Electrochemistry

Question 3:Rohani found a rusted iron nail. Using your knowledge of electrolysis, describe a simple way to prevent the rusting of the iron nail. Answer:The rusting of the iron nail can be avoided by electroplating the iron nail with copper through electrolysis under the following conditions: • iron nail is made the cathode • pure … Read more

Question 2:Figure 2 shows an apparatus set-up to study the electrolysis of aqueous sodium nitrate solution, NaNO3, using carbon electrodes labelled P and Q. (a)(i) State all the cations present in the electrolyte. (a)(ii) State all the anions present in the electrolyte. (b) Which electrode acts as the anode? (c) Name the ion chosen to … Read more

Question 1:Figure 1 shows an apparatus set-up to study the electrolysis of an aqueous copper(II) sulphate solution, CuSO4 using different electrodes as shown in electrolytic cell P and electrolytic cell Q. (a) State the meaning of electrolysis. (b) State all the ions present in the aqueous copper(II) sulphate solution. (c) Name the ions discharged at … Read more

Question 1:What is a simple chemical cell? Answer:A simple chemical cell is a device that can convert chemical energy into electrical energy. Question 2:Draw and label a simple chemical cell. Answer: Question 3:How does the position of an ion in the electrochemical series determine the positive terminal and the negative terminal in a simple chemical … Read more

Question 1:Draw and label the structures of an electrolytic cell. Answer: Question 2:Describe the movement of ions to electrodes during electrolysis. Answer:During electrolysis, positive ions (cations) move to the cathode (negative electrode) and negative ions (anions) move to the anode (positive electrode). Question 3:Give four examples of applications of electrolysis in industries. Answer:Extraction of metal, … Read more

Question 1:Diagram 1 shows the setting up of apparatus in an experiment.(a) Name the process in Diagram 1. [1 mark](b)(i) Name metal Q. [1 mark]  (ii) What happens to metal Q during the process in Diagram 1? [1 mark](c) Which metal functions as the cathode? [1 mark](d)(i) What will happen to the iron key at … Read more

Electrolysis of Molten lead (II) bromide 1.   Figure above shows the apparatus set up for electrolysis of molten lead (II) bromide. 2.   Lead (II) bromide powder in a crucible is heated. 3.   The electrolysis process start when le an (II) bromide start melting. 4.   At the Cathode When electricity is flowing, … Read more

Electrolysis of Copper (II) Chloride Solution 1. Electrolysis of copper (II) chloride solution. (a)  Copper (II) ion with positive charge will attract to cathode to discharge as a copper. (b)  Chloride ion will attract to anode to discharge as a chlorine gas. (c)  At anode, chloride ions lose electrons. Greenish gas which can bleach the … Read more

  Electrolysis 1. Electrolysis is a process where a compound is separated into its constituent elements when electric current passes through an electrolyte.   2. In electrolysis, energy is changed as shown below: Electrical energy → chemical energy 3. The apparatus used in an electrolytic cell consists of a dry cell or battery, an electrolyte and … Read more