Zadanie 6b
The diagram below shows the battery connected to a charger. Annotate the diagram to show the direction in which electrons flow through the external wires while the battery is being recharged.
- Materiał graficzny
Electrolysis of molten salts
Describe an electrolytic cell with a DC power source, two electrodes and an electrolyte, explain how ions carry the current in the electrolyte and electrons in the wires, and deduce the electrode products and half-equations for the electrolysis of a molten salt.
Tę umiejętność sprawdza 17 zadań wzorowanych na arkuszach IB z lat 2022–2025.
Zadania sprawdzające tę umiejętność: 17 Otwórz w wyszukiwarce z filtrami
Zadanie 37
Molten lead(II) bromide, PbBr2(l), is electrolysed using inert electrodes. Which products form at the electrodes? A. Anode: Br2, cathode: Pb B. Anode: O2, cathode: Pb C. Anode: Pb, cathode: Br2 D. Anode:…
Zadanie 5c
In this electrolytic cell, silver ions, Ag+(aq), are deposited as silver onto cutlery made of a cheaper metal. Complete the table below, using ticks to show which direction each species moves in and where that movement occurs.
- Tabela do uzupełnienia
Zadanie 34
Which statement correctly describes a type of electrochemical cell? A. A secondary cell operates as a voltaic cell when discharging and as an electrolytic cell when it is recharged B. A primary (voltaic) cell converts electrical energy into chemical energy C.…
Zadanie 3c
Sodium metal is manufactured by the electrolysis of molten sodium chloride. (i) Outline why sodium can be produced by electrolysis rather than by reduction with carbon. (ii) State the half-equation for the formation of sodium during the electrolysis.
Zadanie 7c
Molten potassium iodide is electrolysed. Write the half-equation for the reaction at each electrode: the positive electrode (anode) and the negative electrode (cathode).
Zadanie 3b
(i) A dilute aqueous solution of sodium chloride is electrolysed using inert electrodes. Give the half-equation for the process at the anode and the half-equation for the process at the cathode. Use section 19 of the data booklet. (ii) Identify the product at…
Zadanie 3a
A dilute aqueous solution of potassium iodide, KI(aq), is electrolysed using inert graphite electrodes, as shown in the diagram. (i) State the direction in which the electrons move in the external circuit, and the direction in which the positive ions and the…
- Materiał graficzny
Zadanie 3b
Beryllium metal is produced by the electrolysis of beryllium chloride, BeCl2, dissolved in molten sodium chloride. (i) Write the half-equation for the process at the electrode where beryllium metal is produced. (ii) Calculate the atom economy of this…
Zadanie 29
Which row describes an electrolytic cell? A. The anode is positive; the overall reaction is non-spontaneous B. The anode is negative; the overall reaction is spontaneous C. The anode is negative; the overall reaction is non-spontaneous D. The anode is…
Zadanie 29
Which statement describes a voltaic cell? A. It converts electrical energy to chemical energy using a spontaneous redox reaction B. It converts chemical energy to electrical energy using a non-spontaneous redox reaction C. It converts electrical energy to…
Zadanie 31
A steel spoon is to be coated with silver by electrolysis. Which arrangement is correct? A. The spoon is the cathode, a silver rod is the anode and the electrolyte is aqueous AgNO3 B. The spoon is the anode, a silver rod is the cathode and the…
Zadanie 4a
A student electrolysed aqueous silver nitrate between two silver electrodes, as shown. Each electrode was washed, dried and weighed before and after the electrolysis. Suggest why the mass gained by the cathode is a less accurate measure of the amount of silver…
- Materiał graficzny
Zadanie 5b
Aluminium is produced industrially by the electrolysis of aluminium oxide dissolved in molten cryolite, as shown in the diagram. (i) Outline why the molten mixture is considered to be an electrolyte. (ii) Identify the electrode at which aluminium forms and…
- Materiał graficzny
Zadanie 5b
Aluminium is produced by the electrolysis of molten aluminium oxide (in industry dissolved in molten cryolite to lower the operating temperature). A simplified cell is shown in the diagram. (i) Outline why the molten mixture is classified as an electrolyte.…
- Materiał graficzny
Zadanie 30
What are the products at the electrodes in the electrolysis of 1.0 mol dm−3 aqueous copper(II) sulfate using inert electrodes? A. H2(g) at the cathode and O2(g) at the anode B. Cu(s) at the cathode and SO2(g) at the…
Zadanie 3b
Molten lead(II) bromide undergoes electrolysis in an electrolytic cell at 420 °C, using inert electrodes. (i) Deduce the half-equation for the reaction at each electrode. Cathode (negative electrode): Anode (positive electrode): (ii) Deduce the…