2
H2
True or false?
Mg2+ + 2e– --> Mg is an oxidation half-equation.
True
False
Galvanic cells transform:
electrical energy into chemical potential energy.
chemical potential energy into electrical energy.
electrical energy into kinetic energy.
elastic potential energy into chemical potential energy.
A salt bridge must fulfil all of the following except:
contains ions.
be an electrolyte.
connect the two half-cells.
react with the half-cells.
Which of the following statements about electrochemical cells is true?
Oxidation occurs at the anode.
Oxidation occurs at the cathode.
Reduction occurs at the anode.
Reduction occurs in the salt bridge.
Which of the following is not an electrochemical cell?
electrolytic cell
battery
galvanic cell
stem cell
Which statement about the following reactivity series is true?
K > Na > Ca > Mg > Zn > Fe > Cu > Ag
Sodium is more likely to be oxidised than zinc.
Magnesium is more likely to be reduced than copper.
Iron will react in a solution of magnesium nitrate.
There will be no reaction if magnesium is placed in sodium nitrate.
Which of the following is the correct label for the galvanic cell shown?
W is the external wire.
Y is the voltmeter.
X is the cathode.
Z is the salt bridge.
In a galvanic cell it is important that the half-cells are separated because:
oxidation and reduction are two separate reactions.
oxidation and reduction cannot happen at the same time.
this allows ions to flow through the salt bridge.
this allows electrons to flow through the external wire.
The galvanic cell shown is allowed to run by closing the switch. What observations will be made?
The copper electrode will get smaller.
The colour of the magnesium electrolyte will get darker.
The colour of the copper electrolyte will get paler.
The magnesium electrode will get bigger.
Which of the following statements about the galvanic cell shown is false?
Electrons flow from the iron half-cell to the hydrogen half-cell.
The mass of the iron electrode will increase.
The potassium ions migrate towards the hydrogen half-cell.
Hydrogen gas is produced.
The purpose of the salt bridge in a galvanic cell is to allow the flow of:
electrons and therefore complete the circuit.
ions and therefore complete the circuit.
ions and therefore open the circuit.
electrons and therefore open the circuit.
In a galvanic cell, reduction occurs:
in the external wire.
at the anode.
in the salt bridge.
at the cathode.
