Voltaic cells - SL

Last updated 21 days ago

21 questions

Voltaic cells - SL

Last updated 21 days ago

21 questions

In a voltaic cell, the substance that is most easily
oxidised will give up its electrons to the external circuit
and is the anode of the cell.

In a simple voltaic cell made from two metals and solutions of their ions, would the metal higher in
the activity series form the anode or the cathode of the cell?

In the voltaic cell in Figure 20.1, Fe3+ ions are reduced
to Fe2+ ions, and zinc atoms are oxidised to Zn2+ ions.

a What is the purpose of the salt bridge?

b Give equations for the reactions in each half-cell

Cell notation is used as shorthand to describe voltaic
cells, for example:
Cu(s) | Cu2+ (aq) || H+(aq), Cr2O72−(aq), Cr3+ (aq) | Pt(s)

a What is the single vertical line used to represent?

b What is the double vertical line used to represent?

Give the cell diagram for the voltaic cell that has the following overall equations:
a Ag+(aq) + Cu(s) → Ag(s) + Cu2+ (aq)
b Cu(s) + 2NO3−(aq) + 4H+(aq) → Cu2+ (aq) +2NO2(g) + 2H2O(l)
c 5IO4−(aq) + 2Mn2+(aq) + 3H2O(l) → 5IO3−(aq) +2MnO4−(aq) + 6H+(aq)

Use the activity series in the IB data book to put the following voltaic cells in increasing order of the voltage they produce. Assume that any differences in conditions, such as concentration and temperature, can be ignored.
A Zn2+ + Mg → Mg2+ + Zn
B 2Cr3+ + 3Zn → 2Cr + 3Zn2+
C 3Mg2+ + 2Cr → 2Cr3+ + 3Mg

a Rechargeable batteries can be both charged and discharged. What do these two terms mean?

When the engine of a vehicle containing a lead–acid battery is running, the lead–acid battery is charged up by the following reactions:
anode: PbSO4(s) + 2H2O(l) → PbO2(s) + 2e−+ 4H+
(aq) + SO42− (aq)
cathode: PbSO4(s) + 2e− → Pb(s) + SO42− (aq)
Lead(II) sulfate occurs as an insoluble coating on the surface of both metal electrodes.

Voltaic cells - SL

Voltaic cells - SL

In a simple voltaic cell made from two metals and solutions of their ions, would the metal higher inthe activity series form the anode or the cathode of the cell?

a What is the purpose of the salt bridge?

b Give equations for the reactions in each half-cell

a What is the single vertical line used to represent?

b What is the double vertical line used to represent?

Give the cell diagram for the voltaic cell that has the following overall equations:a Ag+(aq) + Cu(s) → Ag(s) + Cu2+ (aq)b Cu(s) + 2NO3−(aq) + 4H+(aq) → Cu2+ (aq) +2NO2(g) + 2H2O(l)c 5IO4−(aq) + 2Mn2+(aq) + 3H2O(l) → 5IO3−(aq) +2MnO4−(aq) + 6H+(aq)

a Rechargeable batteries can be both charged and discharged. What do these two terms mean?

a Give the equations when the lead–acid battery is being discharged.

b Using the equations, identify a suitable electrolyte in a lead–acid battery.

In a simple voltaic cell made from two metals and solutions of their ions, would the metal higher inthe activity series form the anode or the cathode of the cell?

In a voltaic cell, in which direction do the electronsflow in the external circuit?

a What is the purpose of the salt bridge?

b Give equations for the reactions in each half-cell

c What changes would be observed in each beaker?

.Copy and Label the diagram to show the following:● the direction of electron flow through the external circuit● the anode● the cathode● the positive electrode● the negative electrode● the direction of ion flow in the salt bridge

a What is the single vertical line used to represent?

b What is the double vertical line used to represent?

c What are the two electrodes made from in thiscell?

d Give the half-equations occurring at eachelectrode.

e Give the overall equation for the cell.

Give the cell diagram for the voltaic cell that has the following overall equations:a Ag+(aq) + Cu(s) → Ag(s) + Cu2+ (aq)b Cu(s) + 2NO3−(aq) + 4H+(aq) → Cu2+ (aq) +2NO2(g) + 2H2O(l)c 5IO4−(aq) + 2Mn2+(aq) + 3H2O(l) → 5IO3−(aq) +2MnO4−(aq) + 6H+(aq)

a Rechargeable batteries can be both charged and discharged. What do these two terms mean?

b In a rechargeable battery, does oxidation occur at the anode or cathode when the cell is being discharged?

c In a rechargeable battery, does oxidation occur at the anode or cathode when the cell is being charged?

d When a rechargeable battery is being discharged, is the anode negative or positive?

e When a rechargeable battery is being charged, is the anode negative or positive?

f Electrons flow in the external part of an electrochemical cell. What type of particle moves through the electrolyte of a cell?

a Give the equations when the lead–acid battery is being discharged.

b Using the equations, identify a suitable electrolyte in a lead–acid battery.

In a voltaic cell, in which direction do the electronsflow in the external circuit?

c What changes would be observed in each beaker?

.Copy and Label the diagram to show the following:● the direction of electron flow through the external circuit● the anode● the cathode● the positive electrode● the negative electrode● the direction of ion flow in the salt bridge

c What are the two electrodes made from in thiscell?

d Give the half-equations occurring at eachelectrode.

e Give the overall equation for the cell.

b In a rechargeable battery, does oxidation occur at the anode or cathode when the cell is being discharged?

c In a rechargeable battery, does oxidation occur at the anode or cathode when the cell is being charged?

d When a rechargeable battery is being discharged, is the anode negative or positive?

e When a rechargeable battery is being charged, is the anode negative or positive?

f Electrons flow in the external part of an electrochemical cell. What type of particle moves through the electrolyte of a cell?

In a simple voltaic cell made from two metals and solutions of their ions, would the metal higher in
the activity series form the anode or the cathode of the cell?

Give the cell diagram for the voltaic cell that has the following overall equations:
a Ag+(aq) + Cu(s) → Ag(s) + Cu2+ (aq)
b Cu(s) + 2NO3−(aq) + 4H+(aq) → Cu2+ (aq) +2NO2(g) + 2H2O(l)
c 5IO4−(aq) + 2Mn2+(aq) + 3H2O(l) → 5IO3−(aq) +2MnO4−(aq) + 6H+(aq)

In a simple voltaic cell made from two metals and solutions of their ions, would the metal higher in
the activity series form the anode or the cathode of the cell?

In a voltaic cell, in which direction do the electrons
flow in the external circuit?

.Copy and Label the diagram to show the following:
● the direction of electron flow through the external circuit
● the anode
● the cathode
● the positive electrode
● the negative electrode
● the direction of ion flow in the salt bridge

c What are the two electrodes made from in this
cell?

d Give the half-equations occurring at each
electrode.

Give the cell diagram for the voltaic cell that has the following overall equations:
a Ag+(aq) + Cu(s) → Ag(s) + Cu2+ (aq)
b Cu(s) + 2NO3−(aq) + 4H+(aq) → Cu2+ (aq) +2NO2(g) + 2H2O(l)
c 5IO4−(aq) + 2Mn2+(aq) + 3H2O(l) → 5IO3−(aq) +2MnO4−(aq) + 6H+(aq)

In a voltaic cell, in which direction do the electrons
flow in the external circuit?

.Copy and Label the diagram to show the following:
● the direction of electron flow through the external circuit
● the anode
● the cathode
● the positive electrode
● the negative electrode
● the direction of ion flow in the salt bridge

c What are the two electrodes made from in this
cell?

d Give the half-equations occurring at each
electrode.